drivers/xen: make [xen-]ballon explicitly non-modular

The Makefile / Kconfig currently controlling compilation here is:

obj-y   += grant-table.o features.o balloon.o manage.o preempt.o time.o
[...]
obj-$(CONFIG_XEN_BALLOON)               += xen-balloon.o

...with:

drivers/xen/Kconfig:config XEN_BALLOON
drivers/xen/Kconfig:    bool "Xen memory balloon driver"

...meaning that they currently are not being built as modules by anyone.

Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.

In doing so we uncover two implict includes that were obtained
by module.h having such a wide include scope itself:

In file included from drivers/xen/xen-balloon.c:41:0:
include/xen/balloon.h:26:51: warning: ‘struct page’ declared inside parameter list [enabled by default]
 int alloc_xenballooned_pages(int nr_pages, struct page **pages);
                                                   ^
include/xen/balloon.h: In function ‘register_xen_selfballooning’:
include/xen/balloon.h:35:10: error: ‘ENOSYS’ undeclared (first use in this function)
  return -ENOSYS;
          ^

This is fixed by adding mm-types.h and errno.h to the list.

We also delete the MODULE_LICENSE tags since all that information
is already contained at the top of the file in the comments.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 12eab503efd1bb8793fff55eca83649e1f564426..481c3f86033a82f433bd5cf9b7c23f80039c5589 100644 (file)
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -42,7 +42,6 @@
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/errno.h>
-#include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/bootmem.h>
 #include <linux/pagemap.h>
@@ -751,7 +750,4 @@ static int __init balloon_init(void)
 
        return 0;
 }
-
 subsys_initcall(balloon_init);
-
-MODULE_LICENSE("GPL");

diff --git a/drivers/xen/xen-balloon.c b/drivers/xen/xen-balloon.c
index 39e7ef8d39579e12f3912571ce6fb832e503ee77..79865b8901baa29cf9427eb2237fad364c44bb31 100644 (file)
--- a/drivers/xen/xen-balloon.c
+++ b/drivers/xen/xen-balloon.c
@@ -33,7 +33,9 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/kernel.h>
-#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/mm_types.h>
+#include <linux/init.h>
 #include <linux/capability.h>
 
 #include <xen/xen.h>
@@ -109,14 +111,6 @@ static int __init balloon_init(void)
 }
 subsys_initcall(balloon_init);
 
-static void balloon_exit(void)
-{
-    /* XXX - release balloon here */
-    return;
-}
-
-module_exit(balloon_exit);
-
 #define BALLOON_SHOW(name, format, args...)                            \
        static ssize_t show_##name(struct device *dev,                  \
                                   struct device_attribute *attr,       \
@@ -250,5 +244,3 @@ static int register_balloon(struct device *dev)
 
        return 0;
 }
-
-MODULE_LICENSE("GPL");