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05 April 2024, 19:05:47 UTC
Revision 87e6d49a000fa6148bd539f632706b02c3485c5d authored by Peter Feiner on 25 September 2014, 23:05:18 UTC, committed by Linus Torvalds on 26 September 2014, 15:10:35 UTC 
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>
1 parent 5760a97
History
Tip revision: 87e6d49a000fa6148bd539f632706b02c3485c5d authored by Peter Feiner on 25 September 2014, 23:05:18 UTC
mm: softdirty: addresses before VMAs in PTE holes aren't softdirty
Tip revision: 87e6d49
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.gitignore -rw-r--r-- 1.1 KB
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