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nommu: get_user_pages(): pin last page on non-page-aligned start

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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>
This commit is contained in:
Steven J. Magnani 2010-03-05 13:42:24 -08:00 committed by Linus Torvalds
parent f047f4f379
commit c08c6e1f54
1 changed files with 2 additions and 2 deletions
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4
mm/nommu.c
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@ -146,7 +146,7 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
(VM_MAYREAD | VM_MAYWRITE) : (VM_READ | VM_WRITE); (VM_MAYREAD | VM_MAYWRITE) : (VM_READ | VM_WRITE);
for (i = 0; i < nr_pages; i++) { for (i = 0; i < nr_pages; i++) {
vma = find_vma(mm, start); vma = find_extend_vma(mm, start);
if (!vma) if (!vma)
goto finish_or_fault; 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) 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);
} }
/* /*