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| author | Hugh Dickins <hugh@veritas.com> | 2006-02-01 03:05:31 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-01 08:53:15 -0800 |
| commit | 4e6a510a74145585f4111d60d1b5fd450d795dd8 (patch) | |
| tree | ff1cb5ba871d6c3f1b90276b865853e20cddefff /fs/hugetlbfs | |
| parent | 9884fd8df195fe48d4e1be2279b419be96127cae (diff) | |
| download | lwn-4e6a510a74145585f4111d60d1b5fd450d795dd8.tar.gz lwn-4e6a510a74145585f4111d60d1b5fd450d795dd8.zip | |
[PATCH] mm: hugepage accounting fix
2.6.15's hugepage faulting introduced huge_pages_needed accounting into
hugetlbfs: to count how many pages are already in cache, for spot check on
how far a new mapping may be allowed to extend the file. But it's muddled:
each hugepage found covers HPAGE_SIZE, not PAGE_SIZE. Once pages were
already in cache, it would overshoot, wrap its hugepages count backwards,
and so fail a harmless repeat mapping with -ENOMEM. Fixes the problem
found by Don Dupuis.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Acked-By: Adam Litke <agl@us.ibm.com>
Acked-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/hugetlbfs')
| -rw-r--r-- | fs/hugetlbfs/inode.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index f568102da1e8..b35195289945 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -72,8 +72,8 @@ huge_pages_needed(struct address_space *mapping, struct vm_area_struct *vma) unsigned long start = vma->vm_start; unsigned long end = vma->vm_end; unsigned long hugepages = (end - start) >> HPAGE_SHIFT; - pgoff_t next = vma->vm_pgoff; - pgoff_t endpg = next + ((end - start) >> PAGE_SHIFT); + pgoff_t next = vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT); + pgoff_t endpg = next + hugepages; pagevec_init(&pvec, 0); while (next < endpg) { |