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From: Ingo Molnar <mingo@elte.hu>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Jason Baron <jbaron@redhat.com>,
	linux-kernel@vger.kernel.org, mathieu.desnoyers@polymtl.ca,
	tglx@linutronix.de, rostedt@goodmis.org, andi@firstfloor.org,
	roland@redhat.com, rth@redhat.com, mhiramat@redhat.com,
	fweisbec@gmail.com, avi@redhat.com, davem@davemloft.net,
	vgoyal@redhat.com, sam@ravnborg.org,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 03/13] jump label v9: x86 support
Date: Fri, 11 Jun 2010 09:58:11 +0200	[thread overview]
Message-ID: <20100611075811.GA16293@elte.hu> (raw)
In-Reply-To: <4C11D51E.3080909@zytor.com>


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

> On 06/10/2010 05:14 AM, Ingo Molnar wrote:
> > 
> > * Peter Zijlstra <peterz@infradead.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

  reply	other threads:[~2010-06-11  7:58 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-06-09 21:38 [PATCH 00/13] jump label v9 Jason Baron
2010-06-09 21:38 ` [PATCH 01/13] jump label v9: notifier atomic call chain notrace Jason Baron
2010-06-09 21:58   ` Frederic Weisbecker
2010-06-10 15:34     ` Jason Baron
2010-06-09 21:38 ` [PATCH 02/13] jump label v9: base patch Jason Baron
2010-06-09 22:35   ` Frederic Weisbecker
2010-06-10 15:44     ` Jason Baron
2010-06-10 16:22       ` Ingo Molnar
2010-06-10 17:11       ` Frederic Weisbecker
2010-06-09 22:36   ` Frederic Weisbecker
2010-06-10 12:06   ` Peter Zijlstra
2010-06-10 12:18   ` Peter Zijlstra
2010-06-09 21:39 ` [PATCH 03/13] jump label v9: x86 support Jason Baron
2010-06-10 12:12   ` Peter Zijlstra
2010-06-10 12:14     ` Ingo Molnar
2010-06-10 13:26       ` Andi Kleen
2010-06-10 14:12         ` Peter Zijlstra
2010-06-10 14:28           ` Andi Kleen
2010-06-10 15:37         ` Ingo Molnar
2010-06-10 16:24           ` Andi Kleen
2010-06-11  8:12             ` Ingo Molnar
2010-06-11  8:30               ` Andi Kleen
2010-06-10 16:29         ` Steven Rostedt
2010-06-10 15:04       ` Jason Baron
2010-06-10 16:13         ` Mathieu Desnoyers
2010-06-11  0:52           ` Jason Baron
2010-06-11  6:18       ` H. Peter Anvin
2010-06-11  7:58         ` Ingo Molnar [this message]
2010-06-10 12:15   ` Peter Zijlstra
2010-06-10 12:33   ` Peter Zijlstra
2010-06-09 21:39 ` [PATCH 04/13] jump label v9: tracepoint support Jason Baron
2010-06-10 12:22   ` Peter Zijlstra
2010-06-09 21:39 ` [PATCH 05/13] jump label v9: add module support Jason Baron
2010-06-09 21:39 ` [PATCH 06/13] jump label v9: move ftrace_dyn_arch_init to common code Jason Baron
2010-06-19  3:24   ` Steven Rostedt
2010-06-09 21:39 ` [PATCH 07/13] jump label v9: sort jump table at build-time Jason Baron
2010-06-09 21:39 ` [PATCH 08/13] jump label v9: initialize workqueue tracepoints *before* they are registered Jason Baron
2010-06-09 21:39 ` [PATCH 09/13] jump label v9: jump_label_text_reserved() to reserve our jump points Jason Baron
2010-06-09 21:39 ` [PATCH 10/13] jump label v9: convert jump label to use a key Jason Baron
2010-06-10 12:38   ` Peter Zijlstra
2010-06-10 12:43   ` Peter Zijlstra
2010-06-10 13:57     ` Jason Baron
2010-06-10 14:46       ` Peter Zijlstra
2010-06-09 21:39 ` [PATCH 11/13] jump label v9: convert dynamic debug to use jump labels Jason Baron
2010-06-09 21:39 ` [PATCH 12/13] jump label v9: sparc64 add jump_label support Jason Baron
2010-06-09 21:39 ` [PATCH 13/13] jump label v9: add docs Jason Baron
2010-06-10 12:49   ` Peter Zijlstra
2010-06-15  3:47 ` [PATCH 00/13] jump label v9 David Miller
2010-06-15 14:28   ` Jason Baron
2010-06-15 15:44     ` Mathieu Desnoyers
2010-06-18  3:45       ` Tony Breeds
2010-06-18 15:18         ` Mathieu Desnoyers
2010-06-15 17:13     ` David Miller
2010-06-15 17:28       ` H. Peter Anvin

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