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mm/hugetlb.c: add missing spin_lock() to hugetlb_cow() 

Add missing spin_lock() of the page_table_lock before an error return in
hugetlb_cow(). Callers of hugtelb_cow() expect it to be held upon return.

Signed-off-by: Dean Nelson <dnelson@redhat.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dean Nelson 2010-10-26 14:22:08 -07:00 committed by Linus Torvalds
parent 70384dc6dc
commit 44e2aa937e
1 changed files with 4 additions and 1 deletions
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5
mm/hugetlb.c
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@ -2448,8 +2448,11 @@ static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,
* When the original hugepage is shared one, it does not have
* anon_vma prepared.
*/
if (unlikely(anon_vma_prepare(vma)))
if (unlikely(anon_vma_prepare(vma))) {
/* Caller expects lock to be held */
spin_lock(&mm->page_table_lock);
return VM_FAULT_OOM;
}
copy_user_huge_page(new_page, old_page, address, vma);
__SetPageUptodate(new_page);