linux-kernel - Re: [PATCH] powerpc: Add jump label support

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Message-ID: <1289273580.21111.193.camel@concordia>
Date:	Tue, 09 Nov 2010 14:33:00 +1100
From:	Michael Ellerman <michael@...erman.id.au>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linuxppc-dev@...abs.org, Kumar Gala <kumar.gala@...escale.com>,
	"David S.Miller" <davem@...emloft.net>, jbaron@...hat.com,
	linux-kernel@...r.kernel.org, Anton Blanchard <anton@...ba.org>
Subject: Re: [PATCH] powerpc: Add jump label support

On Mon, 2010-11-08 at 09:18 -0500, Steven Rostedt wrote:
> On Mon, 2010-11-08 at 15:12 +1100, Michael Ellerman wrote:
> > This patch adds support for the new "jump label" feature.
> 
> Darn it! I wanted to port this!!!
> 
> ;-)

Sorry! I've been locked in a dark room for ages and this was a nice
chance to work on some upstream code for a change :)

> > Built for 64 & 32 bit, tested on 64 bit. Survives a kernel build under
> > perf with all tracepoints enabled, and manual inspection of the patched
> > code looks right. But still, lightly tested, YMMV.
> > 
> > Unlike x86 and sparc we just merrily patch the code with no locks etc,
> > as far as I know this is safe, but I'm not really sure what the x86/sparc
> > code is protecting against so maybe it's not.
> 
> Thanks, I'll give it a test on my electra as soon as I get a gcc 4.5.1
> cross compiler working.

Thanks.

cheers



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