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authorDavidlohr Bueso <davidlohr@hp.com>2014-08-06 16:06:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-06 18:01:19 -0700
commit2f4612af43d4854c892f5ef8ed7a98b6492aee44 (patch)
tree4c8534fb31083bb59f225124f252abd7fa8a3486 /mm
parenteb39d618f9e80f81cfc5788cf1b252d141c2f0c3 (diff)
downloadlinux-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')
-rw-r--r--mm/hugetlb.c32
1 files changed, 14 insertions, 18 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 7a0a73d2fcff..b94752ae791b 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 */