linux-kernel - Re: [PATCH 1/1] irq_work.h: fix warning when CONFIG_IRQ

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Date:	Fri, 8 Mar 2013 11:42:50 +0000
From:	James Hogan <james.hogan@...tec.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>
CC:	James Hogan <james.hogan@...tec.com>,
	<linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: Re: [PATCH 1/1] irq_work.h: fix warning when CONFIG_IRQ_WORK=n

On 08/03/13 11:36, James Hogan wrote:
> A randconfig caught repeated compiler warnings when CONFIG_IRQ_WORK=n
> due to the definition of a non-inline static function in
> <linux/irq_work.h>:
> 
> include/linux/irq_work.h +40 : warning: 'irq_work_needs_cpu' defined but not used

In addition to this warning I also got the following linker error when
CONFIG_IRQ_WORK=n:

kernel/built-in.o In function `wake_up_klogd':
(.text.wake_up_klogd+0xb4): undefined reference to `irq_work_queue'

which appears to be because of the following commit:

commit 74876a98a87a115254b3a66a14b27320b7f0acaa ("printk: Wake up klogd
using irq_work") also merged in v3.9-rc1.

Can somebody more familiar with that code please fix it.

Cheers
James

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