linux-kernel - Re: [PATCH 1/1] printk: Make it compile with !CONFIG

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Message-ID: <1337013987.29436.16.camel@joe2Laptop>
Date:	Mon, 14 May 2012 09:46:27 -0700
From:	Joe Perches <joe@...ches.com>
To:	Kay Sievers <kay@...y.org>
Cc:	Hiroshi DOYU <hdoyu@...dia.com>, linux-tegra@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] printk: Make it compile with !CONFIG_PRINTK

On Mon, 2012-05-14 at 18:20 +0200, Kay Sievers wrote:
> On Mon, May 14, 2012 at 6:18 PM, Hiroshi DOYU <hdoyu@...dia.com> wrote:
> > Add missing prepend_timestamp() dummy.
> 
> That was fixed already last week:
> http://git.kernel.org/?p=linux/kernel/git/gregkh/driver-core.git;a=commitdiff;h=1fce677971e29ceaa7c569741fa9c685a7b1052a

Yup, but in my opinion, this particular fix shouldn't be
necessary because the CONFIG_PRINTK bits should have better
code separation.

None of the code that calls prepend_timestamp should
actually be compiled in when !CONFIG_PRINTK.

The same is true for unnecessary uses like the existing
per-cpu:

static DEFINE_PER_CPU(int, printk_pending);
static DEFINE_PER_CPU(char [PRINTK_BUF_SIZE], printk_sched_buf);

After this patchset is accepted into mainline, I'll revive
the modularization and move of kernel/printk.c and associated
files into -> kernel/printk/* patch I did awhile ago.

I'll follow-on to this message with the original patches
just as an fyi/rfc.

cheers, Joe

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