From: Christian Lamparter Date: Sat, 6 Aug 2022 17:44:02 +0000 (+0200) Subject: uml: add Kernel 5.15 support via testing X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=e2f0821b5a26bd7ee9d9db93358fa515eca98d1b;p=openwrt%2Fstaging%2Fnbd.git uml: add Kernel 5.15 support via testing Add the latest default Kernel for testing. Signed-off-by: Christian Lamparter --- diff --git a/target/linux/uml/Makefile b/target/linux/uml/Makefile index 5c884fb9a0..90770cc0e4 100644 --- a/target/linux/uml/Makefile +++ b/target/linux/uml/Makefile @@ -14,6 +14,7 @@ BOARDNAME:=User Mode Linux FEATURES:=audio ext4 rootfs-part squashfs KERNEL_PATCHVER:=5.10 +KERNEL_TESTING_PATCHVER:=5.15 include $(INCLUDE_DIR)/target.mk diff --git a/target/linux/uml/README.md b/target/linux/uml/README.md index 63c68db57f..9275f9891b 100644 --- a/target/linux/uml/README.md +++ b/target/linux/uml/README.md @@ -28,7 +28,7 @@ console prompt. If you would like it in xterms, substitute `con=xterm` and `con0=xterm`. **No networking is configured** but it's a starting point. The resulting file system has just enough free space to start kicking the tires and playing in the world of 'embedded routers' along with all the resource -restrictions that come with that world. +restrictions that come with that world. To configure networking and more refer to the *user mode linux* documentation online. A quick start goes along this line. Install the `uml-utilities` diff --git a/target/linux/uml/config-5.15 b/target/linux/uml/config-5.15 new file mode 100644 index 0000000000..549a31e1c6 --- /dev/null +++ b/target/linux/uml/config-5.15 @@ -0,0 +1,141 @@ +CONFIG_3_LEVEL_PGTABLES=y +CONFIG_64BIT=y +CONFIG_ARCH_DMA_ADDR_T_64BIT=y +CONFIG_ARCH_EPHEMERAL_INODES=y +CONFIG_ARCH_NO_PREEMPT=y +CONFIG_ARCH_SUSPEND_POSSIBLE=y +CONFIG_BLK_DEV_COW_COMMON=y +CONFIG_BLK_DEV_LOOP=y +CONFIG_BLK_DEV_UBD=y +CONFIG_BLK_DEV_UBD_SYNC=y +CONFIG_BLK_MQ_VIRTIO=y +CONFIG_CDROM=y +# CONFIG_COMMON_CLK is not set +# CONFIG_COMPAT_32BIT_TIME is not set +CONFIG_CON_CHAN="xterm" +CONFIG_CON_ZERO_CHAN="fd:0,fd:1" +CONFIG_CPU_SUP_AMD=y +CONFIG_CPU_SUP_CENTAUR=y +CONFIG_CPU_SUP_HYGON=y +CONFIG_CPU_SUP_INTEL=y +CONFIG_CPU_SUP_ZHAOXIN=y +CONFIG_CRC16=y +CONFIG_CRYPTO_BLAKE2S=y +CONFIG_CRYPTO_CRC32=y +CONFIG_CRYPTO_CRC32C=y +CONFIG_CRYPTO_LIB_BLAKE2S_GENERIC=y +CONFIG_CRYPTO_LIB_POLY1305_RSIZE=11 +CONFIG_CRYPTO_RNG2=y +CONFIG_CRYPTO_SHA1=y +# CONFIG_CRYPTO_TWOFISH_X86_64 is not set +CONFIG_DEBUG_MEMORY_INIT=y +CONFIG_DECOMPRESS_BZIP2=y +CONFIG_DECOMPRESS_GZIP=y +CONFIG_DNOTIFY=y +# CONFIG_EARLY_PRINTK is not set +CONFIG_EXT4_FS=y +CONFIG_F2FS_FS=y +CONFIG_FAILOVER=y +CONFIG_FS_IOMAP=y +CONFIG_FS_MBCACHE=y +CONFIG_FW_LOADER_PAGED_BUF=y +CONFIG_GENERIC_CLOCKEVENTS=y +# CONFIG_GENERIC_CPU is not set +CONFIG_GENERIC_CPU_DEVICES=y +CONFIG_GENERIC_FIND_FIRST_BIT=y +CONFIG_GENERIC_IRQ_SHOW=y +CONFIG_HOSTFS=y +CONFIG_HVC_DRIVER=y +CONFIG_HW_RANDOM=y +CONFIG_HZ_PERIODIC=y +CONFIG_IA32_FEAT_CTL=y +CONFIG_INITRAMFS_SOURCE="" +CONFIG_INIT_ENV_ARG_LIMIT=128 +CONFIG_IRQ_WORK=y +CONFIG_ISO9660_FS=y +CONFIG_JBD2=y +# CONFIG_JFFS2_FS is not set +CONFIG_KALLSYMS=y +CONFIG_KERNEL_STACK_ORDER=2 +CONFIG_LOCK_DEBUGGING_SUPPORT=y +# CONFIG_MATOM is not set +CONFIG_MAY_HAVE_RUNTIME_DEPS=y +CONFIG_MCONSOLE=y +# CONFIG_MCORE2 is not set +CONFIG_MEMFD_CREATE=y +CONFIG_MIGRATION=y +CONFIG_MK8=y +# CONFIG_MMAPPER is not set +CONFIG_MODULES_USE_ELF_RELA=y +# CONFIG_MPSC is not set +CONFIG_NAMESPACES=y +CONFIG_NEED_PER_CPU_KM=y +CONFIG_NET_FAILOVER=y +# CONFIG_NET_NS is not set +CONFIG_NLS=y +CONFIG_NO_DMA=y +CONFIG_NO_IOMEM=y +CONFIG_NO_IOPORT_MAP=y +CONFIG_NR_CPUS=1 +CONFIG_NULL_CHAN=y +# CONFIG_OF is not set +CONFIG_PGTABLE_LEVELS=3 +CONFIG_PHYS_ADDR_T_64BIT=y +CONFIG_PORT_CHAN=y +CONFIG_POSIX_MQUEUE=y +CONFIG_POSIX_MQUEUE_SYSCTL=y +# CONFIG_PROCESSOR_SELECT is not set +CONFIG_PROC_PAGE_MONITOR=y +CONFIG_PTP_1588_CLOCK_OPTIONAL=y +CONFIG_PTY_CHAN=y +CONFIG_RD_BZIP2=y +CONFIG_RD_GZIP=y +CONFIG_RELAY=y +CONFIG_SG_POOL=y +CONFIG_SOFT_WATCHDOG=m +CONFIG_SRCU=y +CONFIG_SSL=y +CONFIG_SSL_CHAN="pty" +CONFIG_STACKTRACE=y +CONFIG_STDERR_CONSOLE=y +CONFIG_TICK_CPU_ACCOUNTING=y +CONFIG_TINY_SRCU=y +CONFIG_TTY_CHAN=y +CONFIG_UML=y +CONFIG_UML_NET=y +CONFIG_UML_NET_DAEMON=y +CONFIG_UML_NET_DETERMINISTIC_MAC=y +CONFIG_UML_NET_ETHERTAP=y +CONFIG_UML_NET_MCAST=y +# CONFIG_UML_NET_PCAP is not set +CONFIG_UML_NET_SLIP=y +CONFIG_UML_NET_SLIRP=y +CONFIG_UML_NET_TUNTAP=y +# CONFIG_UML_NET_VDE is not set +CONFIG_UML_NET_VECTOR=y +# CONFIG_UML_PCI_OVER_VIRTIO is not set +CONFIG_UML_RANDOM=y +# CONFIG_UML_SOUND is not set +CONFIG_UML_TIME_TRAVEL_SUPPORT=y +CONFIG_UML_WATCHDOG=y +CONFIG_UML_X86=y +# CONFIG_USER_NS is not set +CONFIG_VIRTIO=y +CONFIG_VIRTIO_BLK=y +CONFIG_VIRTIO_CONSOLE=y +CONFIG_VIRTIO_NET=y +CONFIG_VIRTIO_UML=y +CONFIG_VMAP_STACK=y +CONFIG_VM_EVENT_COUNTERS=y +CONFIG_WATCHDOG_CORE=y +CONFIG_X86_64=y +CONFIG_X86_CMOV=y +CONFIG_X86_CMPXCHG64=y +CONFIG_X86_INTEL_USERCOPY=y +CONFIG_X86_INTERNODE_CACHE_SHIFT=6 +CONFIG_X86_L1_CACHE_SHIFT=6 +CONFIG_X86_MINIMUM_CPU_FAMILY=64 +CONFIG_X86_TSC=y +CONFIG_X86_USE_PPRO_CHECKSUM=y +CONFIG_XTERM_CHAN=y +CONFIG_ZLIB_INFLATE=y diff --git a/target/linux/uml/patches-5.15/001-um-fix-default-console-kernel-parameter.patch b/target/linux/uml/patches-5.15/001-um-fix-default-console-kernel-parameter.patch new file mode 100644 index 0000000000..dd7fe57d5f --- /dev/null +++ b/target/linux/uml/patches-5.15/001-um-fix-default-console-kernel-parameter.patch @@ -0,0 +1,54 @@ +From 53b5c5f559cc95fc676cb4cc9e5a8d9f0cb8f58c Mon Sep 17 00:00:00 2001 +Message-Id: <53b5c5f559cc95fc676cb4cc9e5a8d9f0cb8f58c.1659815468.git.chunkeey@gmail.com> +From: Christian Lamparter +Date: Sat, 6 Aug 2022 21:22:01 +0200 +Subject: [PATCH v1 1/2] um: fix default console kernel parameter +To: linux-um@lists.infradead.org +Cc: Richard Weinberger , + Anton Ivanov , + Johannes Berg + +OpenWrt's UML with 5.15 was producing odd errors/warnings during preinit +part of the early userspace portion: + +|[ 0.000000] Kernel command line: ubd0=root.img root=98:0 console=tty +|[...] +|[ 0.440000] random: jshn: uninitialized urandom read (4 bytes read) +|[ 0.460000] random: jshn: uninitialized urandom read (4 bytes read) +|/etc/preinit: line 47: can't create /dev/tty: No such device or address +|/etc/preinit: line 48: can't create /dev/tty: No such device or address +|/etc/preinit: line 58: can't open /dev/tty: No such device or address +|[...] repeated many times + +That "/dev/tty" came from the command line (which is automatically +added if no console= parameter was specified for the uml binary). + +The TLDP project tells the following about the /dev/tty: + +| /dev/tty stands for the controlling terminal (if any) for the current +| process.[...] +| /dev/tty is something like a link to the actually terminal device[..] + +The "(if any)" is important here, since it's possible for processes to +not have a controlling terminal. + +I think this was a simple typo and the author wanted tty0 there. + +CC: Thomas Meyer +Fixes: d7ffac33631b ("um: stdio_console: Make preferred console") +Signed-off-by: Christian Lamparter +--- + arch/um/kernel/um_arch.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +--- a/arch/um/kernel/um_arch.c ++++ b/arch/um/kernel/um_arch.c +@@ -31,7 +31,7 @@ + #include + + #define DEFAULT_COMMAND_LINE_ROOT "root=98:0" +-#define DEFAULT_COMMAND_LINE_CONSOLE "console=tty" ++#define DEFAULT_COMMAND_LINE_CONSOLE "console=tty0" + + /* Changed in add_arg and setup_arch, which run before SMP is started */ + static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 }; diff --git a/target/linux/uml/patches-5.15/101-mconsole-exec.patch b/target/linux/uml/patches-5.15/101-mconsole-exec.patch new file mode 100644 index 0000000000..ceea41e013 --- /dev/null +++ b/target/linux/uml/patches-5.15/101-mconsole-exec.patch @@ -0,0 +1,213 @@ +# +# Minimalist mconsole exec patch +# +# 3.10 version (with bit more synchronous behavior) by fingon at iki dot fi +# Adaptation to kernel 3.3.8 made by David Fernández (david at dit.upm.es) for +# Starting point: mconsole-exec-2.6.30.patch for kernel 2.6.30 +# Author of original patch: Paolo Giarrusso, aka Blaisorblade +# (http://www.user-mode-linux.org/~blaisorblade) +# +# Known misfeatures: +# +# - If output is too long, blocks (and breaks horribly) +# (this misfeature from 3.10 patches, when minimalizing the patch; +# workaround: redirect to a shared filesystem if long output is expected) +# +# - Nothing useful is done with stdin +# +--- a/arch/um/drivers/mconsole.h ++++ b/arch/um/drivers/mconsole.h +@@ -85,6 +85,7 @@ extern void mconsole_cad(struct mc_reque + extern void mconsole_stop(struct mc_request *req); + extern void mconsole_go(struct mc_request *req); + extern void mconsole_log(struct mc_request *req); ++extern void mconsole_exec(struct mc_request *req); + extern void mconsole_proc(struct mc_request *req); + extern void mconsole_stack(struct mc_request *req); + +--- a/arch/um/drivers/mconsole_kern.c ++++ b/arch/um/drivers/mconsole_kern.c +@@ -4,6 +4,7 @@ + * Copyright (C) 2001 - 2008 Jeff Dike (jdike@{addtoit,linux.intel}.com) + */ + ++#include + #include + #include + #include +@@ -27,6 +28,7 @@ + #include + #include + #include ++#include + #include + + #include +@@ -124,6 +126,59 @@ void mconsole_log(struct mc_request *req + mconsole_reply(req, "", 0, 0); + } + ++void mconsole_exec(struct mc_request *req) ++{ ++ struct subprocess_info *sub_info; ++ int res, len; ++ struct file *out; ++ char buf[MCONSOLE_MAX_DATA]; ++ ++ char *envp[] = { ++ "HOME=/", "TERM=linux", ++ "PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin", ++ NULL ++ }; ++ char *argv[] = { ++ "/bin/sh", "-c", ++ req->request.data + strlen("exec "), ++ NULL ++ }; ++ ++ sub_info = call_usermodehelper_setup("/bin/sh", argv, envp, GFP_ATOMIC, NULL, NULL, NULL); ++ if (sub_info == NULL) { ++ mconsole_reply(req, "call_usermodehelper_setup failed", 1, 0); ++ return; ++ } ++ res = call_usermodehelper_stdoutpipe(sub_info, &out); ++ if (res < 0) { ++ kfree(sub_info); ++ mconsole_reply(req, "call_usermodehelper_stdoutpipe failed", 1, 0); ++ return; ++ } ++ ++ res = call_usermodehelper_exec(sub_info, UMH_WAIT_PROC); ++ if (res < 0) { ++ kfree(sub_info); ++ mconsole_reply(req, "call_usermodehelper_exec failed", 1, 0); ++ return; ++ } ++ ++ for (;;) { ++ len = out->f_op->read(out, buf, sizeof(buf), &out->f_pos); ++ if (len < 0) { ++ mconsole_reply(req, "reading output failed", 1, 0); ++ break; ++ } ++ if (len == 0) ++ break; ++ mconsole_reply_len(req, buf, len, 0, 1); ++ } ++ fput(out); ++ ++ mconsole_reply_len(req, NULL, 0, 0, 0); ++} ++ ++ + void mconsole_proc(struct mc_request *req) + { + struct vfsmount *mnt = proc_mnt; +@@ -190,6 +245,7 @@ void mconsole_proc(struct mc_request *re + stop - pause the UML; it will do nothing until it receives a 'go' \n\ + go - continue the UML after a 'stop' \n\ + log - make UML enter into the kernel log\n\ ++ exec - pass to /bin/sh -c synchronously\n\ + proc - returns the contents of the UML's /proc/\n\ + stack - returns the stack of the specified pid\n\ + " +--- a/arch/um/drivers/mconsole_user.c ++++ b/arch/um/drivers/mconsole_user.c +@@ -30,6 +30,7 @@ static struct mconsole_command commands[ + { "stop", mconsole_stop, MCONSOLE_PROC }, + { "go", mconsole_go, MCONSOLE_INTR }, + { "log", mconsole_log, MCONSOLE_INTR }, ++ { "exec", mconsole_exec, MCONSOLE_PROC }, + { "proc", mconsole_proc, MCONSOLE_PROC }, + { "stack", mconsole_stack, MCONSOLE_INTR }, + }; +--- a/arch/um/os-Linux/file.c ++++ b/arch/um/os-Linux/file.c +@@ -560,6 +560,8 @@ int os_create_unix_socket(const char *fi + + addr.sun_family = AF_UNIX; + ++ if (len > sizeof(addr.sun_path)) ++ len = sizeof(addr.sun_path); + snprintf(addr.sun_path, len, "%s", file); + + err = bind(sock, (struct sockaddr *) &addr, sizeof(addr)); +--- a/include/linux/kmod.h ++++ b/include/linux/kmod.h +@@ -32,4 +32,6 @@ static inline int request_module_nowait( + #define try_then_request_module(x, mod...) (x) + #endif + ++int call_usermodehelper_stdoutpipe(struct subprocess_info *sub_info, struct file **filp); ++ + #endif /* __LINUX_KMOD_H__ */ +--- a/include/linux/umh.h ++++ b/include/linux/umh.h +@@ -22,6 +22,7 @@ struct subprocess_info { + const char *path; + char **argv; + char **envp; ++ struct file *stdout; + int wait; + int retval; + int (*init)(struct subprocess_info *info, struct cred *new); +--- a/kernel/umh.c ++++ b/kernel/umh.c +@@ -28,6 +28,7 @@ + #include + #include + #include ++#include + + #include + +@@ -73,6 +74,28 @@ static int call_usermodehelper_exec_asyn + flush_signal_handlers(current, 1); + spin_unlock_irq(¤t->sighand->siglock); + ++ /* Install output when needed */ ++ if (sub_info->stdout) { ++ struct files_struct *f = current->files; ++ struct fdtable *fdt; ++ ++ sys_close(1); ++ sys_close(2); ++ get_file(sub_info->stdout); ++ fd_install(1, sub_info->stdout); ++ fd_install(2, sub_info->stdout); ++ spin_lock(&f->file_lock); ++ fdt = files_fdtable(f); ++ __set_bit(1, fdt->open_fds); ++ __clear_bit(1, fdt->close_on_exec); ++ __set_bit(2, fdt->open_fds); ++ __clear_bit(2, fdt->close_on_exec); ++ spin_unlock(&f->file_lock); ++ ++ /* disallow core files */ ++ current->signal->rlim[RLIMIT_CORE] = (struct rlimit){0, 0}; ++ } ++ + /* + * Initial kernel threads share ther FS with init, in order to + * get the init root directory. But we've now created a new +@@ -332,6 +355,20 @@ static void helper_unlock(void) + wake_up(&running_helpers_waitq); + } + ++int call_usermodehelper_stdoutpipe(struct subprocess_info *sub_info, ++ struct file **filp) ++{ ++ struct file *f[2]; ++ ++ if (create_pipe_files(f, 0) < 0) ++ return PTR_ERR(f); ++ ++ sub_info->stdout = f[1]; ++ *filp = f[0]; ++ return 0; ++} ++EXPORT_SYMBOL(call_usermodehelper_stdoutpipe); ++ + /** + * call_usermodehelper_setup - prepare to call a usermode helper + * @path: path to usermode executable diff --git a/target/linux/uml/patches-5.15/102-pseudo-random-mac.patch b/target/linux/uml/patches-5.15/102-pseudo-random-mac.patch new file mode 100644 index 0000000000..925b9d7710 --- /dev/null +++ b/target/linux/uml/patches-5.15/102-pseudo-random-mac.patch @@ -0,0 +1,147 @@ +=============================================================================== + +This patch