linux-kernel - Re: [PATCH] do not call trace

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Message-ID: <20180426214657.612623a3@gandalf.local.home>
Date:   Thu, 26 Apr 2018 21:46:57 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Wei Wang <wvw@...gle.com>
Cc:     gregkh@...uxfoundation.org, Wei Wang <wei.vince.wang@...il.com>,
        Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Crt Mori <cmo@...exis.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-kernel@...r.kernel.org, Joe Perches <joe@...ches.com>
Subject: Re: [PATCH] do not call trace_printk on non-debug build

On Wed, 25 Apr 2018 04:53:33 +0000
Wei Wang <wvw@...gle.com> wrote:

> On Tue, Apr 24, 2018 at 12:26 PM Steven Rostedt <rostedt@...dmis.org> wrote:
> > A lot of kernel developers use trace_printk() and I want to make it as
> > easy to use as possible. I don't want to add a config to enable it,
> > because that would be something that could be rather annoying.  
> 
> > Let's add it to checkpatch and see if that can draining the swamp of
> > abusers.  
> 
> 
> Currently I see f2fs trace is using this when having CONFIG_F2FS_IO_TRACE,
> so I am not sure how checkpatch would work. How about we add a BUILD_BUG
> surrounded by a config which would let us flag abuse easily on build time?

I don't want a config to have to be set for adding this. That would
really irritate myself, as I constantly take configs from others for
debugging purposes and then slam trace_printk() all over the place. It
would be annoying to have to remember to enable a config. And having a
config would also change the way the kernel gets built, and for
debugging the less variables the better.

But you are correct. I see lots of abusers with trace_printk(). I think
it's time for me to start removing them.

-- Steve