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| author | David Howells <dhowells@redhat.com> | 2010-03-25 16:48:38 +0000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-25 14:13:26 -0700 |
| commit | 7561e8ca0dfaf6fca3feef982830de3b65300e5b (patch) | |
| tree | 8b3fa49efdec009515b9de7503160877953c4027 | |
| parent | 39f1cd635cbe8a42c3c74fa6bf9f61c1156bd27b (diff) | |
| download | linux-7561e8ca0dfaf6fca3feef982830de3b65300e5b.tar.bz2 | |
NOMMU: Revert 'nommu: get_user_pages(): pin last page on non-page-aligned start'
Revert the following patch:
commit c08c6e1f54c85fc299cf9f88cf330d6dd28a9a1d
Author: Steven J. Magnani <steve@digidescorp.com>
Date: Fri Mar 5 13:42:24 2010 -0800
nommu: get_user_pages(): pin last page on non-page-aligned start
As it assumes that the mappings begin at the start of pages - something that
isn't necessarily true on NOMMU systems. On NOMMU systems, it is possible for
a mapping to only occupy part of the page, and not necessarily touch either end
of it; in fact it's also possible for multiple non-overlapping mappings to
coexist on one page (consider direct mappings of ROMFS files, for example).
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Steven J. Magnani <steve@digidescorp.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -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 e4b8f4d28a3f..089982f5a4cf 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_extend_vma(mm, start); + vma = find_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 & PAGE_MASK); + return find_vma(mm, addr); } /* |