Gitweb: http://git.kernel.org/linus/7561e8ca0dfaf6fca3feef982830de3b65300e5b
Commit: 7561e8ca0dfaf6fca3feef982830de3b65300e5b
Parent: 39f1cd635cbe8a42c3c74fa6bf9f61c1156bd27b
Author: David Howells <dhowells@redhat.com>
AuthorDate: Thu Mar 25 16:48:38 2010 +0000
Committer: Linus Torvalds <torvalds@linux-foundation.org>
CommitDate: Thu Mar 25 14:13:26 2010 -0700
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>
---
mm/nommu.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/mm/nommu.c b/mm/nommu.c
index e4b8f4d..089982f 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);
}
/*
--
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