diff options
| author | Chen, Kenneth W <kenneth.w.chen@intel.com> | 2006-03-31 02:29:57 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-31 12:18:49 -0800 |
| commit | d6692183ac1d8f4a4e4015f9ce9acc2514618e0b (patch) | |
| tree | 15d930c84cc93df5bc53ed29290abd46c3135272 /mm/hugetlb.c | |
| parent | 93fac7041f082297b93655a0e49f659cd7520e40 (diff) | |
| download | lwn-d6692183ac1d8f4a4e4015f9ce9acc2514618e0b.tar.gz lwn-d6692183ac1d8f4a4e4015f9ce9acc2514618e0b.zip | |
[PATCH] fix extra page ref count in follow_hugetlb_page
git-commit: d5d4b0aa4e1430d73050babba999365593bdb9d2
"[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 <kenneth.w.chen@intel.com>
Acked-by: Adam Litke <agl@us.ibm.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index ebad6bbb3501..d87885eb4acc 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -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; |