linux-kernel - Re: [PATCH] UIO: only call pgprot

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Date:	Wed, 5 Nov 2008 12:36:11 +0100
From:	"Hans J. Koch" <hjk@...utronix.de>
To:	Mike Frysinger <vapier@...too.org>
Cc:	hjk@...utronix.de, gregkh@...e.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] UIO: only call pgprot_noncached if defined

There seem to be archs that cannot easily implement a sensible
pgprot_noncached() function, so we should merge this patch. UIO doesn't
compile on these archs right now.

Thanks,
Hans

On Wed, Oct 29, 2008 at 01:26:17PM -0400, Mike Frysinger wrote:
> Not all arches support pgprot_noncached (like the Blackfin port).  Other
> drivers seem to handle this by checking to see if it is defined, so let's
> do that in the UIO driver as well.
> 
> Signed-off-by: Mike Frysinger <vapier@...too.org>

Signed-off-by: Hans J. Koch <hjk@...utronix.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 f9b4647..c43dbea 100644
> --- a/drivers/uio/uio.c
> +++ b/drivers/uio/uio.c
> @@ -529,7 +529,9 @@ static int uio_mmap_physical(struct vm_area_struct *vma)
>  
>  	vma->vm_flags |= VM_IO | VM_RESERVED;
>  
> +#ifdef pgprot_noncached
>  	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
> +#endif
>  
>  	return remap_pfn_range(vma,
>  			       vma->vm_start,
> -- 
> 1.6.0.2
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