linux-kernel - Re: [PATCH 2/2] jump label: disable due to compiler bug

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Date:	Fri, 29 Oct 2010 08:18:07 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jason Baron <jbaron@...hat.com>,
	David Daney <ddaney@...iumnetworks.com>, rth@...hat.com,
	"H. Peter Anvin" <hpa@...or.com>, mathieu.desnoyers@...ymtl.ca,
	tglx@...utronix.de, andi@...stfloor.org, roland@...hat.com,
	masami.hiramatsu.pt@...achi.com, fweisbec@...il.com,
	avi@...hat.com, davem@...emloft.net, vgoyal@...hat.com,
	sam@...nborg.org, tony@...eyournoodle.com, dsd@...top.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] jump label: disable due to compiler bug

On Fri, 2010-10-29 at 08:34 +0200, Ingo Molnar wrote:
> * Jason Baron <jbaron@...hat.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 ?

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

-- Steve

> 
> Also, could you please send the fix to me ASAP? We dont need confirmation and 
> re-confirmation and testing, as this thing is crashing on me several times every 
> single day ...
> 
> I also know that 64-bit never crashed this way, nor did the 32-bit kernel with 
> function tracer enabled - so -maccumulate-outgoing-args will likely fix it.
> 
> Lets get the ball rolling so we can get it to Linus today ...



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