xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

badpage: simplify page_alloc flag check+clear

Browse Source 
Simplify the PAGE_FLAGS checking and clearing when freeing and allocating
a page: check the same flags as before when freeing, clear ALL the flags
(unless PageReserved) when freeing, check ALL flags off when allocating.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins
2009-01-06 14:40:05 -08:00
committed by Linus Torvalds
parent 0f64415d42
commit 79f4b7bf39
2 changed files with 14 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
include/linux/page-flags.h
View File

@@ -373,31 +373,22 @@ static inline void __ClearPageTail(struct page *page)
#define __PG_MLOCKED 0
#endif
#define PAGE_FLAGS (1 << PG_lru | 1 << PG_private | 1 << PG_locked | \
1 << PG_buddy | 1 << PG_writeback | \
1 << PG_slab | 1 << PG_swapcache | 1 << PG_active | \
__PG_UNEVICTABLE | __PG_MLOCKED)
/*
* Flags checked in bad_page(). Pages on the free list should not have
* these flags set. It they are, there is a problem.
*/
#define PAGE_FLAGS_CLEAR_WHEN_BAD (PAGE_FLAGS | \
1 << PG_reclaim | 1 << PG_dirty | 1 << PG_swapbacked)
/*
* Flags checked when a page is freed. Pages being freed should not have
* these flags set. It they are, there is a problem.
*/
#define PAGE_FLAGS_CHECK_AT_FREE (PAGE_FLAGS | 1 << PG_reserved)
#define PAGE_FLAGS_CHECK_AT_FREE \
(1 << PG_lru | 1 << PG_private | 1 << PG_locked | \
1 << PG_buddy | 1 << PG_writeback | 1 << PG_reserved | \
1 << PG_slab | 1 << PG_swapcache | 1 << PG_active | \
__PG_UNEVICTABLE | __PG_MLOCKED)
/*
* Flags checked when a page is prepped for return by the page allocator.
* Pages being prepped should not have these flags set. It they are, there
* is a problem.
* Pages being prepped should not have any flags set. It they are set,
* there has been a kernel bug or struct page corruption.
*/
#define PAGE_FLAGS_CHECK_AT_PREP (PAGE_FLAGS | \
1 << PG_reserved | 1 << PG_dirty | 1 << PG_swapbacked)
#define PAGE_FLAGS_CHECK_AT_PREP ((1 << NR_PAGEFLAGS) - 1)
#endif /* !__GENERATING_BOUNDS_H */
#endif /* PAGE_FLAGS_H */