linux-kernel - RE: [PATCH v4 3/3] media: atomisp: Only use trace

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Date:   Fri, 21 Aug 2020 12:18:28 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Nicolas Boichat' <drinkcat@...omium.org>
CC:     Steven Rostedt <rostedt@...dmis.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "Linux Media Mailing List" <linux-media@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: RE: [PATCH v4 3/3] media: atomisp: Only use trace_printk if allowed

From: Nicolas Boichat
> Sent: 21 August 2020 13:07
...
> > You might also want a #define that can set temporarily
> > to enable traces in a specific file/module even though
> > CONFIG_TRACE=n.
> 
> I don't understand how traces are supposed to work with CONFIG_TRACE=n?

Probably because I meant something different :-)

You want the kernel built so that there are no (expanded)
calls to trace_printf() but with support for modules that
contain them.

Then I can load a module into a distro kernel that
contains trace_printf() calls for debug testing.

Which is why I was suggesting a config option that
only rand-config builds would ever set that would
cause the calls to generate compile-time errors.

	David

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