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

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Date:	Tue, 6 Jan 2015 23:48:20 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Will Deacon <will.deacon@....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

On Tue, Jan 06, 2015 at 07:14:32PM +0000, Will Deacon wrote:
> 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

Up to you really: if you don't pick it up, Arnd said he'll merge
through his tree.

> >  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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