openwrt/staging/blogic.git
7 years agodrivers, char: convert vma_data.refcnt from atomic_t to refcount_t
Elena Reshetova [Mon, 6 Mar 2017 14:20:50 +0000 (16:20 +0200)]
drivers, char: convert vma_data.refcnt from atomic_t to refcount_t

refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.

Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agodrivers/misc: Aspeed LPC control fix compile error and warning
Cyril Bur [Wed, 22 Mar 2017 03:13:28 +0000 (14:13 +1100)]
drivers/misc: Aspeed LPC control fix compile error and warning

pgprot_dmachoerent() is not defined on every architecture. Having
COMPILE_TEST set for the driver causes it to be compiled on
architectures which do not have pgprot_dmachoerent():
    drivers/misc/aspeed-lpc-ctrl.c: In function 'aspeed_lpc_ctrl_mmap':
    drivers/misc/aspeed-lpc-ctrl.c:51:9: error: implicit declaration of
        function 'pgprot_dmacoherent' [-Werror=implicit-function-declaration]
        prot = pgprot_dmacoherent(prot);

There are two possible solutions:
    1. Remove COMPILE_TEST to ensure the driver is only compiled on ARM
    2. Use pgprot_noncached() instead of pgprot_dmachoerent()

The first option results in less compile testing of the LPC control
driver which is undesirable.
The second option uses a function that is declared on all architectures
and therefore should always build. Currently there is no practical
difference between pgprot_noncached() and pgprot_dmachoerent() for the
aspeed chips that this driver is compatible with. The reason for
pgprot_dmachoerent() was that there may be chips made at some point in
the future that could include hardware that pgprot_dmachoerent() could
optimise for. As none of this hardware has even been announced there
isn't really a need for pgprot_dmachoerent().

Using pgprot_noncached() is completely correct and optimal for all
existing hardware on which the LPC control driver will run.

This commit also addresses that phys_addr_t should be printed using %pap
rather than %x:
    In file included from include/linux/miscdevice.h:6:0,
                     from drivers/misc/aspeed-lpc-ctrl.c:11:
    drivers/misc/aspeed-lpc-ctrl.c: In function 'aspeed_lpc_ctrl_probe':
    drivers/misc/aspeed-lpc-ctrl.c:232:17: warning: format '%x' expects
        argument of type 'unsigned int', but argument 3 has type 'phys_addr_t
        {aka long long unsigned int}' [-Wformat=]
        dev_info(dev, "Loaded at 0x%08x (0x%08x)\n",

Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agoscsi: utilize new cdev_device_add helper function
Logan Gunthorpe [Fri, 17 Mar 2017 18:48:22 +0000 (12:48 -0600)]
scsi: utilize new cdev_device_add helper function

This driver did not set kobj.parent so it likely suffered from
a potential use after free race if the user unregistered the
device while it was in use.

This was not so straightforward a conversion but I think this patch
cleans up its probe's error path significantly.

This patch adds device_initialize, which is required for
cdev_device_add. Then it switches to put_device instead of kfree as
recommended by device_initialize's documentation. This removes a lot
from the error path which was already in __remove.
A couple things needed to be re-ordered to be entirely correct, though.
ida_remove is also moved out of __remove and into unregister to
simplify things and follow the pattern other devices are using.

This also drop an extra unnecessary get_device/put_device in the code.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agortc: utilize new cdev_device_add helper function
Logan Gunthorpe [Fri, 17 Mar 2017 18:48:21 +0000 (12:48 -0600)]
rtc: utilize new cdev_device_add helper function

Mostly straightforward, but we had to remove the rtc_dev_add/del_device
functions as they split up the cdev_add and the device_add.

Doing this also revealed that there was likely another subtle bug:
seeing cdev_add was done after device_register, the cdev probably
was not ready before device_add when the uevent occurs. This would
race with userspace, if it tried to use the device directly after
the uevent. This is fixed just by using the new helper function.

Another weird thing is this driver would, in some error cases, call
cdev_add() without calling cdev_init. This patchset corrects this
by avoiding calling cdev_add if the devt is not set.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agorapidio: utilize new cdev_device_add helper function
Logan Gunthorpe [Fri, 17 Mar 2017 18:48:20 +0000 (12:48 -0600)]
rapidio: utilize new cdev_device_add helper function

This driver did not originally set kobj.parent so it likely had
potential a use after free bug which this patch fixes.

We convert from device_register to device_initialize/cdev_device_add.
While we are at it we use put_device instead of kfree (as recommended
by the device_initialize documentation). We also remove an unnecessary
extra get_device from the code.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agomtd: utilize new cdev_device_add helper function
Logan Gunthorpe [Fri, 17 Mar 2017 18:48:19 +0000 (12:48 -0600)]
mtd: utilize new cdev_device_add helper function

This is not as straightforward a conversion as the others
in this series. These drivers did not originally make use of
kobj.parent so they likely suffered from a use after free bug if
someone unregistered the devices while they are being used.

In order to make the conversions, switch from device_register
to device_initialize / cdev_device_add.

In build.c, this patch unwinds a complicated mess of extra
get_device/put_devices and reference tracking by moving device_initialize
early in the attach process. Then it always uses put_device and instead of
using device_unregister and extra get_devices everywhere we just use
cdev_device_del and one put_device once everything is completely done.
This simplifies things dramatically and makes it easier to reason about.

In vmt.c, the patch pushes device initialization up to the beginning of the
device creation and then that function only needs to use put_device
in the error path which simplifies things a good deal.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agomedia: utilize new cdev_device_add helper function
Logan Gunthorpe [Fri, 17 Mar 2017 18:48:18 +0000 (12:48 -0600)]
media: utilize new cdev_device_add helper function

Replace the open coded registration of the cdev and dev with the
new device_add_cdev() helper. The helper replaces a common pattern by
taking the proper reference against the parent device and adding both
the cdev and the device.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agoiio:core: utilize new cdev_device_add helper function
Logan Gunthorpe [Fri, 17 Mar 2017 18:48:17 +0000 (12:48 -0600)]
iio:core: utilize new cdev_device_add helper function

Replace the open coded registration of the cdev and dev with the
new device_add_cdev() helper. The helper replaces a common pattern by
taking the proper reference against the parent device and adding both
the cdev and the device.

In doing so we have to remove a guard statement from cdev_del,
but this doesn't appear to be required in any way.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agoinfiniband: utilize the new cdev_set_parent function
Logan Gunthorpe [Fri, 17 Mar 2017 18:48:16 +0000 (12:48 -0600)]
infiniband: utilize the new cdev_set_parent function

This replaces the suspect looking cdev.kobj.parent lines with the
equivalent cdev_set_parent function. This is a straightforward change
that's largely cosmetic but it does push the kobj.parent ownership
into char_dev.c where it belongs.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agoIB/ucm: utilize new cdev_device_add helper function
Jason Gunthorpe [Fri, 17 Mar 2017 18:48:15 +0000 (12:48 -0600)]
IB/ucm: utilize new cdev_device_add helper function

The use after free is not triggerable here because the cdev holds
the module lock and the only device_unregister is only triggered by
module unload, however make the change for consistency.

To make this work the cdev_del needs to move out of the struct device
release function.

This cleans up the error path significantly and thus also fixes a minor
bug where the devnum would not be released if cdev_add failed.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agoplatform/chrome: cros_ec_dev - utilize new cdev_device_add helper function
Logan Gunthorpe [Fri, 17 Mar 2017 18:48:14 +0000 (12:48 -0600)]
platform/chrome: cros_ec_dev - utilize new cdev_device_add helper function

Replace the open coded registration of the cdev and dev with the
new device_add_cdev() helper. The helper replaces a common pattern by
taking the proper reference against the parent device and adding both
the cdev and the device.

At the same time we cleanup the error path through device_probe
function: we use put_device instead of kfree directly as recommended
by the device_initialize documentation.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agotpm-chip: utilize new cdev_device_add helper function
Logan Gunthorpe [Fri, 17 Mar 2017 18:48:13 +0000 (12:48 -0600)]
tpm-chip: utilize new cdev_device_add helper function

Replace the open coded registration of the cdev and dev with the
new device_add_cdev() helper. The helper replaces a common pattern by
taking the proper reference against the parent device and adding both
the cdev and the device.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agogpiolib: utilize new cdev_device_add helper function
Logan Gunthorpe [Fri, 17 Mar 2017 18:48:12 +0000 (12:48 -0600)]
gpiolib: utilize new cdev_device_add helper function

Replace the open coded registration of the cdev and dev with the
new device_add_cdev() helper. The helper replaces a common pattern by
taking the proper reference against the parent device and adding both
the cdev and the device.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agoinput: utilize new cdev_device_add helper function
Logan Gunthorpe [Fri, 17 Mar 2017 18:48:11 +0000 (12:48 -0600)]
input: utilize new cdev_device_add helper function

Replace the open coded registration of the cdev and dev with the
new device_add_cdev() helper in evdev, joydev and mousedev. The helper
replaces a common pattern by taking the proper reference against the
parent device and adding both the cdev and the device.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agodevice-dax: utilize new cdev_device_add helper function
Logan Gunthorpe [Fri, 17 Mar 2017 18:48:10 +0000 (12:48 -0600)]
device-dax: utilize new cdev_device_add helper function

Replace the open coded registration of the cdev and dev with the
new device_add_cdev() helper. The helper replaces a common pattern by
taking the proper reference against the parent device and adding both
the cdev and the device.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agodevice-dax: fix cdev leak
Dan Williams [Fri, 17 Mar 2017 18:48:09 +0000 (12:48 -0600)]
device-dax: fix cdev leak

If device_add() fails, cleanup the cdev. Otherwise, we leak a kobj_map()
with a stale device number.

As Jason points out, there is a small possibility that userspace has
opened and mapped the device in the time between cdev_add() and the
device_add() failure. We need a new kill_dax_dev() helper to invalidate
any established mappings.

Fixes: ba09c01d2fa8 ("dax: convert to the cdev api")
Cc: <stable@vger.kernel.org>
Reported-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agochardev: add helper function to register char devs with a struct device
Logan Gunthorpe [Fri, 17 Mar 2017 18:48:08 +0000 (12:48 -0600)]
chardev: add helper function to register char devs with a struct device

Credit for this patch goes is shared with Dan Williams [1]. I've
taken things one step further to make the helper function more
useful and clean up calling code.

There's a common pattern in the kernel whereby a struct cdev is placed
in a structure along side a struct device which manages the life-cycle
of both. In the naive approach, the reference counting is broken and
the struct device can free everything before the chardev code
is entirely released.

