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authorAdam Litke <agl@us.ibm.com>2008-03-10 21:43:50 +0300
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-03-11 04:01:19 +0300
commit2668db9111bb1a6ab5a54f41f703179f35c7d098 (patch)
treebde940cfd298321663cf988b607151513c801a1a /mm/swap.c
parent842078054da2d754c6b998b116d7c468abbfaaca (diff)
downloadlinux-2668db9111bb1a6ab5a54f41f703179f35c7d098.tar.xz
hugetlb: correct page count for surplus huge pages
Free pages in the hugetlb pool are free and as such have a reference count of zero. Regular allocations into the pool from the buddy are "freed" into the pool which results in their page_count dropping to zero. However, surplus pages can be directly utilized by the caller without first being freed to the pool. Therefore, a call to put_page_testzero() is in order so that such a page will be handed to the caller with a correct count. This has not affected end users because the bad page count is reset before the page is handed off. However, under CONFIG_DEBUG_VM this triggers a BUG when the page count is validated. Thanks go to Mel for first spotting this issue and providing an initial fix. Signed-off-by: Adam Litke <agl@us.ibm.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Dave Hansen <haveblue@us.ibm.com> Cc: William Lee Irwin III <wli@holomorphy.com> Cc: Andy Whitcroft <apw@shadowen.org> Cc: Mel Gorman <mel@csn.ul.ie> Cc: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/swap.c')
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