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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2017-11-27 06:21:25 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-05 11:24:31 +0100 |
| commit | 7031ae2ab37d3df53c4a4e9903329a5d38c745ec (patch) | |
| tree | e7fafecee20f76d05b16581c92b2c2966ff7d063 /mm/mm_init.c | |
| parent | 29bd7003134a3220119e7a75c4b06ac567f966e7 (diff) | |
mm, thp: Do not make page table dirty unconditionally in touch_p[mu]d()
commit a8f97366452ed491d13cf1e44241bc0b5740b1f0 upstream.
Currently, we unconditionally make page table dirty in touch_pmd().
It may result in false-positive can_follow_write_pmd().
We may avoid the situation, if we would only make the page table entry
dirty if caller asks for write access -- FOLL_WRITE.
The patch also changes touch_pud() in the same way.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[Salvatore Bonaccorso: backport for 4.9:
- Adjust context
- Drop specific part for PUD-sized transparent hugepages. Support
for PUD-sized transparent hugepages was added in v4.11-rc1
]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/mm_init.c')
0 files changed, 0 insertions, 0 deletions