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authorCaspar Zhang <caspar@casparzhang.com>2011-09-15 01:20:58 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2011-09-15 03:09:36 +0200
commit8aacc9f550feb09c8b26470498345c192996a68e (patch)
treec55adebcb37152e9a504696d468adb0b852d4f04 /mm/memcontrol.c
parentMerge git://bedivere.hansenpartnership.com/git/scsi-rc-fixes-2.6 (diff)
downloadlinux-8aacc9f550feb09c8b26470498345c192996a68e.tar.xz
linux-8aacc9f550feb09c8b26470498345c192996a68e.zip
mm/mempolicy.c: fix pgoff in mbind vma merge
commit 9d8cebd4bcd7 ("mm: fix mbind vma merge problem") didn't really fix the mbind vma merge problem due to wrong pgoff value passing to vma_merge(), which made vma_merge() always return NULL. Before the patch applied, we are getting a result like: addr = 0x7fa58f00c000 [snip] 7fa58f00c000-7fa58f00d000 rw-p 00000000 00:00 0 7fa58f00d000-7fa58f00e000 rw-p 00000000 00:00 0 7fa58f00e000-7fa58f00f000 rw-p 00000000 00:00 0 here 7fa58f00c000->7fa58f00f000 we get 3 VMAs which are expected to be merged described as described in commit 9d8cebd. Re-testing the patched kernel with the reproducer provided in commit 9d8cebd, we get the correct result: addr = 0x7ffa5aaa2000 [snip] 7ffa5aaa2000-7ffa5aaa6000 rw-p 00000000 00:00 0 7fffd556f000-7fffd5584000 rw-p 00000000 00:00 0 [stack] Signed-off-by: Caspar Zhang <caspar@casparzhang.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: Minchan Kim <minchan.kim@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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