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authorLee Schermerhorn <Lee.Schermerhorn@hp.com>2009-04-02 16:56:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-02 19:04:49 -0700
commit9a896c9a48ac6704c0ce8ee081b836644d0afe40 (patch)
tree681a5453326641cef362a53fb8e031af55ebc87d
parent8e2c3795c78d5c4e2e1f14ce751e9d08decbe9d3 (diff)
mm: define a UNIQUE value for AS_UNEVICTABLE flag
A new "address_space flag"--AS_MM_ALL_LOCKS--was defined to use the next available AS flag while the Unevictable LRU was under development. The Unevictable LRU was using the same flag and "no one" noticed. Current mainline, since 2.6.28, has same value for two symbolic flag names. So, define a unique flag value for AS_UNEVICTABLE--up close to the other flags, [at the cost of an additional #ifdef] so we'll notice next time. Note that #ifdef is not actually required, if we don't mind having the unused flag value defined. Replace #defines with an enum. Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: <stable@kernel.org> [2.6.28.x, 2.6.29.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/pagemap.h12
1 files changed, 8 insertions, 4 deletions
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 01ca0856caf..076a7dc67c2 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -18,9 +18,14 @@
* Bits in mapping->flags. The lower __GFP_BITS_SHIFT bits are the page
* allocation mode flags.
*/
-#define AS_EIO (__GFP_BITS_SHIFT + 0) /* IO error on async write */
-#define AS_ENOSPC (__GFP_BITS_SHIFT + 1) /* ENOSPC on async write */
-#define AS_MM_ALL_LOCKS (__GFP_BITS_SHIFT + 2) /* under mm_take_all_locks() */
+enum mapping_flags {
+ AS_EIO = __GFP_BITS_SHIFT + 0, /* IO error on async write */
+ AS_ENOSPC = __GFP_BITS_SHIFT + 1, /* ENOSPC on async write */
+ AS_MM_ALL_LOCKS = __GFP_BITS_SHIFT + 2, /* under mm_take_all_locks() */
+#ifdef CONFIG_UNEVICTABLE_LRU
+ AS_UNEVICTABLE = __GFP_BITS_SHIFT + 3, /* e.g., ramdisk, SHM_LOCK */
+#endif
+};
static inline void mapping_set_error(struct address_space *mapping, int error)
{
@@ -33,7 +38,6 @@ static inline void mapping_set_error(struct address_space *mapping, int error)
}
#ifdef CONFIG_UNEVICTABLE_LRU
-#define AS_UNEVICTABLE (__GFP_BITS_SHIFT + 2) /* e.g., ramdisk, SHM_LOCK */
static inline void mapping_set_unevictable(struct address_space *mapping)
{