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

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Date:	Fri, 11 Jun 2010 09:58:11 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
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, Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 03/13] jump label v9: x86 support


* H. Peter Anvin <hpa@...or.com> wrote:

> 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

Well, most distros havent switched to gcc 4.5 yet (even rawhide is still on 
4.4 + backports) and i guess the lack of testing shows. New GCC versions have 
a long history of causing bugs in the kernel.

Thanks,

	Ingo
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