linux-kernel - Re: [PATCH v2] ftrace: On PowerPC we don't need frame pointers for CALLER

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Date:	Tue, 3 Feb 2009 17:06:45 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Anton Vorontsov <avorontsov@...mvista.com>
Cc:	Steven Rostedt <srostedt@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ftrace: On PowerPC we don't need frame pointers for
	CALLER_ADDRs


* Anton Vorontsov <avorontsov@...mvista.com> wrote:

> According to this discussion:
> 
> http://lkml.org/lkml/2008/7/25/338
> http://lkml.org/lkml/2008/7/26/72
> 
> Frame pointers do nothing useful on PowerPC, so lib/Kconfig.debug
> makes CONFIG_FRAME_POINTER unselectable on PPC targets. But ftrace.h
> requires CONFIG_FRAME_POINTER for CALLER_ADDR macros. [...]

hm, why not add PPC to FRAME_POINTERS list of architectures, and select it 
from the powerpc arch Kconfig? Does that cause complications somewhere?

	Ingo
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