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From: Ingo Molnar <mingo@elte.hu>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Jason Baron <jbaron@redhat.com>,
	David Daney <ddaney@caviumnetworks.com>,
	rth@redhat.com, "H. Peter Anvin" <hpa@zytor.com>,
	mathieu.desnoyers@polymtl.ca, tglx@linutronix.de,
	andi@firstfloor.org, roland@redhat.com,
	masami.hiramatsu.pt@hitachi.com, fweisbec@gmail.com,
	avi@redhat.com, davem@davemloft.net, vgoyal@redhat.com,
	sam@ravnborg.org, tony@bakeyournoodle.com, dsd@laptop.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] jump label: disable due to compiler bug
Date: Fri, 29 Oct 2010 14:22:30 +0200	[thread overview]
Message-ID: <20101029122230.GA25663@elte.hu> (raw)
In-Reply-To: <1288354687.18238.433.camel@gandalf.stny.rr.com>


* Steven Rostedt <rostedt@goodmis.org> wrote:

> On Fri, 2010-10-29 at 08:34 +0200, Ingo Molnar wrote:
> > * Jason Baron <jbaron@redhat.com> wrote:
> > 
> > > Thus, I'm going to propose a patch, which makes jump label conditional on x86_64 
> > > for now [...]
> > 
> > No, we dont do 64-bit only features really.
> > 
> > > [...] (adding -maccumulate-outgoing-args to x86 increases the text size, so I'm 
> > > not proposing adding the flag there).
> > 
> > Please make jump labels configurable instead. (dependent on EMBEDDED)
> 
> Do you mean to have it dependent on !EMBEDDED, or perhaps !CC_OPTIMIZE_FOR_SIZE ?

CC_OPTIMIZE_FOR_SIZE dependency probably not. Might even leave out !EMBEDDED, to 
make it generally configurable.

Also, we should make it default off - we need to see whether there are any compiler 
bugs lurking.

> I can see people making a big stink about adding back a gcc option that makes the 
> kernel bigger.

Depends on exactly how much .text we are talking about here. Plus it would be 
default-off.

Thanks,

	Ingo

  reply	other threads:[~2010-10-29 12:23 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-10-27 21:07 [PATCH 0/2] jump label updates Jason Baron
2010-10-27 21:07 ` [PATCH 1/2] move arch_init_ideal_nop5 later Jason Baron
2010-10-27 22:24   ` H. Peter Anvin
2010-10-28  2:11     ` Steven Rostedt
2010-10-28  2:59       ` H. Peter Anvin
2010-10-27 21:07 ` [PATCH 2/2] jump label: disable due to compiler bug Jason Baron
2010-10-27 22:21   ` H. Peter Anvin
2010-10-28 14:17     ` Jason Baron, rth
2010-10-28 18:55       ` David Daney
2010-10-28 20:11         ` Jason Baron
2010-10-29  6:34           ` Ingo Molnar
2010-10-29 12:18             ` Steven Rostedt
2010-10-29 12:22               ` Ingo Molnar [this message]
2010-10-29 12:46                 ` Steven Rostedt
2010-10-29 13:10                   ` Ingo Molnar
2010-10-29 13:35                   ` Mathieu Desnoyers
2010-10-29 16:18                     ` Steven Rostedt
2010-10-29 17:18                       ` David Daney
2010-10-29 17:33                         ` Steven Rostedt
2010-10-29 17:48                           ` David Daney
2010-10-29 18:03                             ` Steven Rostedt
2010-10-29 18:13                             ` Richard Henderson
2010-10-29 18:25                               ` Steven Rostedt
2010-10-29 20:15                           ` H. Peter Anvin
2010-10-29 20:42                             ` Mathieu Desnoyers
2010-10-29 20:47                             ` Steven Rostedt
2010-10-29 20:51                               ` H. Peter Anvin
2010-10-29 20:58                                 ` Steven Rostedt
2010-10-30  7:47                               ` Andi Kleen
2010-10-30 14:00                                 ` Steven Rostedt
2010-10-29 20:05                       ` Mathieu Desnoyers
2010-10-29 20:44                         ` Steven Rostedt
2010-10-29 15:59           ` Richard Henderson
2010-10-27 21:15 ` [PATCH 0/2] jump label updates David Miller
2010-10-28  1:33   ` Steven Rostedt

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