linux-kernel - Re: [PATCH 03/13] jump label v9: x86 support

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Message-ID: <4C11D51E.3080909@zytor.com>
Date:	Thu, 10 Jun 2010 23:18:06 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Jason Baron <jbaron@...hat.com>, linux-kernel@...r.kernel.org,
	mathieu.desnoyers@...ymtl.ca, tglx@...utronix.de,
	rostedt@...dmis.org, andi@...stfloor.org, roland@...hat.com,
	rth@...hat.com, mhiramat@...hat.com, fweisbec@...il.com,
	avi@...hat.com, davem@...emloft.net, vgoyal@...hat.com,
	sam@...nborg.org
Subject: Re: [PATCH 03/13] jump label v9: x86 support

On 06/10/2010 05:14 AM, Ingo Molnar wrote:
> 
> * Peter Zijlstra <peterz@...radead.org> wrote:
> 
>> On Wed, 2010-06-09 at 17:39 -0400, Jason Baron wrote:
>>> +       select HAVE_ARCH_JUMP_LABEL if !CC_OPTIMIZE_FOR_SIZE
>>
>> That deserves a comment somewhere, it basically makes OPTIMIZE_FOR_SIZE 
>> useless...
> 
> Hm, we need more than a comment for that - distros enable CC_OPTIMIZE_FOR_SIZE 
> all the time, for the massive kernel image (and hotpath cache footprint) 
> savings. Is this fixable?
> 

Actually the current reports from the gcc community is that gcc 4.5.0 +
-Os produces a broken kernel even without asm goto:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44129

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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