The patch titled
mm/nommu.c: fix remap_pfn_range()
has been removed from the -mm tree. Its filename was
mm-nommuc-fix-remap_pfn_range.patch
This patch was dropped because it was merged into mainline or a subsystem tree
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@xxxxxxxxx>
remap_pfn_range() means map physical address pfn<<PAGE_SHIFT to user addr.
For nommu arch it's implemented by vma->vm_start = pfn << PAGE_SHIFT which
is wrong acroding the original meaning of this function. And some driver
developer using remap_pfn_range() with correct parameter will get
unexpected result because vm_start is changed. It should be implementd
like addr = pfn << PAGE_SHIFT but which is meanless on nommu arch, this
patch just make it simply return.
Parameter name and setting of vma->vm_flags also be fixed.
Signed-off-by: Bob Liu <lliubbo@xxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Acked-by: Greg Ungerer <gerg@xxxxxxxxxxx>
Cc: Mike Frysinger <vapier@xxxxxxxxxx>
Cc: Bob Liu <lliubbo@xxxxxxxxx>
Cc: <stable@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/nommu.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
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
@@ -1813,10 +1813,13 @@ struct page *follow_page(struct vm_area_
return NULL;
}
-int remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
- unsigned long to, unsigned long size, pgprot_t prot)
+int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
+ unsigned long pfn, unsigned long size, pgprot_t prot)
{
- vma->vm_start = vma->vm_pgoff << PAGE_SHIFT;
+ if (addr != (pfn << PAGE_SHIFT))
+ return -EINVAL;
+
+ vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP;
return 0;
}
EXPORT_SYMBOL(remap_pfn_range);
_
Patches currently in -mm which might be from lliubbo@xxxxxxxxx are
origin.patch
linux-next.patch
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