linux-kernel - Re: [PATCH] tracing/events: fix a typo in _

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Message-ID: <20090531142107.GB6013@nowhere>
Date:	Sun, 31 May 2009 16:21:08 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tracing/events: fix a typo in __string() format output

On Sun, May 31, 2009 at 01:58:23PM +0800, Li Zefan wrote:
> ping..
> 
> Could someone apply this patch? I have a patchset, that
> introduces __dynamic_array(), based on this fix.

I've applied it on
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing.git tracing/core

Since we have doubts on the strncmp -> strcmp conversion for static
string arrays. Do you think you could cut your strcmp patch in two parts:

1) fix strncmp use in __string() filters (which drops strncmp for dyn strings)
2) convert static string comparison to use strcmp()

So that I can integrate the fix from 1) and submit it to Ingo with
the fix for __str_loc format I just applied.

And then we can review 2) more carefully.

Thanks,
Frederic.

 
> Or I will include this fix in the patchset.
> 
> Li Zefan wrote:
> > It should be '\t'. Also remove the space before "__str_loc".
> > 
> > Before:
> >  # cat tracing/events/irq/irq_handler_entry/format
> >         ...
> >         field:int irq;  offset:12;      size:4;
> >         field: __str_loc name;  offset:16;tsize:2;
> >         ...
> > 
> > After:
> >  # cat tracing/events/irq/irq_handler_entry/format
> > 	...
> >         field:int irq;  offset:12;      size:4;
> >         field:__str_loc name;   offset:16;      size:2;
> > 	...
> > 
> > [ Impact: fix the output of __string field in format file ]
> > 
> > Signed-off-by: Li Zefan <lizf@...fujitsu.com>
> > ---
> >  include/trace/ftrace.h |    4 ++--
> >  1 files changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
> > index edb02bc..006af4c 100644
> > --- a/include/trace/ftrace.h
> > +++ b/include/trace/ftrace.h
> > @@ -187,8 +187,8 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags)	\
> >  
> >  #undef __string
> >  #define __string(item, src)						       \
> > -	ret = trace_seq_printf(s, "\tfield: __str_loc " #item ";\t"	       \
> > -			       "offset:%u;tsize:%u;\n",			       \
> > +	ret = trace_seq_printf(s, "\tfield:__str_loc " #item ";\t"	       \
> > +			       "offset:%u;\tsize:%u;\n",		       \
> >  			       (unsigned int)offsetof(typeof(field),	       \
> >  					__str_loc_##item),		       \
> >  			       (unsigned int)sizeof(field.__str_loc_##item));  \
> 

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