linux-kernel - Re: [PATCH] SLQB: Use _RET_IP_ instead of __builtin_return

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Date:	Sun, 3 May 2009 08:19:39 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...shcourse.ca>
To:	Pekka J Enberg <penberg@...helsinki.fi>
cc:	npiggin@...e.de,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] SLQB: Use _RET_IP_ instead of
 __builtin_return_address(0)

On Sun, 3 May 2009, Pekka J Enberg wrote:

> From: Pekka Enberg <penberg@...helsinki.fi>
>
> This patch changes SLQB to use the shorter _RET_IP_ form for consistency
> with SLUB and to prepare SQLB for eventual kmemtrace hooks.

... big snip ...

>  void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags)
>  {
> -	return __kmem_cache_alloc(s, gfpflags, __builtin_return_address(0));
> +	return __kmem_cache_alloc(s, gfpflags, _RET_IP_);
>  }

  since i originally pointed out this possible simplification, i might
as well also point out that the above is not necessarily correct.  in
include/linux/kernel.h:

#define _RET_IP_   (unsigned long)__builtin_return_address(0)

as in, _RET_IP_ represents the **(unsigned long)** cast of that
(void*) value.  so, technically, that's not merely an aesthetic
replacement.  is that still what you wanted?

rday
--

========================================================================
Robert P. J. Day                               Waterloo, Ontario, CANADA

        Linux Consulting, Training and Annoying Kernel Pedantry.

Web page:                                          http://crashcourse.ca
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