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mm: thp: split_huge_pmd_address() comment improvement

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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>
This commit is contained in:
Andrea Arcangeli 2016-05-20 16:58:27 -07:00 committed by Linus Torvalds
parent 5f527c2b3e
commit d5ee7c3bcc
1 changed files with 4 additions and 2 deletions
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6
mm/huge_memory.c
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@ -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);
}