Messages in this thread Patch in this message | | | Date | Fri, 14 Mar 2008 11:28:36 +0100 | From | "Hans J. Koch" <> | Subject | [PATCH] Add pgprot_noncached() to UIO mmap code |
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From: Jean-Samuel Chenard <jsamch@gmail.com> To: Greg KH <greg@kroah.com> Cc: Hans J Koch <hjk@linutronix.de>, linux-kernel@vger.kernel.org, Juergen Beisert <juergen127@kreuzholzen.de> Date: Fri, 14 Mar 2008 11:19:49 +0100 Subject: Add pgprot_noncached() to UIO mmap code
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>
--- drivers/uio/uio.c | 2 ++ 1 file changed, 2 insertions(+)
Index: linux-2.6.25-rc/drivers/uio/uio.c =================================================================== --- linux-2.6.25-rc.orig/drivers/uio/uio.c 2008-03-14 11:00:59.000000000 +0100 +++ linux-2.6.25-rc/drivers/uio/uio.c 2008-03-14 11:03:13.000000000 +0100 @@ -470,6 +470,8 @@ 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,
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