linux-kernel - Re: [PATCH v2 23/24] kset-example: add pr_debug()s for easy visibility of its operation

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Date:   Mon, 15 Jun 2020 16:18:38 -0600
From:   jim.cromie@...il.com
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Jason Baron <jbaron@...mai.com>,
        LKML <linux-kernel@...r.kernel.org>, akpm@...uxfoundation.org,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: Re: [PATCH v2 23/24] kset-example: add pr_debug()s for easy
 visibility of its operation

On Sun, Jun 14, 2020 at 12:05 AM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Sat, Jun 13, 2020 at 09:57:37AM -0600, Jim Cromie wrote:
> > put pr_debug()s into most functions, to easily see code operate when
> > module is loaded and used.
> >
> >   #> dmesg -w &
> >   #> modprobe kset-example dyndbg=+pfml
> >   #> cat /sys/kernel/kset-example/*/*
> > ---

> >  static int __init example_init(void)
> >  {
> > +     pr_debug("called");
>
> Why???  If you want to do something like this, use ftrace, that is what
> it is for.
>
> thanks,
>
> greg k-h


mostly I needed an easy place to try out pr_debug_n  in the next patch.
if that next patch seems like a good anti-pattern for pr_debug_n use/misuse,
then I could combine the 2, and add a 'dont do this, use ftrace' comment too.
or not, of course.