Messages in this thread Patch in this message | | | Date | Tue, 20 Dec 2011 21:45:51 +0800 | Subject | [PATCH] mm: hugetlb: fix pgoff computation when unmapping page from vma | From | Hillf Danton <> |
| |
The computation for pgoff is incorrect, at least with
(vma->vm_pgoff >> PAGE_SHIFT)
involved. It is fixed with the available method if HPAGE_SIZE is concerned in page cache lookup.
Cc: Michal Hocko <mhocko@suse.cz> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Hillf Danton <dhillf@gmail.com> ---
--- a/mm/hugetlb.c Tue Dec 20 21:26:30 2011 +++ b/mm/hugetlb.c Tue Dec 20 21:40:44 2011 @@ -2315,8 +2315,7 @@ static int unmap_ref_private(struct mm_s * from page cache lookup which is in HPAGE_SIZE units. */ address = address & huge_page_mask(h); - pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) - + (vma->vm_pgoff >> PAGE_SHIFT); + pgoff = linear_hugepage_index(vma, address); mapping = (struct address_space *)page_private(page);
/*
| |