Many developers have solved this problem by linking the internal kobjs
in this fashion:

cdev.kobj.parent = &parent_dev.kobj;

The cdev code explicitly gets and puts a reference to it's kobj parent.
So this seems like it was intended to be used this way. Dmitrty Torokhov
first put this in place in 2012 with this commit:

2f0157f char_dev: pin parent kobject

and the first instance of the fix was then done in the input subsystem
in the following commit:

4a215aa Input: fix use-after-free introduced with dynamic minor changes

Subsequently over the years, however, this issue seems to have tripped
up multiple developers independently. For example, see these commits:

0d5b7da iio: Prevent race between IIO chardev opening and IIO device
(by Lars-Peter Clausen in 2013)

ba0ef85 tpm: Fix initialization of the cdev
(by Jason Gunthorpe in 2015)

5b28dde [media] media: fix use-after-free in cdev_put() when app exits
after driver unbind
(by Shauh Khan in 2016)

This technique is similarly done in at least 15 places within the kernel
and probably should have been done so in another, at least, 5 places.
The kobj line also looks very suspect in that one would not expect
drivers to have to mess with kobject internals in this way.
Even highly experienced kernel developers can be surprised by this
code, as seen in [2].

To help alleviate this situation, and hopefully prevent future
wasted effort on this problem, this patch introduces a helper function
to register a char device along with its parent struct device.
This creates a more regular API for tying a char device to its parent
without the developer having to set members in the underlying kobject.

This patch introduce cdev_device_add and cdev_device_del which
replaces a common pattern including setting the kobj parent, calling
cdev_add and then calling device_add. It also introduces cdev_set_parent
for the few cases that set the kobject parent without using device_add.

[1] https://lkml.org/lkml/2017/2/13/700
[2] https://lkml.org/lkml/2017/2/10/370

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agoauxdisplay: Add HD44780 Character LCD support
Geert Uytterhoeven [Fri, 10 Mar 2017 14:15:21 +0000 (15:15 +0100)]
auxdisplay: Add HD44780 Character LCD support

The Hitachi HD44780 Character LCD Controller is commonly used on
character LCDs that can display one or more lines of text.

This driver supports character LCDs connected to GPIOs, using either a
4-bit or 8-bit data bus, and provides access through the charlcd core
and /dev/lcd.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agodt-bindings: auxdisplay: Add bindings for Hitachi HD44780
Geert Uytterhoeven [Fri, 10 Mar 2017 14:15:20 +0000 (15:15 +0100)]
dt-bindings: auxdisplay: Add bindings for Hitachi HD44780

Add DT bindings for an Hitachi HD44780 Character LCD Controller where
its M6800 bus interface is connected to GPIOs.

Memory-mapped configurations are not yet supported.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agoauxdisplay: charlcd: Add support for displays with more than two lines
Geert Uytterhoeven [Fri, 10 Mar 2017 14:15:19 +0000 (15:15 +0100)]
auxdisplay: charlcd: Add support for displays with more than two lines

On displays with more than two lines, the additional lines are stored in
the buffers used for the first two lines, but beyond the visible parts.
Adjust the DDRAM address calculation to cater for this.

When clearing the display, avoid writing more spaces than the actual
size of the physical buffer.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agoauxdisplay: charlcd: Add support for 4-bit interfaces
Geert Uytterhoeven [Fri, 10 Mar 2017 14:15:18 +0000 (15:15 +0100)]
auxdisplay: charlcd: Add support for 4-bit interfaces

In 4-bit mode, 8-bit commands and data are written using two raw writes
to the data interface: high nibble first, low nibble last.  This must be
handled by the low-level driver.

However, as we don't know in which mode (4-bit or 8-bit) nor 4-bit phase
the LCD was left, initialization must always be handled using raw
writes, and needs to configure the LCD for 8-bit mode first.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agoauxdisplay: charlcd: Extract character LCD core from misc/panel
Geert Uytterhoeven [Fri, 10 Mar 2017 14:15:17 +0000 (15:15 +0100)]
auxdisplay: charlcd: Extract character LCD core from misc/panel

Extract the character LCD core from the Parallel port LCD/Keypad Panel
driver in the misc subsystem, and convert it into a subdriver in the
auxdisplay subsystem.  This allows the character LCD core to be used by
other drivers later.

Compilation is controlled by its own Kconfig symbol CHARLCD, which is to
be selected by its users, but can be enabled manually for
compile-testing.

All functions changed their prefix from "lcd_" to "charlcd_", and gained
a "struct charlcd *" parameter to operate on a specific instance.
While the driver API thus is ready to support multiple instances, the
current limitation of a single display (/dev/lcd has a single misc minor
assigned) is retained.

No functional changes intended.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agodrivers/char: Convert remaining use of pr_warning to pr_warn
Joe Perches [Fri, 17 Feb 2017 07:11:26 +0000 (23:11 -0800)]
drivers/char: Convert remaining use of pr_warning to pr_warn

To enable eventual removal of pr_warning

This makes pr_warn use consistent for drivers/char

Prior to this patch, there were 1 use of pr_warning and
40 uses of pr_warn in drivers/char

Signed-off-by: Joe Perches <joe@perches.com>
Reviewed-by: Amit Shah <amit@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agow1: w1_ds2760.h: fix defines indentation
Mariusz Bialonczyk [Thu, 23 Feb 2017 06:38:45 +0000 (07:38 +0100)]
w1: w1_ds2760.h: fix defines indentation

Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agow1: add documentation for w1_ds2438
Mariusz Bialonczyk [Thu, 23 Feb 2017 06:38:44 +0000 (07:38 +0100)]
w1: add documentation for w1_ds2438

Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agow1: add support for DS2438 Smart Battery Monitor
Mariusz Bialonczyk [Thu, 23 Feb 2017 06:38:43 +0000 (07:38 +0100)]
w1: add support for DS2438 Smart Battery Monitor

Detailed information about support and provided sysfs files
in my next commit which creates a documentation file:
Documentation/w1/slaves/w1_ds2438

Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agow1: add missing DS2413 documentation
Mariusz Bialonczyk [Thu, 23 Feb 2017 06:38:42 +0000 (07:38 +0100)]
w1: add missing DS2413 documentation

Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agopps: fix padding issue with PPS_FETCH for ioctl_compat
Matt Ranostay [Fri, 10 Mar 2017 23:19:45 +0000 (15:19 -0800)]
pps: fix padding issue with PPS_FETCH for ioctl_compat

Issue is that x86 32-bit aligns to 4-bytes instead of 8-bytes
so this patchset works around the issue and corrects the data
returned in pps_fdata_compat.

Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agopps: add ioctl_compat function to correct ioctl definitions
Matt Ranostay [Fri, 10 Mar 2017 23:19:44 +0000 (15:19 -0800)]
pps: add ioctl_compat function to correct ioctl definitions

ioctl definitions use the pointer size of the architecture which
is fine when userspace and kernel are the same bitsize. This
patchset workarounds an issue with mixed bitsize kernel + userspace
by rewriting the cmd to the kernelspace architecture pointer size.

Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agodocs: Update VME documentation to include kerneldoc comments
Martyn Welch [Sat, 4 Mar 2017 00:34:30 +0000 (00:34 +0000)]
docs: Update VME documentation to include kerneldoc comments

Update VME documentation given that kerneldoc comments are now provided.
Add "VME API" section to VME RST to pull in kerneldoc comments.

Signed-off-by: Martyn Welch <martyn.welch@collabora.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agodocs: Add kernel-doc comments to VME driver API
Martyn Welch [Sat, 4 Mar 2017 00:34:29 +0000 (00:34 +0000)]
docs: Add kernel-doc comments to VME driver API

Add kernel-doc comments to the VME driver API and structures. This
documentation will be integrated into the RST documentation in a later
patch.

Signed-off-by: Martyn Welch <martyn.welch@collabora.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agohpet: Make cmd parameter of hpet_ioctl_common() unsigned
Matthias Kaehlcke [Mon, 13 Mar 2017 18:57:25 +0000 (11:57 -0700)]
hpet: Make cmd parameter of hpet_ioctl_common() unsigned

The value passed by the two callers of the function is unsigned anyway.

Making the parameter unsigned fixes the following warning when building
with clang:

drivers/char/hpet.c:588:7: error: overflow converting case value to switch condition type (2149083139 to 18446744071563667459) [-Werror,-Wswitch]
        case HPET_INFO:
             ^
include/uapi/linux/hpet.h:18:19: note: expanded from macro 'HPET_INFO'
                        ^
include/uapi/asm-generic/ioctl.h:77:28: note: expanded from macro '_IOR'
                                ^
include/uapi/asm-generic/ioctl.h:66:2: note: expanded from macro '_IOC'
        (((dir)  << _IOC_DIRSHIFT) | \

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agodrivers/misc: Add Aspeed LPC control driver
Cyril Bur [Fri, 17 Feb 2017 03:28:49 +0000 (14:28 +1100)]
drivers/misc: Add Aspeed LPC control driver

In order to manage server systems, there is typically another processor
known as a BMC (Baseboard Management Controller) which is responsible
for powering the server and other various elements, sometimes fans,
often the system flash.

The Aspeed BMC family which is what is used on OpenPOWER machines and a
number of x86 as well is typically connected to the host via an LPC
(Low Pin Count) bus (among others).

The LPC bus is an ISA bus on steroids. It's generally used by the
BMC chip to provide the host with access to the system flash (via MEM/FW
cycles) that contains the BIOS or other host firmware along with a
number of SuperIO-style IOs (via IO space) such as UARTs, IPMI
controllers.

On the BMC chip side, this is all configured via a bunch of registers
whose content is related to a given policy of what devices are exposed
at a per system level, which is system/vendor specific, so we don't want
to bolt that into the BMC kernel. This started with a need to provide
something nicer than /dev/mem for user space to configure these things.

One important aspect of the configuration is how the MEM/FW space is
exposed to the host (ie, the x86 or POWER). Some registers in that
bridge can define a window remapping all or portion of the LPC MEM/FW
space to a portion of the BMC internal bus, with no specific limits
imposed in HW.

I think it makes sense to ensure that this window is configured by a
kernel driver that can apply some serious sanity checks on what it is
configured to map.

In practice, user space wants to control this by flipping the mapping
between essentially two types of portions of the BMC address space:

   - The flash space. This is a region of the BMC MMIO space that
more/less directly maps the system flash (at least for reads, writes
are somewhat more complicated).

   - One (or more) reserved area(s) of the BMC physical memory.

