linux-kernel - Re: [patch 08/17] LTTng instrumentation

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Date:	Thu, 24 Jul 2008 11:13:46 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Hideo AOKI <haoki@...hat.com>,
	Takashi Nishiie <t-nishiie@...css.fujitsu.com>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
Subject: Re: [patch 08/17] LTTng instrumentation - kernel


On Thu, 24 Jul 2008, Mathieu Desnoyers wrote:
>
> * Steven Rostedt (rostedt@...dmis.org) wrote:
> >
> >
> > On Tue, 15 Jul 2008, Mathieu Desnoyers wrote:
> > >
> > >  /*
> > >   * Low level drivers may need that to know if they can schedule in
> > > @@ -601,6 +603,7 @@ asmlinkage int printk(const char *fmt, .
> > >  	int r;
> > >
> > >  	va_start(args, fmt);
> > > +	trace_kernel_printk(__builtin_return_address(0));
> >
> > BTW, ftrace.h has macros that let you use CALLER_ADDR0 for
> > __builtin_return_address. It also converts it from a pointer to a long,
> > but makes the code look prettier.
> >
>
> include/linux/kernel.h:#define _RET_IP_   (unsigned long)__builtin_return_address(0)
>
> Hrm, did not see this one. So I guess we can both switch to it ?

Hmm, yeah, I forgot about that. Someplaces I do use CALLER_ADDR1 and
higher, but when it is just CALLER_ADDR0, then _RET_IP_ would probably be
better.

>
> Thanks for pointing this out,

-- Steve

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