linux-kernel - Re: [PATCH] tracing/probe: fix typo in pr_fmt in trace

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Date:   Thu, 16 Nov 2017 09:05:38 -0800
From:   Joe Perches <joe@...ches.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Jiri Kosina <jikos@...nel.org>,
        Song Liu <songliubraving@...com>, linux-kernel@...r.kernel.org,
        kernel-team@...com, trivial@...nel.org
Subject: Re: [PATCH] tracing/probe: fix typo in pr_fmt in trace_uprobe.c

On Wed, 2017-11-15 at 21:55 -0500, Steven Rostedt wrote:
> On Wed, 15 Nov 2017 14:55:19 -0800
> Joe Perches <joe@...ches.com> wrote:
> 
> > Maybe use the much more common below instead?
> > 
> > #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> 
> Is there someplace this is documented. My git grep foo isn't finding it
> for me.

Not so far as I know.

Maybe Michal Marek or Masahiro Yamada might add some
documentation in the future about these KBUILD defines.

btw, there are about 1800 #define pr_fmt uses and most
of them use KBUILD_MODNAME

$ git grep -P "^\s*#\s*define\s+pr_fmt\b" | \
  cut -f2- -d":" | \
  sed -r 's/^\s*#\s*define\s+pr_fmt([^ ]+)\s++/#define pr_fmt\1 /' | \
  sed -r 's/\)\s+/) /' | sort | uniq -c | sort -rn | head -10
   1166 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
    134 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
     32 #define pr_fmt(fmt) "%s: " fmt, __func__
     22 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
     17 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
     13 #define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt
     11 #define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt
     10 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
     10 #define pr_fmt(fmt) "IPv6: " fmt
      9 #define pr_fmt(fmt) fmt