makes MAC addresses of network interfaces predictable. In +particular, it adds a small routine that computes MAC addresses of based on +a SHA1 hash of the virtual machine name and interface ID. + +TECHNICAL INFORMATION: + +Applies to vanilla kernel 3.9.4. + +=============================================================================== +--- a/arch/um/drivers/Kconfig ++++ b/arch/um/drivers/Kconfig +@@ -146,6 +146,20 @@ config UML_NET + enable at least one of the following transport options to actually + make use of UML networking. + ++config UML_NET_DETERMINISTIC_MAC ++ bool "Use deterministic MAC addresses for network interfaces" ++ default y ++ depends on UML_NET ++ select CRYPTO_SHA1 ++ help ++ Virtual network devices inside a User-Mode Linux instance must be ++ assigned a MAC (Ethernet) address. If none is specified on the UML ++ command line, one must be automatically computed. If this option is ++ enabled, a randomly generated address is used. Otherwise, if this ++ option is disabled, the address is generated from a SHA1 hash of ++ the umid of the UML instance and the interface name. The latter choice ++ is useful to make MAC addresses predictable. ++ + config UML_NET_ETHERTAP + bool "Ethertap transport (obsolete)" + depends on UML_NET +--- a/arch/um/drivers/net_kern.c ++++ b/arch/um/drivers/net_kern.c +@@ -25,6 +25,14 @@ + #include + #include + ++#include ++#include ++#include ++#include ++#include ++#include ++#include "os.h" ++ + #define DRIVER_NAME "uml-netdev" + + static DEFINE_SPINLOCK(opened_lock); +@@ -274,9 +282,51 @@ static const struct ethtool_ops uml_net_ + .get_ts_info = ethtool_op_get_ts_info, + }; + ++#ifdef CONFIG_UML_NET_DETERMINISTIC_MAC ++ ++/* Compute a SHA1 hash of the UML instance's id and ++ * * an interface name. */ ++static int compute_hash(const char *umid, const char *ifname, char *hash) ++{ ++ struct ahash_request *desc; ++ struct crypto_ahash *tfm; ++ struct scatterlist sg; ++ char vmif[1024]; ++ int ret; ++ ++ strcpy (vmif, umid); ++ strcat (vmif, ifname); ++ ++ tfm = crypto_alloc_ahash("sha1", 0, CRYPTO_ALG_ASYNC); ++ if (IS_ERR(tfm)) ++ return -ENOMEM; ++ ++ desc = ahash_request_alloc(tfm, GFP_KERNEL); ++ if (!desc) { ++ ret = -ENOMEM; ++ goto out; ++ } ++ ++ crypto_ahash_clear_flags(tfm, ~0); ++ ++ sg_init_table(&sg, 1); ++ sg_set_buf(&sg, vmif, strlen(vmif)); ++ ++ ahash_request_set_crypt(desc, &sg, hash, strlen(vmif)); ++ ++ ret = crypto_ahash_digest(desc); ++out: ++ crypto_free_ahash(tfm); ++ ++ return ret; ++} ++ ++#endif ++ + void uml_net_setup_etheraddr(struct net_device *dev, char *str) + { + unsigned char *addr = dev->dev_addr; ++ u8 hash[SHA1_DIGEST_SIZE]; + char *end; + int i; + +@@ -319,9 +369,26 @@ void uml_net_setup_etheraddr(struct net_ + return; + + random: ++#ifndef CONFIG_UML_NET_DETERMINISTIC_MAC + printk(KERN_INFO + "Choosing a random ethernet address for device %s\n", dev->name); + eth_hw_addr_random(dev); ++#else ++ printk(KERN_INFO ++ "Computing a digest to use as ethernet address for device %s\n", dev->name); ++ if (compute_hash(get_umid(), dev->name, hash) < 0) { ++ printk(KERN_WARNING ++ "Could not compute digest to use as ethernet address for device %s. " ++ "Using random address instead.