linux-kernel - Re: [PATCH] make CALLER

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Message-ID: <20090227112234.GA27221@pengutronix.de>
Date:	Fri, 27 Feb 2009 12:22:34 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] make CALLER_ADDRx overwriteable

Hi,

On Fri, Feb 27, 2009 at 04:32:45PM +0900, KOSAKI Motohiro wrote:
> > -#ifdef CONFIG_FRAME_POINTER
> > -/* TODO: need to fix this for ARM */
> > -# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
> > -# define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
> > -# define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
> > -# define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
> > -# define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
> > -# define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
> > -# define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
> > -#else
> > -# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
> > -# define CALLER_ADDR1 0UL
> > -# define CALLER_ADDR2 0UL
> > -# define CALLER_ADDR3 0UL
> > -# define CALLER_ADDR4 0UL
> > -# define CALLER_ADDR5 0UL
> > -# define CALLER_ADDR6 0UL
> > -#endif
> > +#ifndef CALLER_ADDR0
> 
> but I think this "#ifndef CALLER_ADDR0" don't explain developer intention at all.
> ARCH_HAS_XXXXX macro is better?
OK, this seems clearer.  I'd use HAVE_ARCH_CALLER_ADDR though.

Best regards
Uwe

-- 
Pengutronix e.K.                              | Uwe Kleine-König            |
Industrial Linux Solutions                    | http://www.pengutronix.de/  |
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