linux-kernel - Re: [PATCH v2 03/40] arm64/uaccess: fix sparse errors

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Message-ID: <20150106191432.GC32449@arm.com>
Date:	Tue, 6 Jan 2015 19:14:32 +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 v2 03/40] arm64/uaccess: fix sparse errors

Hi Michael,

On Tue, Jan 06, 2015 at 03:43:40PM +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>
> 
> Acked-by: Will Deacon <will.deacon@....com>
> ---

Did you want us to take this via the arm64 tree, or are you planning to
merge it via another route?

Will

>  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..9a2069b 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)						\
> -- 
> MST
> 
> 
--
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