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authorAndrea Arcangeli <aarcange@redhat.com>2016-05-21 02:58:27 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-21 03:58:30 +0300
commitd5ee7c3bcca6fe2b4f7a1fdee253250059c110d2 (patch)
treed1b2f245f77336b93fa227b0f22d9c941c8adac7 /mm/huge_memory.c
parent5f527c2b3ea261bfccb7d12f9feade924cc4987c (diff)
downloadlinux-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>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r--mm/huge_memory.c6
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);
}