The latter is needed for a number of things, such as avoiding letting
the host manipulate the innards of the BMC flash controller via some
evil backdoor, we want to do flash updates by routing the window to a
portion of memory (under control of a mailbox protocol via some
separate set of registers) which the host can use to write new data in
bulk and then request the BMC to flash it. There are other uses, such
as allowing the host to boot from an in-memory flash image rather than
the one in flash (very handy for continuous integration and test, the
BMC can just download new images).

It is important to note that due to the way the Aspeed chip lets the
kernel configure the mapping between host LPC addresses and BMC ram
addresses the offset within the window must be a multiple of size.
Not doing so will fragment the accessible space rather than simply
moving 'zero' upwards. This is caused by the nature of HICR8 being a
mask and the way host LPC addresses are translated.

Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agozorro: stop creating attributes by hand
Dmitry Torokhov [Tue, 14 Feb 2017 20:24:09 +0000 (12:24 -0800)]
zorro: stop creating attributes by hand

Instead of creating attributes one by one, define attribute_group array
and attach it to bus->dev_groups, so that all needed attributes are created
automatically when a new device is registered on the bus.

Also switch to using standard DEVICE_ATTR_RO() macros.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agoMAINTAINERS: update firmware loader entry
Ming Lei [Thu, 23 Feb 2017 01:29:26 +0000 (09:29 +0800)]
MAINTAINERS: update firmware loader entry

This email of 'ming.lei@canonical.com' isn't valid any more,
please remove the entry.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agorapidio: use is_visible() to hide switch-specific attributes
Dmitry Torokhov [Wed, 15 Feb 2017 19:50:55 +0000 (11:50 -0800)]
rapidio: use is_visible() to hide switch-specific attributes

Instead of creating switch-specific attributes by hand, implement
is_visible() method of attribute group and hide them when dealing with
non-switch devices. This will ensure that all attributes are created
together, before userspace gets notified of new device.

Also, remove rio-sysfs.c from list of files that are scanned when compiling
RapiodIO documentations as it no longer has any structured comments, and
leaving it in leads to warning when building docs.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agobinder: Add 'hwbinder' to the default devices
Rob Herring [Wed, 15 Feb 2017 15:35:15 +0000 (09:35 -0600)]
binder: Add 'hwbinder' to the default devices

As AOSP master is now starting to require a hwbinder device, add it to
the the default Kconfig. Having the hwbinder device when not needed
shouldn't hurt anything either.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Martijn Coenen <maco@google.com>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Amit Pundir <amit.pundir@linaro.org>
Cc: Serban Constantinescu <serban.constantinescu@arm.com>
Cc: Dmitry Shmidt <dimitrysh@google.com>
Cc: Rom Lemarchand <romlem@google.com>
Cc: Android Kernel Team <kernel-team@android.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agoDrivers: hv: Base autoeoi enablement based on hypervisor hints
K. Y. Srinivasan [Wed, 15 Mar 2017 01:01:39 +0000 (18:01 -0700)]
Drivers: hv: Base autoeoi enablement based on hypervisor hints

Don't enable auto-eoi if the hypervisor recommends otherwise. This will
enable vAPIC functionality if available.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agoDrivers: hv: Fix a typo
K. Y. Srinivasan [Wed, 15 Mar 2017 01:01:38 +0000 (18:01 -0700)]
Drivers: hv: Fix a typo

Fix a typo in the macro.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agovmbus: expose debug info for drivers
Stephen Hemminger [Sun, 5 Mar 2017 01:27:18 +0000 (18:27 -0700)]
vmbus: expose debug info for drivers

Allow driver to get debug information about state of the ring.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agovmbus: cleanup header file style
Stephen Hemminger [Sun, 5 Mar 2017 01:27:17 +0000 (18:27 -0700)]
vmbus: cleanup header file style

Minor changes to align hyper-v vmbus include files with current
linux kernel style.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agovmbus: make channel_message table constant
Stephen Hemminger [Sun, 5 Mar 2017 01:27:16 +0000 (18:27 -0700)]
vmbus: make channel_message table constant

This table is immutable and should be const.
Cleanup indentation and whitespace for this as well.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agohyperv: remove unnecessary return variable
Stephen Hemminger [Sun, 5 Mar 2017 01:27:15 +0000 (18:27 -0700)]
hyperv: remove unnecessary return variable

hv_ringbuffer_read cleanup.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agovmbus: fix spelling errors
Stephen Hemminger [Sun, 5 Mar 2017 01:27:14 +0000 (18:27 -0700)]
vmbus: fix spelling errors

Several spelling errors in comments

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agovmbus: remove unnecessary initialization
Stephen Hemminger [Sun, 5 Mar 2017 01:27:13 +0000 (18:27 -0700)]
vmbus: remove unnecessary initialization

Don't initialize variables that are then set a few lines later.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agovmbus: remove useless return's
Stephen Hemminger [Sun, 5 Mar 2017 01:27:12 +0000 (18:27 -0700)]
vmbus: remove useless return's

No need for empty return at end of void function

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agohyperv: fix warning about missing prototype
Stephen Hemminger [Sun, 5 Mar 2017 01:27:11 +0000 (18:27 -0700)]
hyperv: fix warning about missing prototype

Compiling with warnings enabled finds missing prototype for
hv_do_hypercall.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agovmbus: only reschedule tasklet if time limit exceeded
Stephen Hemminger [Sun, 5 Mar 2017 01:27:10 +0000 (18:27 -0700)]
vmbus: only reschedule tasklet if time limit exceeded

The change to reschedule tasklet if more data arrives in ring buffer
can cause performance regression if host timing is such that the
next response happens in small window.

Go back to a modified version of the original looping behavior.
If the race occurs in a small time, then loop. But if the tasklet
has been running for a long interval due to flood, then reschedule
the tasklet to allow migration to ksoftirqd.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agofpga: bridge: Replace open-coded list_for_each + list_entry
Moritz Fischer [Fri, 10 Mar 2017 20:47:11 +0000 (12:47 -0800)]
fpga: bridge: Replace open-coded list_for_each + list_entry

Replaces open-coded list_for_each() + list_entry() with macro
list_for_each_entry()

Signed-off-by: Moritz Fischer <mdf@kernel.org>
Cc: linux-fpga@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Acked-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agofpga: Add support for Lattice iCE40 FPGAs
Joel Holdsworth [Mon, 27 Feb 2017 22:14:26 +0000 (16:14 -0600)]
fpga: Add support for Lattice iCE40 FPGAs

This patch adds support to the FPGA manager for configuring the SRAM of
iCE40LM, iCE40LP, iCE40HX, iCE40 Ultra, iCE40 UltraLite and iCE40
UltraPlus devices, through slave SPI.

Signed-off-by: Joel Holdsworth <joel@airwebreathe.org.uk>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Moritz Fischer <moritz.fischer@ettus.com>
Acked-by: Alan Tull <atull@opensource.altera.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agoDocumentation: Add binding document for Lattice iCE40 FPGA manager
Joel Holdsworth [Mon, 27 Feb 2017 22:14:25 +0000 (16:14 -0600)]
Documentation: Add binding document for Lattice iCE40 FPGA manager

This adds documentation of the device tree bindings of the Lattice iCE40
FPGA driver for the FPGA manager framework.

Signed-off-by: Joel Holdsworth <joel@airwebreathe.org.uk>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Alan Tull <atull@opensource.altera.com>
Acked-by: Moritz Fischer <moritz.fischer@ettus.com>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agoARM: ep93xx: Register ts73xx-fpga manager driver for TS-7300
Florian Fainelli [Mon, 27 Feb 2017 22:14:23 +0000 (16:14 -0600)]
ARM: ep93xx: Register ts73xx-fpga manager driver for TS-7300

Register the TS-7300 FPGA manager device drivers which allows us to load
bitstreams into the on-board Altera Cyclone II FPGA.

Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Alan Tull <atull@opensource.altera.com>
Acked-by: Moritz Fischer <moritz.fischer@ettus.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agoFPGA: Add TS-7300 FPGA manager
Florian Fainelli [Mon, 27 Feb 2017 22:14:22 +0000 (16:14 -0600)]
FPGA: Add TS-7300 FPGA manager

Add support for loading bitstreams on the Altera Cyclone II FPGA
populated on the TS-7300 board. This is done through the configuration
and data registers offered through a memory interface between the EP93xx
SoC and the FPGA via an intermediate CPLD device.

The EP93xx SoC on the TS-7300 does not have direct means of configuring
the on-board FPGA other than by using the special memory mapped
interface to the CPLD. No other entity on the system can control the
FPGA bitstream.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Alan Tull <atull@opensource.altera.com>
Acked-by: Moritz Fischer <moritz.fischer@ettus.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agofpga: region: Add fpga-region property 'encrypted-fpga-config'
Moritz Fischer [Mon, 27 Feb 2017 15:19:02 +0000 (09:19 -0600)]
fpga: region: Add fpga-region property 'encrypted-fpga-config'

Add fpga-region property to allow passing the fact that the bitstream is
encrypted to the fpga-region and ultimately to the low-level driver.

Signed-off-by: Moritz Fischer <mdf@kernel.org>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agofpga: zynq: Add support for encrypted bitstreams
Moritz Fischer [Mon, 27 Feb 2017 15:19:01 +0000 (09:19 -0600)]
fpga: zynq: Add support for encrypted bitstreams

Add support for encrypted bitstreams. For this to work the system
must be booted in secure mode.

In order for on-the-fly decryption to work, the PCAP clock rate
needs to be lowered via the PCAP_RATE_EN bit.

Signed-off-by: Moritz Fischer <mdf@kernel.org>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agofpga: Add flag to indicate bitstream needs decrypting
Moritz Fischer [Mon, 27 Feb 2017 15:19:00 +0000 (09:19 -0600)]
fpga: Add flag to indicate bitstream needs decrypting

Add a flag that is passed to the write_init() callback, indicating
that the bitstream is encrypted.

The low-level driver will deal with the flag, or return an error,
if encrypted bitstreams are not supported.

Signed-off-by: Moritz Fischer <mdf@kernel.org>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agofpga: fix sparse warnings in fpga-mgr and fpga-bridge
Dinh Nguyen [Mon, 27 Feb 2017 15:18:59 +0000 (09:18 -0600)]
fpga: fix sparse warnings in fpga-mgr and fpga-bridge

Fix up these sparse warnings:

drivers/fpga/fpga-mgr.c:189:21: warning: symbol '__fpga_mgr_get' was not declared. Should it be static?
drivers/fpga/fpga-bridge.c:30:12: warning: symbol 'bridge_list_lock' was not declared. Should it be static?

Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Acked-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agoLinux 4.11-rc2
Linus Torvalds [Sun, 12 Mar 2017 21:47:08 +0000 (14:47 -0700)]
Linux 4.11-rc2

7 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Linus Torvalds [Sun, 12 Mar 2017 21:22:25 +0000 (14:22 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/s390/linux

Pull s390 fixes from Martin Schwidefsky:

 - four patches to get the new cputime code in shape for s390

 - add the new statx system call

 - a few bug fixes

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390: wire up statx system call
  KVM: s390: Fix guest migration for huge guests resulting in panic
  s390/ipl: always use load normal for CCW-type re-IPL
  s390/timex: micro optimization for tod_to_ns
  s390/cputime: provide archicture specific cputime_to_nsecs
  s390/cputime: reset all accounting fields on fork
  s390/cputime: remove last traces of cputime_t
  s390: fix in-kernel program checks
  s390/crypt: fix missing unlock in ctr_paes_crypt on error path

7 years agoMerge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 12 Mar 2017 21:18:49 +0000 (14:18 -0700)]
Merge branch 'x86-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86 fixes from Thomas Gleixner:

 - a fix for the kexec/purgatory regression which was introduced in the
   merge window via an innocent sparse fix. We could have reverted that
   commit, but on deeper inspection it turned out that the whole
   machinery is neither documented nor robust. So a proper cleanup was
   done instead

 - the fix for the TLB flush issue which was discovered recently

 - a simple typo fix for a reboot quirk

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/tlb: Fix tlb flushing when lguest clears PGE
  kexec, x86/purgatory: Unbreak it and clean it up
  x86/reboot/quirks: Fix typo in ASUS EeeBook X205TA reboot quirk

7 years agoMerge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 12 Mar 2017 21:11:38 +0000 (14:11 -0700)]
Merge branch 'irq-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull irq fixes from Thomas Gleixner:

 - a workaround for a GIC erratum

 - a missing stub function for CONFIG_IRQDOMAIN=n

 - fixes for a couple of type inconsistencies

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/crossbar: Fix incorrect type of register size
  irqchip/gicv3-its: Add workaround for QDF2400 ITS erratum 0065
  irqdomain: Add empty irq_domain_check_msi_remap
  irqchip/crossbar: Fix incorrect type of local variables

7 years agox86/tlb: Fix tlb flushing when lguest clears PGE
Daniel Borkmann [Sat, 11 Mar 2017 00:31:19 +0000 (01:31 +0100)]
x86/tlb: Fix tlb flushing when lguest clears PGE

Fengguang reported random corruptions from various locations on x86-32
after commits d2852a224050 ("arch: add ARCH_HAS_SET_MEMORY config") and
9d876e79df6a ("bpf: fix unlocking of jited image when module ronx not set")
that uses the former. While x86-32 doesn't have a JIT like x86_64, the
bpf_prog_lock_ro() and bpf_prog_unlock_ro() got enabled due to
ARCH_HAS_SET_MEMORY, whereas Fengguang's test kernel doesn't have module
support built in and therefore never had the DEBUG_SET_MODULE_RONX setting
enabled.

After investigating the crashes further, it turned out that using
set_memory_ro() and set_memory_rw() didn't have the desired effect, for
example, setting the pages as read-only on x86-32 would still let
probe_kernel_write() succeed without error. This behavior would manifest
itself in situations where the vmalloc'ed buffer was accessed prior to
set_memory_*() such as in case of bpf_prog_alloc(). In cases where it
wasn't, the page attribute changes seemed to have taken effect, leading to
the conclusion that a TLB invalidate didn't happen. Moreover, it turned out
that this issue reproduced with qemu in "-cpu kvm64" mode, but not for
"-cpu host". When the issue occurs, change_page_attr_set_clr() did trigger
a TLB flush as expected via __flush_tlb_all() through cpa_flush_range(),
though.

There are 3 variants for issuing a TLB flush: invpcid_flush_all() (depends
on CPU feature bits X86_FEATURE_INVPCID, X86_FEATURE_PGE), cr4 based flush
(depends on X86_FEATURE_PGE), and cr3 based flush.  For "-cpu host" case in
my setup, the flush used invpcid_flush_all() variant, whereas for "-cpu
kvm64", the flush was cr4 based. Switching the kvm64 case to cr3 manually
worked fine, and further investigating the cr4 one turned out that
X86_CR4_PGE bit was not set in cr4 register, meaning the
__native_flush_tlb_global_irq_disabled() wrote cr4 twice with the same
value instead of clearing X86_CR4_PGE in the first write to trigger the
flush.

It turned out that X86_CR4_PGE was cleared from cr4 during init from
lguest_arch_host_init() via adjust_pge(). The X86_FEATURE_PGE bit is also
cleared from there due to concerns of using PGE in guest kernel that can
lead to hard to trace bugs (see bff672e630a0 ("lguest: documentation V:
Host") in init()). The CPU feature bits are cleared in dynamic
boot_cpu_data, but they never propagated to __flush_tlb_all() as it uses
static_cpu_has() instead of boot_cpu_has() for testing which variant of TLB
flushing to use, meaning they still used the old setting of the host
kernel.

Clearing via setup_clear_cpu_cap(X86_FEATURE_PGE) so this would propagate
to static_cpu_has() checks is too late at this point as sections have been
patched already, so for now, it seems reasonable to switch back to
boot_cpu_has(X86_FEATURE_PGE) as it was prior to commit c109bf95992b
("x86/cpufeature: Remove cpu_has_pge"). This lets the TLB flush trigger via
cr3 as originally intended, properly makes the new page attributes visible
and thus fixes the crashes seen by Fengguang.

Fixes: c109bf95992b ("x86/cpufeature: Remove cpu_has_pge")
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: bp@suse.de
Cc: Kees Cook <keescook@chromium.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: lkp@01.org
Cc: Laura Abbott <labbott@redhat.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernrl.org/r/20170301125426.l4nf65rx4wahohyl@wfg-t540p.sh.intel.com
Link: http://lkml.kernel.org/r/25c41ad9eca164be4db9ad84f768965b7eb19d9e.1489191673.git.daniel@iogearbox.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
7 years agoMerge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Linus Torvalds [Sat, 11 Mar 2017 22:24:58 +0000 (14:24 -0800)]
Merge tag 'for-linus' of git://git./virt/kvm/kvm

Pull KVM fixes from Radim Krčmář:
 "ARM updates from Marc Zyngier:
   - vgic updates:
     - Honour disabling the ITS
     - Don't deadlock when deactivating own interrupts via MMIO
     - Correctly expose the lact of IRQ/FIQ bypass on GICv3

   - I/O virtualization:
     - Make KVM_CAP_NR_MEMSLOTS big enough for large guests with many
       PCIe devices

   - General bug fixes:
     - Gracefully handle exception generated with syndroms that the host
       doesn't understand
     - Properly invalidate TLBs on VHE systems

  x86:
   - improvements in emulation of VMCLEAR, VMX MSR bitmaps, and VCPU
     reset

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: nVMX: do not warn when MSR bitmap address is not backed
  KVM: arm64: Increase number of user memslots to 512
  KVM: arm/arm64: Remove KVM_PRIVATE_MEM_SLOTS definition that are unused
  KVM: arm/arm64: Enable KVM_CAP_NR_MEMSLOTS on arm/arm64
  KVM: Add documentation for KVM_CAP_NR_MEMSLOTS
  KVM: arm/arm64: VGIC: Fix command handling while ITS being disabled
  arm64: KVM: Survive unknown traps from guests
  arm: KVM: Survive unknown traps from guests
  KVM: arm/arm64: Let vcpu thread modify its own active state
  KVM: nVMX: reset nested_run_pending if the vCPU is going to be reset
  kvm: nVMX: VMCLEAR should not cause the vCPU to shut down
  KVM: arm/arm64: vgic-v3: Don't pretend to support IRQ/FIQ bypass
  arm64: KVM: VHE: Clear HCR_TGE when invalidating guest TLBs

7 years agoMerge tag 'extable-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
Linus Torvalds [Sat, 11 Mar 2017 22:16:50 +0000 (14:16 -0800)]
Merge tag 'extable-fix' of git://git./linux/kernel/git/paulg/linux

Pull extable.h fix from Paul Gortmaker:
 "Fixup for arch/score after extable.h introduction.

  It seems that Guenter is the only one on the planet doing builds for
  arch/score -- we don't have compile coverage for it in linux-next or
  in the kbuild-bot either. Guenter couldn't even recall where he got
  his toolchain, but was kind enough to share it with me so I could
  validate this change and also add arch/score to my build coverage.

  I sat on this a bit in case there was any other fallout in other arch
  dirs, but since this still seems to be the only one, I might as well
  send it on its way"

* tag 'extable-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux:
  score: Fix implicit includes now failing build after extable change

7 years agoMerge tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso...
Linus Torvalds [Sat, 11 Mar 2017 17:08:47 +0000 (09:08 -0800)]
Merge tag 'random_for_linus' of git://git./linux/kernel/git/tytso/random

Pull random updates from Ted Ts'o:
 "Change get_random_{int,log} to use the CRNG used by /dev/urandom and
  getrandom(2). It's faster and arguably more secure than cut-down MD5
  that we had been using.

  Also do some code cleanup"

* tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random:
  random: move random_min_urandom_seed into CONFIG_SYSCTL ifdef block
  random: convert get_random_int/long into get_random_u32/u64
  random: use chacha20 for get_random_int/long
  random: fix comment for unused random_min_urandom_seed
  random: remove variable limit
  random: remove stale urandom_init_wait
  random: remove stale maybe_reseed_primary_crng

7 years agoscore: Fix implicit includes now failing build after extable change
Guenter Roeck [Wed, 22 Feb 2017 19:07:57 +0000 (11:07 -0800)]
score: Fix implicit includes now failing build after extable change

After changing from module.h to extable.h, score builds fail with:

  arch/score/kernel/traps.c: In function 'do_ri':
  arch/score/kernel/traps.c:248:4: error: implicit declaration of function 'user_disable_single_step'
  arch/score/mm/extable.c: In function 'fixup_exception':
  arch/score/mm/extable.c:32:38: error: dereferencing pointer to incomplete type
  arch/score/mm/extable.c:34:24: error: dereferencing pointer to incomplete type

because extable.h doesn't drag in the same amount of headers as the
module.h did.  Add in the headers which were implicitly expected.

