linux-kernel - Re: [PATCH v2 06/40] cris/uaccess: fix sparse errors

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Message-ID: <20150127162705.GB26817@axis.com>
Date:	Tue, 27 Jan 2015 17:27:05 +0100
From:	Jesper Nilsson <jesper.nilsson@...s.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Mikael Starvik <starvik@...s.com>,
	Jesper Nilsson <jespern@...s.com>,
	linux-cris-kernel <linux-cris-kernel@...s.com>
Subject: Re: [PATCH v2 06/40] cris/uaccess: fix sparse errors

On Tue, Jan 06, 2015 at 04:43:50PM +0100, 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.

Looks sane, I'll take this in the CRIS tree since you
have a cleanup patch which depends on it.

Thanks!

/Jesper

> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  arch/cris/include/asm/uaccess.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/cris/include/asm/uaccess.h b/arch/cris/include/asm/uaccess.h
> index 9145408..9cf5a23 100644
> --- a/arch/cris/include/asm/uaccess.h
> +++ b/arch/cris/include/asm/uaccess.h
> @@ -153,7 +153,7 @@ struct __large_struct { unsigned long buf[100]; };
>  ({								\
>  	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;		\
>  	__gu_err;						\
>  })
>  
> @@ -163,7 +163,7 @@ struct __large_struct { unsigned long buf[100]; };
>  	const __typeof__(*(ptr)) *__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;			\
>  	__gu_err;							\
>  })
>  
> -- 
> MST

/^JN - Jesper Nilsson
-- 
               Jesper Nilsson -- jesper.nilsson@...s.com
--
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