mm: define a UNIQUE value for AS_UNEVICTABLE flag (9a896c9a) · Commits · 戴 / test

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>

include/linux/pagemap.h

+8 −4

Original line number	Diff line number	Diff line
		@@ -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)
		{

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