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HWPOISON: comment the possible set_page_dirty() race

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Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
This commit is contained in:
Wu Fengguang 2009-12-16 12:19:58 +01:00 • committed by Andi Kleen
commit db0480b3a6
1 changed files with 2 additions and 0 deletions
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2
mm/memory-failure.c
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@ -687,6 +687,8 @@ static int hwpoison_user_mappings(struct page *p, unsigned long pfn,
/*
* Propagate the dirty bit from PTEs to struct page first, because we
* need this to decide if we should kill or just drop the page.
* XXX: the dirty test could be racy: set_page_dirty() may not always
* be called inside page lock (it's recommended but not enforced).
*/
mapping = page_mapping(p);
if (!PageDirty(p) && mapping && mapping_cap_writeback_dirty(mapping)) {