\n", dev->name); ++ random_ether_addr(addr); ++ } ++ else { ++ for (i=0; i < 6; i++) ++ addr[i] = (hash[i] + hash[i+6]) % 0x100; ++ } ++ addr [0] &= 0xfe; /* clear multicast bit */ ++ addr [0] |= 0x02; /* set local assignment bit (IEEE802) */ ++#endif + } + + static DEFINE_SPINLOCK(devices_lock); +--- a/kernel/umh.c ++++ b/kernel/umh.c +@@ -356,12 +356,12 @@ static void helper_unlock(void) + } + + int call_usermodehelper_stdoutpipe(struct subprocess_info *sub_info, +- struct file **filp) ++ struct file **filp) + { + struct file *f[2]; + + if (create_pipe_files(f, 0) < 0) +- return PTR_ERR(f); ++ return PTR_ERR(f); + + sub_info->stdout = f[1]; + *filp = f[0]; diff --git a/target/linux/uml/patches-5.15/104-um-increase-default-virtual-physical-memory-to-64.patch b/target/linux/uml/patches-5.15/104-um-increase-default-virtual-physical-memory-to-64.patch new file mode 100644 index 0000000000..3a67a7dbd0 --- /dev/null +++ b/target/linux/uml/patches-5.15/104-um-increase-default-virtual-physical-memory-to-64.patch @@ -0,0 +1,40 @@ +From d7936f11aded13f03871c0d6502d611d6a1e2dc5 Mon Sep 17 00:00:00 2001 +Message-Id: +In-Reply-To: <53b5c5f559cc95fc676cb4cc9e5a8d9f0cb8f58c.1659815468.git.chunkeey@gmail.com> +References: <53b5c5f559cc95fc676cb4cc9e5a8d9f0cb8f58c.1659815468.git.chunkeey@gmail.com> +From: Christian Lamparter +Date: Sat, 6 Aug 2022 19:27:20 +0200 +Subject: [PATCH v1 2/2] um: increase default virtual physical memory to 64 MiB +To: linux-um@lists.infradead.org +Cc: Richard Weinberger , + Anton Ivanov , + Johannes Berg + +The current 32 MiB of RAM causes OOMs to appear shortly after +booting in a minimal OpenWrt 22.03 configuration with a +5.10.134 kernel. + +Of course, passing a "mem=64M" (from the --help text) parameter +works too, but it produces the following (info) message: + +| [ 0.000000] Unknown kernel command line parameters "mem=64M", will be passed to user space. + +That's why, I think it would be nicer, if this is working out +of the box again :). + +Signed-off-by: Christian Lamparter +--- + arch/um/kernel/um_arch.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +--- a/arch/um/kernel/um_arch.c ++++ b/arch/um/kernel/um_arch.c +@@ -130,7 +130,7 @@ static int have_root __initdata; + static int have_console __initdata; + + /* Set in uml_mem_setup and modified in linux_main */ +-long long physmem_size = 32 * 1024 * 1024; ++long long physmem_size = 64 * 1024 * 1024; + EXPORT_SYMBOL(physmem_size); + + static const char *usage_string =