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

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Message-ID: <CANMq1KCoEZVj=sjxCqBhqLZKBab57+82=Rk_LN7fc3aCuNHMUw@mail.gmail.com>
Date:   Fri, 21 Aug 2020 08:13:00 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     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, lkml <linux-kernel@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>
Subject: Re: [PATCH v4 3/3] media: atomisp: Only use trace_printk if allowed

On Thu, Aug 20, 2020 at 10:23 PM Steven Rostedt <rostedt@...dmis.org> wrote:
>
> On Thu, 20 Aug 2020 17:14:12 +0800
> Nicolas Boichat <drinkcat@...omium.org> wrote:
>
> > Technically, we could only initialize the trace_printk buffers
> > when the print env is switched, to avoid the build error and
> > unconditional boot-time warning, but I assume this printing
> > framework will eventually get removed when the driver moves out
> > of staging?
>
> Perhaps this should be converting into a trace event. Look at what bpf
> did for their bpf_trace_printk().
>
> The more I think about it, the less I like this series.

To make it clear, the primary goal of this series is to get rid of
trace_printk sprinkled in the kernel by making sure some randconfig
builds fail. Since my v2, there already has been one more added (the
one that this patch removes), so I'd like to land 2/3 ASAP to prevent
even more from being added.

Looking at your reply on 1/3, I think we are aligned on that goal? Is
there some other approach you'd recommend?

Now, I'm not pretending my fixes are the best possible ones, but I
would much rather have the burden of converting to trace events on the
respective driver maintainers. (btw is there a short
documentation/tutorial that I could link to in these patches, to help
developers understand what is the recommended way now?)

Thanks,

>
> -- Steve