linux-kernel - Re: [PATCH v3] asm-generic: {get,put}_user ptr argument evaluate only 1 time

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Message-ID: <87lhe867wi.wl-ysato@users.sourceforge.jp>
Date:	Wed, 22 Jul 2015 15:09:01 +0900
From:	Yoshinori Sato <ysato@...rs.sourceforge.jp>
To:	David Howells <dhowells@...hat.com>
Cc:	Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] asm-generic: {get,put}_user ptr argument evaluate only 1 time

On Tue, 21 Jul 2015 23:06:13 +0900,
David Howells wrote:
> 
> Yoshinori Sato <ysato@...rs.sourceforge.jp> wrote:
> 
> >  #define get_user(x, ptr)					\
> >  ({								\
> > +	uintptr_t __uip = (uintptr_t)(ptr);			\
> 
> const?

OK.

> >  	might_fault();						\
> > -	access_ok(VERIFY_READ, ptr, sizeof(*ptr)) ?		\
> > -		__get_user(x, ptr) :				\
> > +	access_ok(VERIFY_READ, __uip, sizeof(*ptr)) ?		\
> > +		__get_user((x), (__typeof__(*ptr) *)__uip) :	\
> >  		-EFAULT;					\
> >  })
> 
> Would it be better to use void* instead of uintptr_t?

No reason.
I'll changed void*

Thanks.

> David

-- 
Yoshinori Sato
<ysato@...rs.sourceforge.jp>
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