linux-kernel - Re: [PATCH 1/3] jump label: add enabled/disabled state to jump label key entries

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Message-ID: <1290613997.30543.529.camel@gandalf.stny.rr.com>
Date:	Wed, 24 Nov 2010 10:53:17 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jason Baron <jbaron@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, mingo@...e.hu,
	mathieu.desnoyers@...ymtl.ca, hpa@...or.com, tglx@...utronix.de,
	andi@...stfloor.org, roland@...hat.com, rth@...hat.com,
	masami.hiramatsu.pt@...achi.com, fweisbec@...il.com,
	avi@...hat.com, davem@...emloft.net, sam@...nborg.org,
	ddaney@...iumnetworks.com, michael@...erman.id.au,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] jump label: add enabled/disabled state to jump
 label key entries

On Wed, 2010-11-24 at 10:42 -0500, Jason Baron wrote:

> > And I think the only arch where you can do text pokes without cross-cpu
> > synchronization is one that doesn't have SMP support.
> > 
> > 
> 
> is this really true?
> 
> The powerpc implementation uses patch_instruction():
> 
> 
> arch/powerpc/lib/code-patching.c:
> 
> void patch_instruction(unsigned int *addr, unsigned int instr)
> {
>         *addr = instr;
>         asm ("dcbst 0, %0; sync; icbi 0,%0; sync; isync" : : "r"
> (addr));
> }

Is this ever called outside of boot up? After SMP is enabled? (besides
for creating trampolines, before they are used).

-- Steve


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