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From: Dominik Vogt <vogt@linux.vnet.ibm.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>,
	Masami Hiramatsu <maasami.hiramatsu.pt@hitachi.com>,
	Vojtech Pavlik <vojtech@suse.cz>, Jiri Kosina <jkosina@suse.cz>,
	Jiri Slaby <jslaby@suse.cz>,
	Andreas Krebbel <krebbel@linux.vnet.ibm.com>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH/RFC 2/3] ftrace: introduce nohotpatch function attribute
Date: Tue, 27 Jan 2015 07:19:42 +0100	[thread overview]
Message-ID: <20150127061941.GA4591@linux.vnet.ibm.com> (raw)
In-Reply-To: <20150126093701.699763dc@gandalf.local.home>

On Mon, Jan 26, 2015 at 09:37:01AM -0500, Steven Rostedt wrote:
> On Mon, 26 Jan 2015 13:54:53 +0100
> Heiko Carstens <heiko.carstens@de.ibm.com> wrote:
> > s390 will use the hotpatch attribute for function tracing, therefore
> > introduce a nohotpatch define, depending on CC_USING_HOTPATCH, and add it
> > to the existing notrace define.
> 
> Are the two mutually exclusive? That is, can you have -pg and hotpatch
> together? Reason why I ask is, if you have either -pg or hotpatch, then
> we only need "no_instrument_function" or "hotpatch" in the notrace
> define, not both. But I could be wrong.

While the kernel may use only profiling or hotpatch at the same
time, Gcc is able to generate both for the same function.

Ciao

Dominik ^_^  ^_^

-- 

Dominik Vogt
IBM Germany


  parent reply	other threads:[~2015-01-27  6:19 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-26 12:54 [PATCH/RFC 0/3] ftrace: allow arch specific compile options Heiko Carstens
2015-01-26 12:54 ` [PATCH/RFC 1/3] ftrace: allow architectures to specify ftrace " Heiko Carstens
2015-01-26 12:54 ` [PATCH/RFC 2/3] ftrace: introduce nohotpatch function attribute Heiko Carstens
2015-01-26 14:37   ` Steven Rostedt
2015-01-26 15:03     ` Heiko Carstens
2015-01-26 15:22       ` Steven Rostedt
2015-01-26 15:26         ` Heiko Carstens
2015-01-27  6:19     ` Dominik Vogt [this message]
2015-01-27 14:42       ` Steven Rostedt
2015-01-28  5:36         ` Heiko Carstens
2015-01-28 11:57           ` Steven Rostedt
2015-01-28 12:18             ` Heiko Carstens
2015-01-28 12:38               ` Steven Rostedt
2015-01-26 12:54 ` [PATCH/RFC 3/3] s390/ftrace: hotpatch support for function tracing Heiko Carstens

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