Fixes: 90858794c960 ("module.h: remove extable.h include now users have migrated")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
[PG: tweak commit log; refresh for sched header refactoring.]
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
7 years agoMerge tag 'tty-4.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Linus Torvalds [Sat, 11 Mar 2017 08:20:12 +0000 (00:20 -0800)]
Merge tag 'tty-4.11-rc2' of git://git./linux/kernel/git/gregkh/tty

Pull tty/serial fixes frpm Greg KH:
 "Here are two bugfixes for tty stuff for 4.11-rc2.

  One of them resolves the pretty bad bug in the n_hdlc code that
  Alexander Popov found and fixed and has been reported everywhere. The
  other just fixes a samsung serial driver issue when DMA fails on some
  systems.

  Both have been in linux-next with no reported issues"

* tag 'tty-4.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  serial: samsung: Continue to work if DMA request fails
  tty: n_hdlc: get rid of racy n_hdlc.tbuf

7 years agoMerge tag 'staging-4.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
Linus Torvalds [Sat, 11 Mar 2017 08:13:28 +0000 (00:13 -0800)]
Merge tag 'staging-4.11-rc2' of git://git./linux/kernel/git/gregkh/staging

Pull staging driver fixes from Greg KH:
 "Here are two small build warning fixes for some staging drivers that
  Arnd has found on his valiant quest to get the kernel to build
  properly with no warnings.

  Both of these have been in linux-next this week and resolve the
  reported issues"

* tag 'staging-4.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  staging: octeon: remove unused variable
  staging/vc04_services: add CONFIG_OF dependency

7 years agoMerge tag 'usb-4.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Linus Torvalds [Sat, 11 Mar 2017 08:08:39 +0000 (00:08 -0800)]
Merge tag 'usb-4.11-rc2' of git://git./linux/kernel/git/gregkh/usb

Pull USB fixes from Greg KH:
 "Here is a number of different USB fixes for 4.11-rc2.

  Seems like there were a lot of unresolved issues that people have been
  finding for this subsystem, and a bunch of good security auditing
  happening as well from Johan Hovold. There's the usual batch of gadget
  driver fixes and xhci issues resolved as well.

 All of these have been in linux-next with no reported issues"

* tag 'usb-4.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (35 commits)
  usb: host: xhci-plat: Fix timeout on removal of hot pluggable xhci controllers
  usb: host: xhci-dbg: HCIVERSION should be a binary number
  usb: xhci: remove dummy extra_priv_size for size of xhci_hcd struct
  usb: xhci-mtk: check hcc_params after adding primary hcd
  USB: serial: digi_acceleport: fix OOB-event processing
  MAINTAINERS: usb251xb: remove reference inexistent file
  doc: dt-bindings: usb251xb: mark reg as required
  usb: usb251xb: dt: add unit suffix to oc-delay and power-on-time
  usb: usb251xb: remove max_{power,current}_{sp,bp} properties
  usb-storage: Add ignore-residue quirk for Initio INIC-3619
  USB: iowarrior: fix NULL-deref in write
  USB: iowarrior: fix NULL-deref at probe
  usb: phy: isp1301: Add OF device ID table
  usb: ohci-at91: Do not drop unhandled USB suspend control requests
  USB: serial: safe_serial: fix information leak in completion handler
  USB: serial: io_ti: fix information leak in completion handler
  USB: serial: omninet: drop open callback
  USB: serial: omninet: fix reference leaks at open
  USB: serial: io_ti: fix NULL-deref in interrupt callback
  usb: dwc3: gadget: make to increment req->remaining in all cases
  ...

7 years agoMerge tag 'pinctrl-v4.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
Linus Torvalds [Sat, 11 Mar 2017 08:06:18 +0000 (00:06 -0800)]
Merge tag 'pinctrl-v4.11-2' of git://git./linux/kernel/git/linusw/linux-pinctrl

Pull pinctrl fixes from Linus Walleij:
 "Two smaller pin control fixes for the v4.11 series:

   - Add a get_direction() function to the qcom driver

   - Fix two pin names in the uniphier driver"

* tag 'pinctrl-v4.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
  pinctrl: uniphier: change pin names of aio/xirq for LD11
  pinctrl: qcom: add get_direction function

7 years agokexec, x86/purgatory: Unbreak it and clean it up
Thomas Gleixner [Fri, 10 Mar 2017 12:17:18 +0000 (13:17 +0100)]
kexec, x86/purgatory: Unbreak it and clean it up

The purgatory code defines global variables which are referenced via a
symbol lookup in the kexec code (core and arch).

A recent commit addressing sparse warnings made these static and thereby
broke kexec_file.

Why did this happen? Simply because the whole machinery is undocumented and
lacks any form of forward declarations. The variable names are unspecific
and lack a prefix, so adding forward declarations creates shadow variables
in the core code. Aside of that the code relies on magic constants and
duplicate struct definitions with no way to ensure that these things stay
in sync. The section placement of the purgatory variables happened by
chance and not by design.

Unbreak kexec and cleanup the mess:

 - Add proper forward declarations and document the usage
 - Use common struct definition
 - Use the proper common defines instead of magic constants
 - Add a purgatory_ prefix to have a proper name space
 - Use ARRAY_SIZE() instead of a homebrewn reimplementation
 - Add proper sections to the purgatory variables [ From Mike ]

Fixes: 72042a8c7b01 ("x86/purgatory: Make functions and variables static")
Reported-by: Mike Galbraith <<efault@gmx.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Nicholas Mc Guire <der.herr@hofr.at>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: "Tobin C. Harding" <me@tobin.cc>
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1703101315140.3681@nanos
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
7 years agoMerge tag 'ceph-for-4.11-rc2' of git://github.com/ceph/ceph-client
Linus Torvalds [Fri, 10 Mar 2017 19:05:47 +0000 (11:05 -0800)]
Merge tag 'ceph-for-4.11-rc2' of git://github.com/ceph/ceph-client

Pull ceph fixes from Ilya Dryomov:

 - a fix for the recently discovered misdirected requests bug present in
   jewel and later on the server side and all stable kernels

 - a fixup for -rc1 CRUSH changes

 - two usability enhancements: osd_request_timeout option and
   supported_features bus attribute.

* tag 'ceph-for-4.11-rc2' of git://github.com/ceph/ceph-client:
  libceph: osd_request_timeout option
  rbd: supported_features bus attribute
  libceph: don't set weight to IN when OSD is destroyed
  libceph: fix crush_decode() for older maps

7 years agoMerge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa...
Linus Torvalds [Fri, 10 Mar 2017 17:56:16 +0000 (09:56 -0800)]
Merge branch 'i2c/for-current' of git://git./linux/kernel/git/wsa/linux

Pull i2c fixes from Wolfram Sang:
 "Here are some driver bugfixes from I2C.

  Unusual this time are the two reverts. One because I accidently picked
  a patch from the list which I should have pulled from my co-maintainer
  instead ("missing of_node_put"). And one which I wrongly assumed to be
  an easy fix but it turned out already that it needs more iterations
  ("copy device properties")"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  Revert "i2c: copy device properties when using i2c_register_board_info()"
  Revert "i2c: add missing of_node_put in i2c_mux_del_adapters"
  i2c: exynos5: Avoid transaction timeouts due TRANSFER_DONE_AUTO not set
  i2c: designware: add reset interface
  i2c: meson: fix wrong variable usage in meson_i2c_put_data
  i2c: copy device properties when using i2c_register_board_info()
  i2c: m65xx: drop superfluous quirk structure
  i2c: brcmstb: Fix START and STOP conditions
  i2c: add missing of_node_put in i2c_mux_del_adapters
  i2c: riic: fix restart condition
  i2c: add missing of_node_put in i2c_mux_del_adapters

7 years agoMerge tag 'drm-fixes-for-4.11-rc2' of git://people.freedesktop.org/~airlied/linux
Linus Torvalds [Fri, 10 Mar 2017 17:53:00 +0000 (09:53 -0800)]
Merge tag 'drm-fixes-for-4.11-rc2' of git://people.freedesktop.org/~airlied/linux

Pull drm fixes from Dave Airlie:
 "Intel, amd and mxsfb fixes.

  These are the drm fixes I've collected for rc2. Mostly i915 GVT only
  fixes, along with a single EDID fix, some mxsfb fixes and a few minor
  amd fixes"

* tag 'drm-fixes-for-4.11-rc2' of git://people.freedesktop.org/~airlied/linux: (38 commits)
  drm: mxsfb: Implement drm_panel handling
  drm: mxsfb_crtc: Fix the framebuffer misplacement
  drm: mxsfb: Fix crash when provided invalid DT bindings
  drm: mxsfb: fix pixel clock polarity
  drm: mxsfb: use bus_format to determine LCD bus width
  drm/amdgpu: bump driver version for some new features
  drm/amdgpu: validate paramaters in the gem ioctl
  drm/amd/amdgpu: fix console deadlock if late init failed
  drm/i915/gvt: change some gvt_err to gvt_dbg_cmd
  drm/i915/gvt: protect RO and Rsvd bits of virtual vgpu configuration space
  drm/i915/gvt: handle workload lifecycle properly
  drm/edid: Add EDID_QUIRK_FORCE_8BPC quirk for Rotel RSX-1058
  drm/i915/gvt: fix an error for F_RO flag
  drm/i915/gvt: use pfn_valid for better checking
  drm/i915/gvt: set SFUSE_STRAP properly for vitual monitor detection
  drm/i915/gvt: fix an error for one register
  drm/i915/gvt: add more registers into handlers list
  drm/i915/gvt: have more registers with F_CMD_ACCESS flags set
  drm/i915/gvt: add some new MMIOs to cmd_access white list
  drm/i915/gvt: fix pcode mailbox write emulation of BDW
  ...

7 years agoMerge branch 'prep-for-5level'
Linus Torvalds [Fri, 10 Mar 2017 16:59:07 +0000 (08:59 -0800)]
Merge branch 'prep-for-5level'

Merge 5-level page table prep from Kirill Shutemov:
 "Here's relatively low-risk part of 5-level paging patchset. Merging it
  now will make x86 5-level paging enabling in v4.12 easier.

  The first patch is actually x86-specific: detect 5-level paging
  support. It boils down to single define.

  The rest of patchset converts Linux MMU abstraction from 4- to 5-level
  paging.

  Enabling of new abstraction in most cases requires adding single line
  of code in arch-specific code. The rest is taken care by asm-generic/.

