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| author | Bob Liu <lliubbo@gmail.com> | 2011-05-25 02:12:56 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-25 17:39:38 +0200 |
| commit | f67d9b1576c1c6e02100f8b27f4e9d66bbeb4d49 (patch) | |
| tree | c70649a911f85418c10075901c489caa7d8a0762 /mm/readahead.c | |
| parent | mm: batch activate_page() to reduce lock contention (diff) | |
| download | linux-f67d9b1576c1c6e02100f8b27f4e9d66bbeb4d49.tar.xz linux-f67d9b1576c1c6e02100f8b27f4e9d66bbeb4d49.zip | |
nommu: add page alignment to mmap
Currently on nommu arch mmap(),mremap() and munmap() doesn't do
page_align() which isn't consist with mmu arch and cause some issues.
First, some drivers' mmap() function depends on vma->vm_end - vma->start
is page aligned which is true on mmu arch but not on nommu. eg: uvc
camera driver.
Second munmap() may return -EINVAL[split file] error in cases when end is
not page aligned(passed into from userspace) but vma->vm_end is aligned
dure to split or driver's mmap() ops.
Add page alignment to fix those issues.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Bob Liu <lliubbo@gmail.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Greg Ungerer <gerg@snapgear.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/readahead.c')
0 files changed, 0 insertions, 0 deletions