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| author | Davidlohr Bueso <davidlohr@hp.com> | 2014-08-06 16:06:45 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-08-06 18:01:19 -0700 |
| commit | 2f4612af43d4854c892f5ef8ed7a98b6492aee44 (patch) | |
| tree | 4c8534fb31083bb59f225124f252abd7fa8a3486 /mm/hugetlb.c | |
| parent | eb39d618f9e80f81cfc5788cf1b252d141c2f0c3 (diff) | |
| download | op-kernel-dev-2f4612af43d4854c892f5ef8ed7a98b6492aee44.zip op-kernel-dev-2f4612af43d4854c892f5ef8ed7a98b6492aee44.tar.gz | |
mm,hugetlb: make unmap_ref_private() return void
This function always returns 1, thus no need to check return value in
hugetlb_cow(). By doing so, we can get rid of the unnecessary WARN_ON
call. While this logic perhaps existed as a way of identifying future
unmap_ref_private() mishandling, reality is it serves no apparent
purpose.
Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Cc: Aswin Chandramouleeswaran <aswin@hp.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 32 |
1 files changed, 14 insertions, 18 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 7a0a73d..b94752a 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -2754,8 +2754,8 @@ void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, * from other VMAs and let the children be SIGKILLed if they are faulting the * same region. */ -static int unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma, - struct page *page, unsigned long address) +static void unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma, + struct page *page, unsigned long address) { struct hstate *h = hstate_vma(vma); struct vm_area_struct *iter_vma; @@ -2794,8 +2794,6 @@ static int unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma, address + huge_page_size(h), page); } mutex_unlock(&mapping->i_mmap_mutex); - - return 1; } /* @@ -2857,20 +2855,18 @@ retry_avoidcopy: */ if (outside_reserve) { BUG_ON(huge_pte_none(pte)); - if (unmap_ref_private(mm, vma, old_page, address)) { - BUG_ON(huge_pte_none(pte)); - spin_lock(ptl); - ptep = huge_pte_offset(mm, address & huge_page_mask(h)); - if (likely(ptep && - pte_same(huge_ptep_get(ptep), pte))) - goto retry_avoidcopy; - /* - * race occurs while re-acquiring page table - * lock, and our job is done. - */ - return 0; - } - WARN_ON_ONCE(1); + unmap_ref_private(mm, vma, old_page, address); + BUG_ON(huge_pte_none(pte)); + spin_lock(ptl); + ptep = huge_pte_offset(mm, address & huge_page_mask(h)); + if (likely(ptep && + pte_same(huge_ptep_get(ptep), pte))) + goto retry_avoidcopy; + /* + * race occurs while re-acquiring page table + * lock, and our job is done. + */ + return 0; } /* Caller expects lock to be held */ |
