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| author | Andrea Arcangeli <aarcange@redhat.com> | 2016-05-20 16:58:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-05-20 17:58:30 -0700 |
| commit | d5ee7c3bcca6fe2b4f7a1fdee253250059c110d2 (patch) | |
| tree | d1b2f245f77336b93fa227b0f22d9c941c8adac7 | |
| parent | 5f527c2b3ea261bfccb7d12f9feade924cc4987c (diff) | |
| download | linux-d5ee7c3bcca6fe2b4f7a1fdee253250059c110d2.tar.gz linux-d5ee7c3bcca6fe2b4f7a1fdee253250059c110d2.tar.xz | |
mm: thp: split_huge_pmd_address() comment improvement
Comment is partly wrong, this improves it by including the case of
split_huge_pmd_address() called by try_to_unmap_one if TTU_SPLIT_HUGE_PMD
is set.
Link: http://lkml.kernel.org/r/1462547040-1737-4-git-send-email-aarcange@redhat.com
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/huge_memory.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 86eafd91c982..1764184c4774 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -3023,8 +3023,10 @@ void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address, return; /* - * Caller holds the mmap_sem write mode, so a huge pmd cannot - * materialize from under us. + * Caller holds the mmap_sem write mode or the anon_vma lock, + * so a huge pmd cannot materialize from under us (khugepaged + * holds both the mmap_sem write mode and the anon_vma lock + * write mode). */ __split_huge_pmd(vma, pmd, address, freeze); } |