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

Will Deacon
2014-12-15T11:17:29Z

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@redhat.com>
> ---
> 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@arm.com>

Will