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| author | Steven J. Magnani <steve@digidescorp.com> | 2010-03-05 13:42:24 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-06 11:26:27 -0800 |
| commit | c08c6e1f54c85fc299cf9f88cf330d6dd28a9a1d (patch) | |
| tree | b03659b467641e445b9f4a96423fd20ff806b7fb /mm/nommu.c | |
| parent | f047f4f3792344901e1ea18a180515d7d5349e02 (diff) | |
| download | lwn-c08c6e1f54c85fc299cf9f88cf330d6dd28a9a1d.tar.gz lwn-c08c6e1f54c85fc299cf9f88cf330d6dd28a9a1d.zip | |
nommu: get_user_pages(): pin last page on non-page-aligned start
The noMMU version of get_user_pages() fails to pin the last page when the
start address isn't page-aligned. The patch fixes this in a way that
makes find_extend_vma() congruent to its MMU cousin.
Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/nommu.c')
| -rw-r--r-- | mm/nommu.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/nommu.c b/mm/nommu.c index 55727a74af98..b9b5cceb1b68 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -146,7 +146,7 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, (VM_MAYREAD | VM_MAYWRITE) : (VM_READ | VM_WRITE); for (i = 0; i < nr_pages; i++) { - vma = find_vma(mm, start); + vma = find_extend_vma(mm, start); if (!vma) goto finish_or_fault; @@ -764,7 +764,7 @@ EXPORT_SYMBOL(find_vma); */ struct vm_area_struct *find_extend_vma(struct mm_struct *mm, unsigned long addr) { - return find_vma(mm, addr); + return find_vma(mm, addr & PAGE_MASK); } /* |