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author | Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2016-07-26 15:24:03 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-26 16:19:19 -0700 |
commit | 337d9abf1cd1a59645d91b6d0b1685a476b81978 (patch) | |
tree | aace71b1608dfbde1c4c35bd03cbdac60fe1f64a /mm/gup.c | |
parent | e3a2713c3cfa9c41fac57447533079d8da23319b (diff) | |
download | linux-337d9abf1cd1a59645d91b6d0b1685a476b81978.tar.gz |
mm: thp: check pmd_trans_unstable() after split_huge_pmd()
split_huge_pmd() doesn't guarantee that the pmd is normal pmd pointing to pte entries, which can be checked with pmd_trans_unstable(). Some callers make this assertion and some do it differently and some not, so let's do it in a unified manner. Link: http://lkml.kernel.org/r/1464741400-12143-1-git-send-email-n-horiguchi@ah.jp.nec.com Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Hugh Dickins <hughd@google.com> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/gup.c')
-rw-r--r-- | mm/gup.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/gup.c b/mm/gup.c index c057784c8444..dee142e100f4 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -279,6 +279,8 @@ struct page *follow_page_mask(struct vm_area_struct *vma, spin_unlock(ptl); ret = 0; split_huge_pmd(vma, pmd, address); + if (pmd_trans_unstable(pmd)) + ret = -EBUSY; } else { get_page(page); spin_unlock(ptl); |