Re: [PATCH 03/18] arm64/uaccess: fix sparse errors

[Will Deacon]

On Sun, Dec 14, 2014 at 04:52:09PM +0000, Michael S. Tsirkin wrote:
> virtio wants to read bitwise types from userspace using get_user.  At the
> 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@xxxxxxxxxx>
> ---
>  arch/arm64/include/asm/uaccess.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h
> index 3bf8f4e..8d66bcf 100644
> --- a/arch/arm64/include/asm/uaccess.h
> +++ b/arch/arm64/include/asm/uaccess.h
> @@ -147,7 +147,7 @@ do {									\
>  	default:							\
>  		BUILD_BUG();						\
>  	}								\
> -	(x) = (__typeof__(*(ptr)))__gu_val;				\
> +	(x) = (__force __typeof__(*(ptr)))__gu_val;				\
>  } while (0)
>  
>  #define __get_user(x, ptr)						\

Acked-by: Will Deacon <will.deacon@xxxxxxx>

Will
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/