linux-kernel - Re: [PATCH 06/11] ftrace: add ftrace warn on to disable ftrace

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Date:	Wed, 22 Oct 2008 15:20:08 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, fweisbec@...il.com,
	sagar.abhishek@...il.com, davem@...emloft.net, tglx@...utronix.de,
	peterz@...radead.org, torvalds@...ux-foundation.org,
	srostedt@...hat.com
Subject: Re: [PATCH 06/11] ftrace: add ftrace warn on to disable ftrace


On Wed, 22 Oct 2008, Andrew Morton wrote:
> > Index: linux-compile.git/kernel/trace/ftrace.c
> > ===================================================================
> > --- linux-compile.git.orig/kernel/trace/ftrace.c	2008-10-22 13:17:29.000000000 -0400
> > +++ linux-compile.git/kernel/trace/ftrace.c	2008-10-22 13:20:11.000000000 -0400
> > @@ -32,6 +32,24 @@
> >  
> >  #include "trace.h"
> >  
> > +#define FTRACE_WARN_ON(cond)			\
> > +	do {					\
> > +		if (unlikely(cond)) {		\
> > +			WARN_ON(1);		\
> > +			ftrace_kill();		\
> > +		}				\
> > +	} while (0)
> 
> This could be coded as
> 
> 	if (WARN_ON(cond))
> 		ftrace_kill();

Ah, I didn't realize that WARN_ON returned the value of the condition.
Will update in v2.

-- Steve

> 
> > +#define FTRACE_WARN_ON_ONCE(cond)		\
> > +	do {					\
> > +		static int once;		\
> > +		if (unlikely(cond) && !once) {	\
> > +			once++;			\
> > +			WARN_ON(1);		\
> > +			ftrace_kill();		\
> > +		}				\
> > +	} while (0)
> 
> 
> 	if (WARN_ON_ONCE(cond))
> 		ftrace_kill();
> 
> 
> 
> 
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