linux-kernel - Re: [PATCH] irq_work: Fix build failure when CONFIG_IRQ

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Date:	Fri, 20 Mar 2015 11:12:10 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] irq_work: Fix build failure when CONFIG_IRQ_WORK not
 defined

On Thu, Mar 19, 2015 at 10:18:51AM -0400, Steven Rostedt wrote:
> When CONFIG_IRQ_WORK is not defined (difficult to do, as it also
> requires CONFIG_PRINTK not to be defined), we get a build failure:
> 
> kernel/built-in.o: In function `flush_smp_call_function_queue':
> kernel/smp.c:263: undefined reference to `irq_work_run'
> kernel/smp.c:263: undefined reference to `irq_work_run'
> Makefile:933: recipe for target 'vmlinux' failed
> 
> Simplest thing to do is to make irq_work_run() a nop when not set.
> 
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>

Thanks!
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