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

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Message-ID: <20141215111716.GG20738@arm.com>
Date:	Mon, 15 Dec 2014 11:17:16 +0000
From:	Will Deacon <will.deacon@....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>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Christopher Covington <cov@...eaurora.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 03/18] arm64/uaccess: fix sparse errors

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@...hat.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@....com>

Will
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