linux-kernel - Re: [PATCH] sched/core: Drop debugging leftover trace

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Message-ID: <20150407103404.49028491@gandalf.local.home>
Date:	Tue, 7 Apr 2015 10:34:04 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Joe Perches <joe@...ches.com>
Cc:	Juri Lelli <juri.lelli@....com>, Borislav Petkov <bp@...en8.de>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...il.com>
Subject: Re: [PATCH] sched/core: Drop debugging leftover trace_printk call

On Tue, 07 Apr 2015 07:26:13 -0700
Joe Perches <joe@...ches.com> wrote:

> On Tue, 2015-04-07 at 10:10 -0400, Steven Rostedt wrote:
> > On Tue, 07 Apr 2015 07:01:37 -0700
> > Joe Perches <joe@...ches.com> wrote:
> > 
> > > o Please add a test for $realfile !~ m@...nel/trace/@
> > >   or maybe $realfile !~ /(?:trace|tracing)/
> > > o ERROR seems a bit strong, WARN is probably good enough
> > 
> > I'm thinking ERROR is good. There's no reason to have it. In fact, you
> > must never have it. Looking at the other ERROR() conditions, I say this
> 
> Look at trace_printk in fs/ext4/inline.c
> 

Yeah, I've stumbled on that one before and looked and said to myself
"WTF". But as it is masked around DEBUG, I let it slide. I still don't
like it, because it really should be a tracepoint instead. The problem
with trace_printk(), is that it is either all on or all off. You can
not pick and choose, and they clutter the trace.

I may send patches to remove that anyway.

> It's in a section guarded by a CONFIG_FOO_DEBUG
> block.  Is the use there an error?  Perhaps not
> and I think it better if checkpatch ERROR messages
> are more definitive.
> 
> > is just as strong and perhaps even stronger. You have ERROR() for
> > trailing white space. This is much worse than that.
> 
> I'm not much of a fan of that one, nor of most
> of the ERROR uses in checkpatch actually.
> 
> I think it might be better if all of the checkpatch
> whitespace/style related messages were WARN not ERROR.

I agree.

I still rather have this be an ERROR and not a WARN, because I rather
avoid even those that encapsulate it with CONFIG_FOO_DEBUG.

-- Steve


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