  Changes to mm/ code are mostly mechanical: add support for new page
  table level -- p4d_t -- where we deal with pud_t now.

  v2:
   - fix build on microblaze (Michal);
   - comment for __ARCH_HAS_5LEVEL_HACK in kasan_populate_zero_shadow();
   - acks from Michal"

* emailed patches from Kirill A Shutemov <kirill.shutemov@linux.intel.com>:
  mm: introduce __p4d_alloc()
  mm: convert generic code to 5-level paging
  asm-generic: introduce <asm-generic/pgtable-nop4d.h>
  arch, mm: convert all architectures to use 5level-fixup.h
  asm-generic: introduce __ARCH_USE_5LEVEL_HACK
  asm-generic: introduce 5level-fixup.h
  x86/cpufeature: Add 5-level paging detection

7 years agoMerge branch 'akpm' (patches from Andrew)
Linus Torvalds [Fri, 10 Mar 2017 16:34:42 +0000 (08:34 -0800)]
Merge branch 'akpm' (patches from Andrew)

Merge fixes from Andrew Morton:
 "26 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (26 commits)
  userfaultfd: remove wrong comment from userfaultfd_ctx_get()
  fat: fix using uninitialized fields of fat_inode/fsinfo_inode
  sh: cayman: IDE support fix
  kasan: fix races in quarantine_remove_cache()
  kasan: resched in quarantine_remove_cache()
  mm: do not call mem_cgroup_free() from within mem_cgroup_alloc()
  thp: fix another corner case of munlock() vs. THPs
  rmap: fix NULL-pointer dereference on THP munlocking
  mm/memblock.c: fix memblock_next_valid_pfn()
  userfaultfd: selftest: vm: allow to build in vm/ directory
  userfaultfd: non-cooperative: userfaultfd_remove revalidate vma in MADV_DONTNEED
  userfaultfd: non-cooperative: fix fork fctx->new memleak
  mm/cgroup: avoid panic when init with low memory
  drivers/md/bcache/util.h: remove duplicate inclusion of blkdev.h
  mm/vmstats: add thp_split_pud event for clarity
  include/linux/fs.h: fix unsigned enum warning with gcc-4.2
  userfaultfd: non-cooperative: release all ctx in dup_userfaultfd_complete
  userfaultfd: non-cooperative: robustness check
  userfaultfd: non-cooperative: rollback userfaultfd_exit
  x86, mm: unify exit paths in gup_pte_range()
  ...

7 years agox86/reboot/quirks: Fix typo in ASUS EeeBook X205TA reboot quirk
Matjaz Hegedic [Thu, 9 Mar 2017 13:00:17 +0000 (14:00 +0100)]
x86/reboot/quirks: Fix typo in ASUS EeeBook X205TA reboot quirk

The reboot quirk for ASUS EeeBook X205TA contains a typo in
DMI_PRODUCT_NAME, improperly referring to X205TAW instead of
X205TA, which prevents the quirk from being triggered. The
model X205TAW already has a reboot quirk of its own.

This fix simply removes the inappropriate final letter W.

Fixes: 90b28ded88dd ("x86/reboot/quirks: Add ASUS EeeBook X205TA reboot quirk")
Signed-off-by: Matjaz Hegedic <matjaz.hegedic@gmail.com>
Link: http://lkml.kernel.org/r/1489064417-7445-1-git-send-email-matjaz.hegedic@gmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
7 years agoMerge tag 'xfs-4.11-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Linus Torvalds [Fri, 10 Mar 2017 02:11:28 +0000 (18:11 -0800)]
Merge tag 'xfs-4.11-fixes-1' of git://git./fs/xfs/xfs-linux

Pull xfs fixes from Darrick Wong:
 "Here are some bug fixes for -rc2 to clean up the copy on write
  handling and to remove a cause of hangs.

   - Fix various iomap bugs

   - Fix overly aggressive CoW preallocation garbage collection

   - Fixes to CoW endio error handling

   - Fix some incorrect geometry calculations

   - Remove a potential system hang in bulkstat

   - Try to allocate blocks more aggressively to reduce ENOSPC errors"

* tag 'xfs-4.11-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: try any AG when allocating the first btree block when reflinking
  xfs: use iomap new flag for newly allocated delalloc blocks
  xfs: remove kmem_zalloc_greedy
  xfs: Use xfs_icluster_size_fsb() to calculate inode alignment mask
  xfs: fix and streamline error handling in xfs_end_io
  xfs: only reclaim unwritten COW extents periodically
  iomap: invalidate page caches should be after iomap_dio_complete() in direct write

7 years agoMerge tag 'gcc-plugins-v4.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Fri, 10 Mar 2017 02:05:41 +0000 (18:05 -0800)]
Merge tag 'gcc-plugins-v4.11-rc2' of git://git./linux/kernel/git/kees/linux

Pull gcc-plugins fix from Kees Cook:
 "Fixes a typo in sancov plugin, exposed in earlier compiler versions"

* tag 'gcc-plugins-v4.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  gcc-plugins: fix sancov_plugin for gcc-5

7 years agodrm: mxsfb: Implement drm_panel handling
Fabio Estevam [Wed, 1 Feb 2017 17:19:47 +0000 (15:19 -0200)]
drm: mxsfb: Implement drm_panel handling

Currently when the 'power-supply' regulator is passed via device tree
it does not actually work since drm_panel_prepare()/drm_panel_enable()
are never called.

Quoting Thierry Reding: "It should really call drm_panel_prepare() and
drm_panel_enable() while switching on the display pipeline and
drm_panel_disable(), followed by drm_panel_unprepare() while switching
off the display pipeline."

So do as suggested, so that the 'power-supply' regulator can be functional.

Reported-by: Breno Lima <breno.lima@nxp.com>
Suggested-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
7 years agodrm: mxsfb_crtc: Fix the framebuffer misplacement
Fabio Estevam [Thu, 2 Feb 2017 21:26:38 +0000 (19:26 -0200)]
drm: mxsfb_crtc: Fix the framebuffer misplacement

Currently the framebuffer content is displayed with incorrect offsets
in both the vertical and horizontal directions.

The fbdev version of the driver does not show this problem. Breno Lima
dumped the eLCDIF controller registers on both the drm and fbdev drivers
and noticed that the VDCTRL3 register is configured incorrectly in the
drm driver.

The fbdev driver calculates the vertical and horizontal wait counts
of the VDCTRL3 register by doing: back porch + sync length.

Looking at the horizontal and vertical timing diagram from
include/drm/drm_modes.h this value corresponds to:

crtc_[hv]total - crtc_[hv]sync_start

So fix the VDCTRL3 register setting accordingly so that the eLCDIF
controller can properly show the framebuffer content in the correct
position.

Reported-by: Breno Lima <breno.lima@nxp.com>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Tested-by: Breno Lima <breno.lima@nxp.com>
Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
7 years agodrm: mxsfb: Fix crash when provided invalid DT bindings
Marek Vasut [Sat, 28 Jan 2017 17:01:57 +0000 (18:01 +0100)]
drm: mxsfb: Fix crash when provided invalid DT bindings

The mxsfb driver will crash if the mxsfb DT node has a subnode,
but the content of the subnode is not of-graph binding with an
endpoint linking to panel. The crash was triggered by providing
old-style panel bindings to the mxsfb driver instead of the new
of-graph ones.

The problem happens in mxsfb_create_output(), which is invoked
from mxsfb_load(). The mxsfb_create_output() iterates over all
mxsfb DT subnode endpoints and tries to bind a panel on each
endpoint. If there is any problem binding the panel, that is,
mxsfb->panel == NULL, this function will return an error code,
otherwise success 0 is returned.

If the subnodes do not specify of-graph binding with an endpoint,
the iteration over endpoints in mxsfb_create_output() will have
zero cycles and the function will immediatelly return 0, but the
mxsfb->panel will remain NULL. This is propagated back into the
mxsfb_load(), which does not detect any problem and expects that
the mxsfb->panel is valid, thus calls mxsfb_panel_attach(). But
since mxsfb->panel == NULL, mxsfb_panel_attach() is called with
first argument NULL and this crashes the kernel.

This patch fixes the problem by explicitly checking for valid
mxsfb->panel at the end of the iteration in mxsfb_create_output().

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Stefan Agner <stefan@agner.ch>
Cc: Breno Matheus Lima <brenomatheus@gmail.com>
Tested-by: Breno Lima <breno.lima@nxp.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
7 years agodrm: mxsfb: fix pixel clock polarity
Stefan Agner [Wed, 14 Dec 2016 20:48:09 +0000 (12:48 -0800)]
drm: mxsfb: fix pixel clock polarity

The DRM subsystem specifies the pixel clock polarity from a
controllers perspective: DRM_BUS_FLAG_PIXDATA_NEGEDGE means
the controller drives the data on pixel clocks falling edge.
That is the controllers DOTCLK_POL=0 (Default is data launched
at negative edge).

Also change the data enable logic to be high active by default
and only change if explicitly requested via bus_flags. With
that defaults are:
- Data enable: high active
- Pixel clock polarity: controller drives data on negative edge

Signed-off-by: Stefan Agner <stefan@agner.ch>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
7 years agodrm: mxsfb: use bus_format to determine LCD bus width
Stefan Agner [Thu, 15 Dec 2016 01:28:41 +0000 (17:28 -0800)]
drm: mxsfb: use bus_format to determine LCD bus width

The LCD bus width does not need to align with the pixel format. The
LCDIF controller automatically converts between pixel formats and
bus width by padding or dropping LSBs.

The DRM subsystem has the notion of bus_format which allows to
determine what bus_formats are supported by the display. Choose the
first available or fallback to 24 bit if none are available.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
7 years agoMerge branch 'drm-fixes-4.11' of git://people.freedesktop.org/~agd5f/linux into drm...
Dave Airlie [Fri, 10 Mar 2017 01:07:34 +0000 (11:07 +1000)]
Merge branch 'drm-fixes-4.11' of git://people.freedesktop.org/~agd5f/linux into drm-fixes

* 'drm-fixes-4.11' of git://people.freedesktop.org/~agd5f/linux:
  drm/amdgpu: bump driver version for some new features
  drm/amdgpu: validate paramaters in the gem ioctl
  drm/amd/amdgpu: fix console deadlock if late init failed

7 years agoMerge tag 'drm-intel-fixes-2017-03-09' of git://anongit.freedesktop.org/git/drm-intel...
Dave Airlie [Fri, 10 Mar 2017 01:07:13 +0000 (11:07 +1000)]
Merge tag 'drm-intel-fixes-2017-03-09' of git://anongit.freedesktop.org/git/drm-intel into drm-fixes

flushing out gvt-g fixes

* tag 'drm-intel-fixes-2017-03-09' of git://anongit.freedesktop.org/git/drm-intel: (29 commits)
  drm/i915/gvt: change some gvt_err to gvt_dbg_cmd
  drm/i915/gvt: protect RO and Rsvd bits of virtual vgpu configuration space
  drm/i915/gvt: handle workload lifecycle properly
  drm/i915/gvt: fix an error for F_RO flag
  drm/i915/gvt: use pfn_valid for better checking
  drm/i915/gvt: set SFUSE_STRAP properly for vitual monitor detection
  drm/i915/gvt: fix an error for one register
  drm/i915/gvt: add more registers into handlers list
  drm/i915/gvt: have more registers with F_CMD_ACCESS flags set
  drm/i915/gvt: add some new MMIOs to cmd_access white list
  drm/i915/gvt: fix pcode mailbox write emulation of BDW
  drm/i915/gvt: add resolution definition for vGPU type
  drm/i915/gvt: Add more edid definition support
  drm/i915/gvt: adjust to fixed vGPU types
  drm/i915/gvt: remove unnecessary error msg from gtt write
  drm/i915/gvt: refine pcode write emulation
  drm/i915/gvt: clear the vGPU reset logic
  drm/i915/gvt: decrease priority of output msg for untracked mmio
  drm/i915/gvt: set default value to 0 for unhandled mmio regs
  drm/i915/gvt: add cmd_access to GEN7_HALF_SLICE_CHICKEN1
  ...

