+ mm-nommuc-fix-remap_pfn_range.patch added to -mm tree

+ mm-nommuc-fix-remap_pfn_range.patch added to -mm tree

[akpm]

The patch titled
     mm/nommu.c: fix remap_pfn_range()
has been added to the -mm tree.  Its filename is
     mm-nommuc-fix-remap_pfn_range.patch

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out what to do about this

The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/

------------------------------------------------------
Subject: mm/nommu.c: fix remap_pfn_range()
From: Bob Liu <lliubbo@gmail.com>

remap_pfn_range() does not update vma->end on no mmu arch which will cause
munmap() fail because it can't match the vma.

eg.  fb_mmap() in fbmem.c will call io_remap_pfn_range() which is
remap_pfn_range() on nommu arch, if an address is not page aligned
vma->start will be changed in remap_pfn_range(), but neither size nor
vma->end will be updated.  Then munmap(start, len) can't find the vma to
free, because it need to compare (start + len) with vma->end.

Signed-off-by: Bob Liu <lliubbo@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Greg Ungerer <gerg@uclinux.org>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Bob Liu <lliubbo@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/nommu.c |    1 +
 1 file changed, 1 insertion(+)

diff -puN mm/nommu.c~mm-nommuc-fix-remap_pfn_range mm/nommu.c
--- a/mm/nommu.c~mm-nommuc-fix-remap_pfn_range
+++ a/mm/nommu.c
@@ -1817,6 +1817,7 @@ int remap_pfn_range(struct vm_area_struc
 		unsigned long to, unsigned long size, pgprot_t prot)
 {
 	vma->vm_start = vma->vm_pgoff << PAGE_SHIFT;
+	vma->vm_end = vma->vm_start + size;
 	return 0;
 }
 EXPORT_SYMBOL(remap_pfn_range);
_

Patches currently in -mm which might be from lliubbo@gmail.com are

origin.patch
mm-nommuc-fix-remap_pfn_range.patch