linux-kernel - Re: [PATCH/RFC 2/3] ftrace: introduce nohotpatch function attribute

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Message-ID: <20150128065754.4466f07b@gandalf.local.home>
Date:	Wed, 28 Jan 2015 06:57:54 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Dominik Vogt <vogt@...ux.vnet.ibm.com>,
	Masami Hiramatsu <maasami.hiramatsu.pt@...achi.com>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Jiri Kosina <jkosina@...e.cz>, Jiri Slaby <jslaby@...e.cz>,
	Andreas Krebbel <krebbel@...ux.vnet.ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH/RFC 2/3] ftrace: introduce nohotpatch function attribute

On Wed, 28 Jan 2015 06:36:45 +0100
Heiko Carstens <heiko.carstens@...ibm.com> wrote:

> On Tue, Jan 27, 2015 at 09:42:28AM -0500, Steven Rostedt wrote:
> > On Tue, 27 Jan 2015 07:19:42 +0100
> > Dominik Vogt <vogt@...ux.vnet.ibm.com> wrote:
> >  
> > > While the kernel may use only profiling or hotpatch at the same
> > > time, Gcc is able to generate both for the same function.
> > 
> > Understood, but would that be useful for the kernel?
> 
> Right now not. We may change that anyway in the future if needed.
> 
> Steven, how do we proceed with this small series?
> 
> Since there don't seem to be any objections, I'll repost with the
> changed notrace define. However I think the whole stuff should go
> upstream via the ftrace tree. Is that ok with you?

I can take it or you can, I'm fine either way. If you want to take it,
just add my Acked-by. If you prefer me to take it, just let me know.

-- Steve

> 
> FWIW, the s390 gcc hotpatch feature was merged in the meantime:
> https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=11762b8363737591bfb9c66093bc2edf289b917f

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