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[PATCH] fix extra page ref count in follow_hugetlb_page

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git-commit: d5d4b0aa4e
"[PATCH] optimize follow_hugetlb_page" breaks mlock on hugepage areas.

I mis-interpret pages argument and made get_page() unconditional.  It
should only get a ref count when "pages" argument is non-null.

Credit goes to Adam Litke who spotted the bug.

Signed-off-by: Ken Chen <[email protected]>
Acked-by: Adam Litke <[email protected]>
Cc: David Gibson <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Chen, Kenneth W 2006-03-31 02:29:57 -08:00 • committed by Linus Torvalds
commit d6692183ac
1 changed files with 3 additions and 2 deletions
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5
mm/hugetlb.c
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@ -697,9 +697,10 @@ int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
pfn_offset = (vaddr & ~HPAGE_MASK) >> PAGE_SHIFT;
page = pte_page(*pte);
same_page:
get_page(page);
if (pages)
if (pages) {
get_page(page);
pages[i] = page + pfn_offset;
}
if (vmas)
vmas[i] = vma;