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Subject: Re: [PATCH] tracing: Cleanup the convoluted softirq tracepoints
From: Steven Rostedt <rostedt@goodmis.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Jason Baron <jbaron@redhat.com>, Thomas Gleixner <tglx@linutronix.de>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Koki Sanagi <sanagi.koki@jp.fujitsu.com>,
        Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@elte.hu>,
        Frederic Weisbecker <fweisbec@gmail.com>, nhorman@tuxdriver.com,
        scott.a.mcmillan@intel.com, laijs@cn.fujitsu.com,
        LKML <linux-kernel@vger.kernel.org>, eric.dumazet@gmail.com,
        kaneshige.kenji@jp.fujitsu.com, David Miller <davem@davemloft.net>,
        izumi.taku@jp.fujitsu.com, kosaki.motohiro@jp.fujitsu.com,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        "Luck, Tony" <tony.luck@intel.com>
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Date: Tue, 19 Oct 2010 18:56:53 -0400
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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