linux-kernel - Re: [PATCH repost 12/16] parisc/uaccess: fix sparse errors

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Date:	Thu, 25 Dec 2014 23:37:45 +0100
From:	Helge Deller <deller@....de>
To:	"Michael S. Tsirkin" <mst@...hat.com>, linux-kernel@...r.kernel.org
CC:	Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	linux-parisc@...r.kernel.org
Subject: Re: [PATCH repost 12/16] parisc/uaccess: fix sparse errors

Hi Michael,

On 12/25/2014 10:29 AM, Michael S. Tsirkin wrote:
> virtio wants to read bitwise types from userspace using get_user.  At the

I don't know the virtio code much yet, but does it makes sense to read bitwise types?
Will virtio then get possible troubles because of endianess correct as well?

Do you have a code example, or the sparse error message ?

Helge

> moment this triggers sparse errors, since the value is passed through an
> integer.
>
> Fix that up using __force.
>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>   arch/parisc/include/asm/uaccess.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/parisc/include/asm/uaccess.h b/arch/parisc/include/asm/uaccess.h
> index a5cb070..3a20da6 100644
> --- a/arch/parisc/include/asm/uaccess.h
> +++ b/arch/parisc/include/asm/uaccess.h
> @@ -104,7 +104,7 @@ struct exception_data {
>   	    }                                           \
>   	}                                               \
>   							\
> -	(x) = (__typeof__(*(ptr))) __gu_val;            \
> +	(x) = (__force __typeof__(*(ptr))) __gu_val;            \
>   	__gu_err;                                       \
>   })
>
>

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