Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 1/2] UIO: add pgprot_noncached() to UIO mmap code | Date | Mon, 24 Mar 2008 23:16:53 -0700 |
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From: Jean-Samuel Chenard <jsamch@gmail.com>
Mapping of physical memory in UIO needs pgprot_noncached() to ensure that IO memory is not cached. Without pgprot_noncached(), it (accidentally) works on x86 and arm, but fails on PPC.
Signed-off-by: Jean-Samuel Chenard <jsamch@gmail.com> Signed-off-by: Hans J Koch <hjk@linutronix.de> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- drivers/uio/uio.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index e8a01f2..1175908 100644 --- a/drivers/uio/uio.c +++ b/drivers/uio/uio.c @@ -470,6 +470,8 @@ static int uio_mmap_physical(struct vm_area_struct *vma) vma->vm_flags |= VM_IO | VM_RESERVED; + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + return remap_pfn_range(vma, vma->vm_start, idev->info->mem[mi].addr >> PAGE_SHIFT, -- 1.5.4.3
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