7 years agoMerge tag 'drm-misc-fixes-2017-03-06' of git://anongit.freedesktop.org/git/drm-misc...
Dave Airlie [Fri, 10 Mar 2017 01:06:46 +0000 (11:06 +1000)]
Merge tag 'drm-misc-fixes-2017-03-06' of git://anongit.freedesktop.org/git/drm-misc into drm-fixes

Just 1 8bpc quirk from Ville, cc: stable

* tag 'drm-misc-fixes-2017-03-06' of git://anongit.freedesktop.org/git/drm-misc:
  drm/edid: Add EDID_QUIRK_FORCE_8BPC quirk for Rotel RSX-1058

7 years agouserfaultfd: remove wrong comment from userfaultfd_ctx_get()
David Hildenbrand [Fri, 10 Mar 2017 00:17:40 +0000 (16:17 -0800)]
userfaultfd: remove wrong comment from userfaultfd_ctx_get()

It's a void function, so there is no return value;

Link: http://lkml.kernel.org/r/20170309150817.7510-1-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 years agofat: fix using uninitialized fields of fat_inode/fsinfo_inode
OGAWA Hirofumi [Fri, 10 Mar 2017 00:17:37 +0000 (16:17 -0800)]
fat: fix using uninitialized fields of fat_inode/fsinfo_inode

Recently fallocate patch was merged and it uses
MSDOS_I(inode)->mmu_private at fat_evict_inode().  However,
fat_inode/fsinfo_inode that was introduced in past didn't initialize
MSDOS_I(inode) properly.

With those combinations, it became the cause of accessing random entry
in FAT area.

Link: http://lkml.kernel.org/r/87pohrj4i8.fsf@mail.parknet.co.jp
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Reported-by: Moreno Bartalucci <moreno.bartalucci@tecnorama.it>
Tested-by: Moreno Bartalucci <moreno.bartalucci@tecnorama.it>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 years agosh: cayman: IDE support fix
Bartlomiej Zolnierkiewicz [Fri, 10 Mar 2017 00:17:34 +0000 (16:17 -0800)]
sh: cayman: IDE support fix

Remove incorrect CONFIG_IDE ifdef (CONFIG_IDE config option is for
internal drivers/ide/ use) and make IDE hardware interface always
initialized (not only when IDE subsystem is built-in).

This patch allows Cayman board to work with modular IDE subsystem
support and removes the requirement of having the whole core IDE
subsystem built-in when using libata PATA support.

Link: http://lkml.kernel.org/r/1990884.yFoE6lSB9G@amdc3058
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 years agokasan: fix races in quarantine_remove_cache()
Dmitry Vyukov [Fri, 10 Mar 2017 00:17:32 +0000 (16:17 -0800)]
kasan: fix races in quarantine_remove_cache()

quarantine_remove_cache() frees all pending objects that belong to the
cache, before we destroy the cache itself.  However there are currently
two possibilities how it can fail to do so.

First, another thread can hold some of the objects from the cache in
temp list in quarantine_put().  quarantine_put() has a windows of
enabled interrupts, and on_each_cpu() in quarantine_remove_cache() can
finish right in that window.  These objects will be later freed into the
destroyed cache.

Then, quarantine_reduce() has the same problem.  It grabs a batch of
objects from the global quarantine, then unlocks quarantine_lock and
then frees the batch.  quarantine_remove_cache() can finish while some
objects from the cache are still in the local to_free list in
quarantine_reduce().

Fix the race with quarantine_put() by disabling interrupts for the whole
duration of quarantine_put().  In combination with on_each_cpu() in
quarantine_remove_cache() it ensures that quarantine_remove_cache()
either sees the objects in the per-cpu list or in the global list.

Fix the race with quarantine_reduce() by protecting quarantine_reduce()
with srcu critical section and then doing synchronize_srcu() at the end
of quarantine_remove_cache().

I've done some assessment of how good synchronize_srcu() works in this
case.  And on a 4 CPU VM I see that it blocks waiting for pending read
critical sections in about 2-3% of cases.  Which looks good to me.

I suspect that these races are the root cause of some GPFs that I
episodically hit.  Previously I did not have any explanation for them.

  BUG: unable to handle kernel NULL pointer dereference at 00000000000000c8
  IP: qlist_free_all+0x2e/0xc0 mm/kasan/quarantine.c:155
  PGD 6aeea067
  PUD 60ed7067
  PMD 0
  Oops: 0000 [#1] SMP KASAN
  Dumping ftrace buffer:
     (ftrace buffer empty)
  Modules linked in:
  CPU: 0 PID: 13667 Comm: syz-executor2 Not tainted 4.10.0+ #60
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
  task: ffff88005f948040 task.stack: ffff880069818000
  RIP: 0010:qlist_free_all+0x2e/0xc0 mm/kasan/quarantine.c:155
  RSP: 0018:ffff88006981f298 EFLAGS: 00010246
  RAX: ffffea0000ffff00 RBX: 0000000000000000 RCX: ffffea0000ffff1f
  RDX: 0000000000000000 RSI: ffff88003fffc3e0 RDI: 0000000000000000
  RBP: ffff88006981f2c0 R08: ffff88002fed7bd8 R09: 00000001001f000d
  R10: 00000000001f000d R11: ffff88006981f000 R12: ffff88003fffc3e0
  R13: ffff88006981f2d0 R14: ffffffff81877fae R15: 0000000080000000
  FS:  00007fb911a2d700(0000) GS:ffff88003ec00000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 00000000000000c8 CR3: 0000000060ed6000 CR4: 00000000000006f0
  Call Trace:
   quarantine_reduce+0x10e/0x120 mm/kasan/quarantine.c:239
   kasan_kmalloc+0xca/0xe0 mm/kasan/kasan.c:590
   kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:544
   slab_post_alloc_hook mm/slab.h:456 [inline]
   slab_alloc_node mm/slub.c:2718 [inline]
   kmem_cache_alloc_node+0x1d3/0x280 mm/slub.c:2754
   __alloc_skb+0x10f/0x770 net/core/skbuff.c:219
   alloc_skb include/linux/skbuff.h:932 [inline]
   _sctp_make_chunk+0x3b/0x260 net/sctp/sm_make_chunk.c:1388
   sctp_make_data net/sctp/sm_make_chunk.c:1420 [inline]
   sctp_make_datafrag_empty+0x208/0x360 net/sctp/sm_make_chunk.c:746
   sctp_datamsg_from_user+0x7e8/0x11d0 net/sctp/chunk.c:266
   sctp_sendmsg+0x2611/0x3970 net/sctp/socket.c:1962
   inet_sendmsg+0x164/0x5b0 net/ipv4/af_inet.c:761
   sock_sendmsg_nosec net/socket.c:633 [inline]
   sock_sendmsg+0xca/0x110 net/socket.c:643
   SYSC_sendto+0x660/0x810 net/socket.c:1685
   SyS_sendto+0x40/0x50 net/socket.c:1653

I am not sure about backporting.  The bug is quite hard to trigger, I've
seen it few times during our massive continuous testing (however, it
could be cause of some other episodic stray crashes as it leads to
memory corruption...).  If it is triggered, the consequences are very
bad -- almost definite bad memory corruption.  The fix is non trivial
and has chances of introducing new bugs.  I am also not sure how
actively people use KASAN on older releases.

[dvyukov@google.com: - sorted includes[
Link: http://lkml.kernel.org/r/20170309094028.51088-1-dvyukov@google.com
Link: http://lkml.kernel.org/r/20170308151532.5070-1-dvyukov@google.com
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Greg Thelen <gthelen@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 years agokasan: resched in quarantine_remove_cache()
Dmitry Vyukov [Fri, 10 Mar 2017 00:17:28 +0000 (16:17 -0800)]
kasan: resched in quarantine_remove_cache()

We see reported stalls/lockups in quarantine_remove_cache() on machines
with large amounts of RAM.  quarantine_remove_cache() needs to scan
whole quarantine in order to take out all objects belonging to the
cache.  Quarantine is currently 1/32-th of RAM, e.g.  on a machine with
256GB of memory that will be 8GB.  Moreover quarantine scanning is a
walk over uncached linked list, which is slow.

Add cond_resched() after scanning of each non-empty batch of objects.
Batches are specifically kept of reasonable size for quarantine_put().
On a machine with 256GB of RAM we should have ~512 non-empty batches,
each with 16MB of objects.

Link: http://lkml.kernel.org/r/20170308154239.25440-1-dvyukov@google.com
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 years agomm: do not call mem_cgroup_free() from within mem_cgroup_alloc()
Tahsin Erdogan [Fri, 10 Mar 2017 00:17:26 +0000 (16:17 -0800)]
mm: do not call mem_cgroup_free() from within mem_cgroup_alloc()

mem_cgroup_free() indirectly calls wb_domain_exit() which is not
prepared to deal with a struct wb_domain object that hasn't executed
wb_domain_init().  For instance, the following warning message is
printed by lockdep if alloc_percpu() fails in mem_cgroup_alloc():

  INFO: trying to register non-static key.
  the code is fine but needs lockdep annotation.
  turning off the locking correctness validator.
  CPU: 1 PID: 1950 Comm: mkdir Not tainted 4.10.0+ #151
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
  Call Trace:
   dump_stack+0x67/0x99
   register_lock_class+0x36d/0x540
   __lock_acquire+0x7f/0x1a30
   lock_acquire+0xcc/0x200
   del_timer_sync+0x3c/0xc0
   wb_domain_exit+0x14/0x20
   mem_cgroup_free+0x14/0x40
   mem_cgroup_css_alloc+0x3f9/0x620
   cgroup_apply_control_enable+0x190/0x390
   cgroup_mkdir+0x290/0x3d0
   kernfs_iop_mkdir+0x58/0x80
   vfs_mkdir+0x10e/0x1a0
   SyS_mkdirat+0xa8/0xd0
   SyS_mkdir+0x14/0x20
   entry_SYSCALL_64_fastpath+0x18/0xad

Add __mem_cgroup_free() which skips wb_domain_exit().  This is used by
both mem_cgroup_free() and mem_cgroup_alloc() clean up.

