diff options
| author | Johannes Weiner <hannes@cmpxchg.org> | 2009-06-19 19:30:56 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-20 16:08:22 -0700 |
| commit | c277331d5fbaae5772ed19862feefa91f4e477d3 (patch) | |
| tree | fcd980b58d9487421e9b0c45b7c082fa1302debb /mm/page_alloc.c | |
| parent | 9063c61fd5cbd6f42e95929aa0e02380c9e15656 (diff) | |
| download | lwn-c277331d5fbaae5772ed19862feefa91f4e477d3.tar.gz lwn-c277331d5fbaae5772ed19862feefa91f4e477d3.zip | |
mm: page_alloc: clear PG_locked before checking flags on free
da456f1 "page allocator: do not disable interrupts in free_page_mlock()" moved
the PG_mlocked clearing after the flag sanity checking which makes mlocked
pages always trigger 'bad page'. Fix this by clearing the bit up front.
Reported--and-debugged-by: Peter Chubb <peter.chubb@nicta.com.au>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Tested-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 6f0753fe694c..30d5093a099d 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -488,7 +488,6 @@ static inline void __free_one_page(struct page *page, */ static inline void free_page_mlock(struct page *page) { - __ClearPageMlocked(page); __dec_zone_page_state(page, NR_MLOCK); __count_vm_event(UNEVICTABLE_MLOCKFREED); } @@ -558,7 +557,7 @@ static void __free_pages_ok(struct page *page, unsigned int order) unsigned long flags; int i; int bad = 0; - int clearMlocked = PageMlocked(page); + int wasMlocked = TestClearPageMlocked(page); kmemcheck_free_shadow(page, order); @@ -576,7 +575,7 @@ static void __free_pages_ok(struct page *page, unsigned int order) kernel_map_pages(page, 1 << order, 0); local_irq_save(flags); - if (unlikely(clearMlocked)) + if (unlikely(wasMlocked)) free_page_mlock(page); __count_vm_events(PGFREE, 1 << order); free_one_page(page_zone(page), page, order, @@ -1022,7 +1021,7 @@ static void free_hot_cold_page(struct page *page, int cold) struct zone *zone = page_zone(page); struct per_cpu_pages *pcp; unsigned long flags; - int clearMlocked = PageMlocked(page); + int wasMlocked = TestClearPageMlocked(page); kmemcheck_free_shadow(page, 0); @@ -1041,7 +1040,7 @@ static void free_hot_cold_page(struct page *page, int cold) pcp = &zone_pcp(zone, get_cpu())->pcp; set_page_private(page, get_pageblock_migratetype(page)); local_irq_save(flags); - if (unlikely(clearMlocked)) + if (unlikely(wasMlocked)) free_page_mlock(page); __count_vm_event(PGFREE); |