netdev - Re: [PATCH 1/2] net/netfilter/ipvs: Move #define KMSG

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Date:	Wed, 30 Sep 2009 17:50:35 -0700
From:	Joe Perches <joe@...ches.com>
To:	Jan Engelhardt <jengelh@...ozas.de>
Cc:	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	Simon Horman <horms@...ge.net.au>,
	Julian Anastasov <ja@....bg>, netfilter-devel@...r.kernel.org,
	coreteam@...filter.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, lvs-devel@...r.kernel.org
Subject: Re: [PATCH 1/2] net/netfilter/ipvs: Move #define KMSG_COMPONENT to
 Makefile

On Thu, 2009-10-01 at 02:31 +0200, Jan Engelhardt wrote:
> KBUILD_MODNAME is special in that it is derived from the actual
> source filename.

Kind of.  It's derived from the module name, not the filename.

> Of course you could put #define KBUILD_MODNAME "foo"
> in your source file, but that is like putting changelogs there
> when they belong into the git log.

I agree with that.

> Well I personally prefer the #include instead of hiding such in 
> Makefiles. You know, when newcomers could start doing `grep 
> KMSG_COMPONENT *.[ch]`. Perhaps GCC's -include flag in a Makefile
> to avoid #includes in .c files?

I imagine an eventual goal of standardizing the default
pr_fmt define in kernel.h to

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

so that all pr_<level> calls get this unless otherwise
specified.

Or perhaps better, to get rid of pr_fmt(fmt) altogether and
have printk emit the filename/modulename, function and/or
code offset by using something like %pS after the level.

I see the Makefile use, which I don't really like too much
because of the information hiding, as an intermediate step
until that's possible.


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