linux-kernel - Re: [PATCH] staging: comedi: remove __user annotation inside of struct's

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Date:	Wed, 9 May 2012 17:19:20 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Ian Abbott <abbotti@....co.uk>
Cc:	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"fmhess@...rs.sourceforge.net" <fmhess@...rs.sourceforge.net>,
	Ian Abbott <ian.abbott@....co.uk>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	H Hartley Sweeten <hartleys@...ionengravers.com>
Subject: Re: [PATCH] staging: comedi: remove __user annotation inside of
 struct's

On Wed, May 09, 2012 at 12:01:25PM +0100, Ian Abbott wrote:
> Are there any handy macros for casting pointers to __user pointers,
> something like
> 
> #define _user(p) ((typeof(*(p)) __user *)(p))
> 
> but preferably without the repeated expansion of 'p' in case of
> side-effects?

typeof() doesn't have side effects.

#include <stdio.h>

int main(void)
{
	int x = 0;
	typeof(x++) y;

	printf("%d\n", x);

	return 0;
}

regards,
dan carpenter
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