Fixes: 0b8f73e104285 ("mm: memcontrol: clean up alloc, online, offline, free functions")
Link: http://lkml.kernel.org/r/20170306192122.24262-1-tahsin@google.com
Signed-off-by: Tahsin Erdogan <tahsin@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 years agothp: fix another corner case of munlock() vs. THPs
Kirill A. Shutemov [Fri, 10 Mar 2017 00:17:23 +0000 (16:17 -0800)]
thp: fix another corner case of munlock() vs. THPs

The following test case triggers BUG() in munlock_vma_pages_range():

int main(int argc, char *argv[])
{
int fd;

system("mount -t tmpfs -o huge=always none /mnt");
fd = open("/mnt/test", O_CREAT | O_RDWR);
ftruncate(fd, 4UL << 20);
mmap(NULL, 4UL << 20, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_FIXED | MAP_LOCKED, fd, 0);
mmap(NULL, 4096, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_LOCKED, fd, 0);
munlockall();
return 0;
}

The second mmap() create PTE-mapping of the first huge page in file.  It
makes kernel munlock the page as we never keep PTE-mapped page mlocked.

On munlockall() when we handle vma created by the first mmap(),
munlock_vma_page() returns page_mask == 0, as the page is not mlocked
anymore.  On next iteration follow_page_mask() return tail page, but
page_mask is HPAGE_NR_PAGES - 1.  It makes us skip to the first tail
page of the next huge page and step on
VM_BUG_ON_PAGE(PageMlocked(page)).

The fix is not use the page_mask from follow_page_mask() at all.  It has
no use for us.

Link: http://lkml.kernel.org/r/20170302150252.34120-1-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: <stable@vger.kernel.org> [4.5+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 years agormap: fix NULL-pointer dereference on THP munlocking
Kirill A. Shutemov [Fri, 10 Mar 2017 00:17:20 +0000 (16:17 -0800)]
rmap: fix NULL-pointer dereference on THP munlocking

The following test case triggers NULL-pointer derefernce in
try_to_unmap_one():

#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>

int main(int argc, char *argv[])
{
int fd;

system("mount -t tmpfs -o huge=always none /mnt");
fd = open("/mnt/test", O_CREAT | O_RDWR);
ftruncate(fd, 2UL << 20);
mmap(NULL, 2UL << 20, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_FIXED | MAP_LOCKED, fd, 0);
mmap(NULL, 2UL << 20, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_LOCKED, fd, 0);
munlockall();
return 0;
}

Apparently, there's a case when we call try_to_unmap() on huge PMDs:
it's TTU_MUNLOCK.

Let's handle this case correctly.

Fixes: c7ab0d2fdc84 ("mm: convert try_to_unmap_one() to use page_vma_mapped_walk()")
Link: http://lkml.kernel.org/r/20170302151159.30592-1-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 years agomm/memblock.c: fix memblock_next_valid_pfn()
AKASHI Takahiro [Fri, 10 Mar 2017 00:17:17 +0000 (16:17 -0800)]
mm/memblock.c: fix memblock_next_valid_pfn()

Obviously, we should not access memblock.memory.regions[right] if
'right' is outside of [0..memblock.memory.cnt>.

Fixes: b92df1de5d28 ("mm: page_alloc: skip over regions of invalid pfns where possible")
Link: http://lkml.kernel.org/r/20170303023745.9104-1-takahiro.akashi@linaro.org
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 years agouserfaultfd: selftest: vm: allow to build in vm/ directory
Andrea Arcangeli [Fri, 10 Mar 2017 00:17:14 +0000 (16:17 -0800)]
userfaultfd: selftest: vm: allow to build in vm/ directory

linux/tools/testing/selftests/vm $ make

  gcc -Wall -I ../../../../usr/include     compaction_test.c -lrt -o /compaction_test
  /usr/lib/gcc/x86_64-pc-linux-gnu/4.9.4/../../../../x86_64-pc-linux-gnu/bin/ld: cannot open output file /compaction_test: Permission denied
  collect2: error: ld returned 1 exit status
  make: *** [../lib.mk:54: /compaction_test] Error 1

Since commit a8ba798bc8ec ("selftests: enable O and KBUILD_OUTPUT")
selftests/vm build fails if run from the "selftests/vm" directory, but
it works in the selftests/ directory.  It's quicker to be able to do a
local vm-only build after a tree wipe and this patch allows for it
again.

Link: http://lkml.kernel.org/r/20170302173738.18994-4-aarcange@redhat.com
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 years agouserfaultfd: non-cooperative: userfaultfd_remove revalidate vma in MADV_DONTNEED
Andrea Arcangeli [Fri, 10 Mar 2017 00:17:11 +0000 (16:17 -0800)]
userfaultfd: non-cooperative: userfaultfd_remove revalidate vma in MADV_DONTNEED

userfaultfd_remove() has to be execute before zapping the pagetables or
UFFDIO_COPY could keep filling pages after zap_page_range returned,
which would result in non zero data after a MADV_DONTNEED.

However userfaultfd_remove() may have to release the mmap_sem.  This was
handled correctly in MADV_REMOVE, but MADV_DONTNEED accessed a
potentially stale vma (the very vma passed to zap_page_range(vma, ...)).

The fix consists in revalidating the vma in case userfaultfd_remove()
had to release the mmap_sem.

This also optimizes away an unnecessary down_read/up_read in the
MADV_REMOVE case if UFFD_EVENT_FORK had to be delivered.

It all remains zero runtime cost in case CONFIG_USERFAULTFD=n as
userfaultfd_remove() will be defined as "true" at build time.

Link: http://lkml.kernel.org/r/20170302173738.18994-3-aarcange@redhat.com
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 years agouserfaultfd: non-cooperative: fix fork fctx->new memleak
Mike Rapoport [Fri, 10 Mar 2017 00:17:09 +0000 (16:17 -0800)]
userfaultfd: non-cooperative: fix fork fctx->new memleak

We have a memleak in the ->new ctx if the uffd of the parent is closed
before the fork event is read, nothing frees the new context.

Link: http://lkml.kernel.org/r/20170302173738.18994-2-aarcange@redhat.com
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Reported-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 years agomm/cgroup: avoid panic when init with low memory
Laurent Dufour [Fri, 10 Mar 2017 00:17:06 +0000 (16:17 -0800)]
mm/cgroup: avoid panic when init with low memory

The system may panic when initialisation is done when almost all the
memory is assigned to the huge pages using the kernel command line
parameter hugepage=xxxx.  Panic may occur like this:

  Unable to handle kernel paging request for data at address 0x00000000
  Faulting instruction address: 0xc000000000302b88
  Oops: Kernel access of bad area, sig: 11 [#1]
  SMP NR_CPUS=2048 [    0.082424] NUMA
  pSeries
  Modules linked in:
  CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.9.0-15-generic #16-Ubuntu
  task: c00000021ed01600 task.stack: c00000010d108000
  NIP: c000000000302b88 LR: c000000000270e04 CTR: c00000000016cfd0
  REGS: c00000010d10b2c0 TRAP: 0300   Not tainted (4.9.0-15-generic)
  MSR: 8000000002009033 <SF,VEC,EE,ME,IR,DR,RI,LE>[ 0.082770]   CR: 28424422  XER: 00000000
  CFAR: c0000000003d28b8 DAR: 0000000000000000 DSISR: 40000000 SOFTE: 1
  GPR00: c000000000270e04 c00000010d10b540 c00000000141a300 c00000010fff6300
  GPR04: 0000000000000000 00000000026012c0 c00000010d10b630 0000000487ab0000
  GPR08: 000000010ee90000 c000000001454fd8 0000000000000000 0000000000000000
  GPR12: 0000000000004400 c00000000fb80000 00000000026012c0 00000000026012c0
  GPR16: 00000000026012c0 0000000000000000 0000000000000000 0000000000000002
  GPR20: 000000000000000c 0000000000000000 0000000000000000 00000000024200c0
  GPR24: c0000000016eef48 0000000000000000 c00000010fff7d00 00000000026012c0
  GPR28: 0000000000000000 c00000010fff7d00 c00000010fff6300 c00000010d10b6d0
  NIP mem_cgroup_soft_limit_reclaim+0xf8/0x4f0
  LR do_try_to_free_pages+0x1b4/0x450
  Call Trace:
    do_try_to_free_pages+0x1b4/0x450
    try_to_free_pages+0xf8/0x270
    __alloc_pages_nodemask+0x7a8/0xff0
    new_slab+0x104/0x8e0
    ___slab_alloc+0x620/0x700
    __slab_alloc+0x34/0x60
    kmem_cache_alloc_node_trace+0xdc/0x310
    mem_cgroup_init+0x158/0x1c8
    do_one_initcall+0x68/0x1d0
    kernel_init_freeable+0x278/0x360
    kernel_init+0x24/0x170
    ret_from_kernel_thread+0x5c/0x74
  Instruction dump:
  eb81ffe0 eba1ffe8 ebc1fff0 ebe1fff8 4e800020 3d230001 e9499a42 3d220004
  3929acd8 794a1f24 7d295214 eac90100 <e93600002fa90000 419eff74 3b200000
  ---[ end trace 342f5208b00d01b6 ]---

This is a chicken and egg issue where the kernel try to get free memory
when allocating per node data in mem_cgroup_init(), but in that path
mem_cgroup_soft_limit_reclaim() is called which assumes that these data
are allocated.

As mem_cgroup_soft_limit_reclaim() is best effort, it should return when
these data are not yet allocated.

This patch also fixes potential null pointer access in
mem_cgroup_remove_from_trees() and mem_cgroup_update_tree().

Link: http://lkml.kernel.org/r/1487856999-16581-2-git-send-email-ldufour@linux.vnet.ibm.com
Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>