linux-kernel - Re: [PATCH 01/18] x86/uaccess: fix sparse errors

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Message-ID: <20141216164717.GA21876@redhat.com>
Date:	Tue, 16 Dec 2014 18:47:17 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Qiaowei Ren <qiaowei.ren@...el.com>
Subject: Re: [PATCH 01/18] x86/uaccess: fix sparse errors

On Sun, Dec 14, 2014 at 06:51:57PM +0200, 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>
> ---

Ping.
Do x86 maintainers consider fixing sparse errors
applicable for 3.19?
If yes, can you pls merge this patch?


>  arch/x86/include/asm/uaccess.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h
> index 0d592e0..8ce1af8 100644
> --- a/arch/x86/include/asm/uaccess.h
> +++ b/arch/x86/include/asm/uaccess.h
> @@ -179,7 +179,7 @@ __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
>  	asm volatile("call __get_user_%P3"				\
>  		     : "=a" (__ret_gu), "=r" (__val_gu)			\
>  		     : "0" (ptr), "i" (sizeof(*(ptr))));		\
> -	(x) = (__typeof__(*(ptr))) __val_gu;				\
> +	(x) = (__force __typeof__(*(ptr))) __val_gu;				\
>  	__ret_gu;							\
>  })
>  
> -- 
> MST
> 
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