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authorPeter Feiner <pfeiner@google.com>2014-09-25 16:05:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-09-26 08:10:35 -0700
commit87e6d49a000fa6148bd539f632706b02c3485c5d (patch)
tree9d848bb2f91295314dfb423485879cbffb4ad101 /fs/btrfs
parent5760a97c7143c208fa3a8f8cad0ed7dd672ebd28 (diff)
downloadop-kernel-dev-87e6d49a000fa6148bd539f632706b02c3485c5d.zip
op-kernel-dev-87e6d49a000fa6148bd539f632706b02c3485c5d.tar.gz
mm: softdirty: addresses before VMAs in PTE holes aren't softdirty
In PTE holes that contain VM_SOFTDIRTY VMAs, unmapped addresses before VM_SOFTDIRTY VMAs are reported as softdirty by /proc/pid/pagemap. This bug was introduced in commit 68b5a6524856 ("mm: softdirty: respect VM_SOFTDIRTY in PTE holes"). That commit made /proc/pid/pagemap look at VM_SOFTDIRTY in PTE holes but neglected to observe the start of VMAs returned by find_vma. Tested: Wrote a selftest that creates a PMD-sized VMA then unmaps the first page and asserts that the page is not softdirty. I'm going to send the pagemap selftest in a later commit. Signed-off-by: Peter Feiner <pfeiner@google.com> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Hugh Dickins <hughd@google.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Jamie Liu <jamieliu@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/btrfs')
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