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mm/vmscan.c: fix mapping use after free
We need lock_page_nosync() here because we have no reference to the mapping when taking the page lock. Signed-off-by: Nick Piggin <email@example.com> Reviewed-by: Johannes Weiner <firstname.lastname@example.org> Cc: Mel Gorman <email@example.com> Signed-off-by: Andrew Morton <firstname.lastname@example.org> Signed-off-by: Linus Torvalds <email@example.com>
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