linux-kernel - Re: [PATCH] trace: Fix some checker warnings

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Date:   Sun, 4 Dec 2022 22:29:21 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc:     kernel test robot <lkp@...el.com>,
        David Howells <dhowells@...hat.com>,
        oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] trace: Fix some checker warnings

On Mon, 5 Dec 2022 12:11:19 +0900
Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:

> >  #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) \
> > 	|| defined(CONFIG_OSNOISE_TRACER)) && defined(CONFIG_FSNOTIFY)
> >  #define LATENCY_FS_NOTIFY
> > +#define USES_MAX_TRACE
> >  #endif
> > 
> > And use that instead.  
> 
> BTW, why can't HWLAT_TRACER and OSNOISE_TRACER depend on TRACER_MAX_TRACE?
> I think it is better to reduce combinations of those, especially partially
> enabling a feature seems a bit dangerous.

Well, the issue with that is that if the TRACER_MAX_TRACE is off
(because it's not something commonly selected), it will hide osnoise
and hwlat from showing up in the menus.

-- Steve