linux-kernel - Re: [PATCH] ARM: ftrace: Ensure code modifications are synchronised across all cpus

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Date:	Fri, 07 Dec 2012 13:17:25 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Jon Medhurst (Tixy)" <tixy@...aro.org>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org,
	Ingo Molnar <mingo@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Rabin Vincent <rabin@....in>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: ftrace: Ensure code modifications are synchronised
 across all cpus

On Fri, 2012-12-07 at 13:06 -0500, Steven Rostedt wrote:

> If you can get away with that, sure. Or better yet. If the arch supports
> it, you can do what I did with powerpc. That was just replace the nop
> with the 32bit branch, and the 32bit branch with a 32bit nop. No nops.

s/No nops/No breakpoints/

> No multiple steps in between. I just did the swap of all function
> tracepoints in one fell swoop, and then did the icache sync.
> 

-- Steve


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