linux-kernel - Re: [PATCH v2 09/40] metag/uaccess: fix sparse errors

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Message-ID: <54AD00AC.2030801@imgtec.com>
Date:	Wed, 7 Jan 2015 09:47:24 +0000
From:	James Hogan <james.hogan@...tec.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>,
	<linux-kernel@...r.kernel.org>
CC:	Arnd Bergmann <arnd@...db.de>, <linux-arch@...r.kernel.org>,
	<linux-metag@...r.kernel.org>
Subject: Re: [PATCH v2 09/40] metag/uaccess: fix sparse errors

Hi Machael,

On 06/01/15 15:43, 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@...hat.com>
> ---
>  arch/metag/include/asm/uaccess.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/metag/include/asm/uaccess.h b/arch/metag/include/asm/uaccess.h
> index 0748b0a..c314b45 100644
> --- a/arch/metag/include/asm/uaccess.h
> +++ b/arch/metag/include/asm/uaccess.h
> @@ -135,7 +135,7 @@ extern long __get_user_bad(void);
>  ({                                                              \
>  	long __gu_err, __gu_val;                                \
>  	__get_user_size(__gu_val, (ptr), (size), __gu_err);	\
> -	(x) = (__typeof__(*(ptr)))__gu_val;                     \
> +	(x) = (__force __typeof__(*(ptr)))__gu_val;                     \

As I mentioned before, can you please adjust the position of the \ to
line up.

>  	__gu_err;                                               \
>  })
>  
> @@ -145,7 +145,7 @@ extern long __get_user_bad(void);
>  	const __typeof__(*(ptr)) __user *__gu_addr = (ptr);		\
>  	if (access_ok(VERIFY_READ, __gu_addr, size))			\
>  		__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\
> -	(x) = (__typeof__(*(ptr)))__gu_val;                             \
> +	(x) = (__force __typeof__(*(ptr)))__gu_val;                             \

same here (this one causes checkpatch error due to 80 column limit).

>  	__gu_err;                                                       \
>  })
>  
> 

With those changes,
Acked-by: James Hogan <james.hogan@...tec.com>

Cheers
James


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