linux-kernel - Re: [PATCH] tracing: Cleanup the convoluted softirq tracepoints

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Message-ID: <1287529013.16971.537.camel@gandalf.stny.rr.com>
Date:	Tue, 19 Oct 2010 18:56:53 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Jason Baron <jbaron@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Koki Sanagi <sanagi.koki@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	nhorman@...driver.com, scott.a.mcmillan@...el.com,
	laijs@...fujitsu.com, LKML <linux-kernel@...r.kernel.org>,
	eric.dumazet@...il.com, kaneshige.kenji@...fujitsu.com,
	David Miller <davem@...emloft.net>, izumi.taku@...fujitsu.com,
	kosaki.motohiro@...fujitsu.com,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"Luck, Tony" <tony.luck@...el.com>
Subject: Re: [PATCH] tracing: Cleanup the convoluted softirq tracepoints

On Tue, 2010-10-19 at 15:44 -0700, H. Peter Anvin wrote:
> On 10/19/2010 03:38 PM, Jason Baron wrote:
> > 
> > I'm not sure I did, the documentation says that we have nop followed by
> > a jmp:
> > 
> > +The new code is a 'nopl' followed by a 'jmp'. Thus:
> > +
> > +nopl - 0f 1f 44 00 00 - 5 bytes
> > +jmp  - eb 3e          - 2 bytes
> > 
> 
> There is no excuse for needing the second jump here, obviously...

Now the trick is to tell gcc that.

-- Steve


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