From: Dan Carpenter <dan.carpenter@oracle.com>
To: Ian Abbott <abbotti@mev.co.uk>
Cc: "devel@driverdev.osuosl.org" <devel@driverdev.osuosl.org>,
"fmhess@users.sourceforge.net" <fmhess@users.sourceforge.net>,
Ian Abbott <ian.abbott@mev.co.uk>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
Linux Kernel <linux-kernel@vger.kernel.org>,
H Hartley Sweeten <hartleys@visionengravers.com>
Subject: Re: [PATCH] staging: comedi: remove __user annotation inside of struct's
Date: Wed, 9 May 2012 17:19:20 +0300 [thread overview]
Message-ID: <20120509141920.GT22134@mwanda> (raw)
In-Reply-To: <4FAA4E85.6020305@mev.co.uk>
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
next prev parent reply other threads:[~2012-05-09 14:16 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-08 23:41 [PATCH] staging: comedi: remove __user annotation inside of struct's H Hartley Sweeten
2012-05-08 23:55 ` H Hartley Sweeten
2012-05-09 10:20 ` Ian Abbott
2012-05-09 10:31 ` Dan Carpenter
2012-05-09 11:01 ` Ian Abbott
2012-05-09 14:19 ` Dan Carpenter [this message]
2012-05-10 11:05 ` Ian Abbott
2012-05-09 14:24 ` gregkh
2012-05-09 15:52 ` H Hartley Sweeten
2012-05-09 15:56 ` gregkh
2012-05-09 16:03 ` H Hartley Sweeten
2012-05-09 16:41 ` H Hartley Sweeten
2012-05-09 20:42 ` gregkh
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