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[PATCH] Fix buddy list race that could lead to page lru list corruptions
Rohit found an obscure bug causing buddy list corruption. page_is_buddy is using a non-atomic test (PagePrivate && page_count == 0) to determine whether or not a free page's buddy is itself free and in the buddy lists. Each of the conjuncts may be true at different times due to unrelated conditions, so the non-atomic page_is_buddy test may find each conjunct to be true even if they were not both true at the same time (ie. the page was not on the buddy lists). Signed-off-by: Martin Bligh <[email protected]> Signed-off-by: Rohit Seth <[email protected]> Signed-off-by: Nick Piggin <[email protected]> Signed-off-by: KAMEZAWA Hiroyuki <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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Nick Piggin
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Linus Torvalds
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Apr 10, 2006
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