linux-kernel - Re: [PATCH] checkpatch: check for missing \n at the end of logging message

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Date:   Thu, 9 Apr 2020 19:34:12 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     linux-kernel@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] checkpatch: check for missing \n at the end of logging
 message

Le 09/04/2020 à 17:29, Joe Perches a écrit :
> On Thu, 2020-04-09 at 09:24 +0200, Christophe JAILLET wrote:
>> I think that, at least printk(), WARN() and co, and panic() should also
>> be handled the same way.
> Maybe.
>
>> A few files (5 according to my grep) also have something like:
>>      #define pr_fmt(fmt) "bcache: %s()" fmt "\n", __func__
>> and then sometimes a mix of pr_xxx() with either trailing \n or not.
> Didn't know about those.
>
>> Maybe those should be handled manually to be consistent and avoid a "\n"
>> in pr_fmt which is not widely used in other files
> More likely the pr_fmt should have the \n removed and added
> to the uses.
Yes agreed.
> $ git grep -P 'define\s+pr_fmt.*\\n'
> drivers/clocksource/timer-davinci.c:#define pr_fmt(fmt) "%s: " fmt "\n", __func__
https://marc.info/?l=linux-kernel&m=158642435216181&w=4 (which has been 
acked)

> lib/math/prime_numbers.c:#define pr_fmt(fmt) "prime numbers: " fmt "\n"
> lib/test_hash.c:#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt "\n"
Patches proposed.
> lib/percpu-refcount.c:#define pr_fmt(fmt) "%s: " fmt "\n", __func__
In this file, there are some WARN_ON.
Are these log functions also influenced by pr_fmt?
> drivers/md/bcache/bcache.h:#define pr_fmt(fmt) "bcache: %s() " fmt "\n", __func__
> drivers/md/bcache/bset.c:#define pr_fmt(fmt) "bcache: %s() " fmt "\n", __func__
> tools/usb/usbip/libsrc/usbip_common.h:#define pr_fmt(fmt)       "%s: %s: " fmt "\n", PROGNAME

Tricky because all files that include it have to be checked.
I won't touch these ones.

CJ