summaryrefslogtreecommitdiffstats
path: root/mm/mremap.c
diff options
context:
space:
mode:
authorMichal Hocko <mhocko@suse.cz>2012-10-08 16:33:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-09 16:22:57 +0900
commit36e4f20af833d1ce196e6a4ade05dc26c44652d1 (patch)
tree122f06a7e2f54e782d4eb765f48217a5d0333226 /mm/mremap.c
parent027ef6c87853b0a9df53175063028edb4950d476 (diff)
downloadop-kernel-dev-36e4f20af833d1ce196e6a4ade05dc26c44652d1.zip
op-kernel-dev-36e4f20af833d1ce196e6a4ade05dc26c44652d1.tar.gz
hugetlb: do not use vma_hugecache_offset() for vma_prio_tree_foreach
Commit 0c176d52b0b2 ("mm: hugetlb: fix pgoff computation when unmapping page from vma") fixed pgoff calculation but it has replaced it by vma_hugecache_offset() which is not approapriate for offsets used for vma_prio_tree_foreach() because that one expects index in page units rather than in huge_page_shift. Johannes said: : The resulting index may not be too big, but it can be too small: assume : hpage size of 2M and the address to unmap to be 0x200000. This is regular : page index 512 and hpage index 1. If you have a VMA that maps the file : only starting at the second huge page, that VMAs vm_pgoff will be 512 but : you ask for offset 1 and miss it even though it does map the page of : interest. hugetlb_cow() will try to unmap, miss the vma, and retry the : cow until the allocation succeeds or the skipped vma(s) go away. Signed-off-by: Michal Hocko <mhocko@suse.cz> Acked-by: Hillf Danton <dhillf@gmail.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: David Rientjes <rientjes@google.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mremap.c')
0 files changed, 0 insertions, 0 deletions
OpenPOWER on IntegriCloud