linux-kernel - Re: [PATCH 01/22] m68k/atari: Modernize printing of kernel messages

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Date:   Sat, 10 Dec 2016 13:44:39 +1300
From:   Michael Schmitz <schmitzmic@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Finn Thain <fthain@...egraphics.com.au>
Cc:     Greg Ungerer <gerg@...ux-m68k.org>, Sam Creasey <sammy@...my.net>,
        Joshua Thompson <funaho@...ai.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/22] m68k/atari: Modernize printing of kernel messages

Hi Geert,

Am 09.12.2016 um 01:22 schrieb Geert Uytterhoeven:
> On Wed, Dec 7, 2016 at 11:36 PM, Finn Thain <fthain@...egraphics.com.au> wrote:
>> On Wed, 7 Dec 2016, Geert Uytterhoeven wrote:
>>>   - Convert from printk() to pr_*(),
>>>   - Add missing continuations, to fix user-visible breakage,
>>>   - Drop useless WARNING prefix,
>>>   - Move trailing spaces to start of continuations.
>>>
>>> Fixes: 4bcc595ccd80decb ("printk: reinstate KERN_CONT for printing continuation lines")
>>> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>>> ---
>>>  arch/m68k/atari/atakeyb.c | 14 ++++++------
>>>  arch/m68k/atari/config.c  | 56 +++++++++++++++++++++++------------------------
>>>  2 files changed, 35 insertions(+), 35 deletions(-)
>>>
>>> diff --git a/arch/m68k/atari/atakeyb.c b/arch/m68k/atari/atakeyb.c
>>> index 264db11268039329..37091898adb3d3b5 100644
>>> --- a/arch/m68k/atari/atakeyb.c
>>> +++ b/arch/m68k/atari/atakeyb.c
>>> @@ -149,7 +149,7 @@ static irqreturn_t atari_keyboard_interrupt(int irq, void *dummy)
>>>       if (acia_stat & ACIA_OVRN) {
>>>               /* a very fast typist or a slow system, give a warning */
>>>               /* ...happens often if interrupts were disabled for too long */
>>> -             printk(KERN_DEBUG "Keyboard overrun\n");
>>> +             pr_debug("Keyboard overrun\n");
>>>               scancode = acia.key_data;
>>>               if (ikbd_self_test)
>>>                       /* During self test, don't do resyncing, just process the code */
>>
>> This is not equivalent (unless there is a DEBUG macro definition hinding
>> in a header file somewhere). Since the changelog doesn't mention
>> suppressing any output, perhaps you were deceived by the questionable API,
>> as I have been in the past (see 16b9d870a0 and d61c5427f6).
> 
> This is an actual message people want to see in the kernel log, even

No, it's not something people want to see - clutters up the screen, and
causes even more interrupt hogging disk IO from syslogd so exacerbates
the problem on slow systems.

But Finn is right in that output is now suppressed instead of given a
particular log level. IMO stating that the message will now only be
generated when the kernel has been compiled for debugging would be
perfectly fine.

Cheers,

	Michael


> when not debugging?
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
> --
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