[tip:sched/core] irq_work: Fix build failure when CONFIG_IRQ_WORK is not defined

[tip-bot for Steven Rostedt]

Commit-ID:  71ad00d61ec861dc68b4544887729850e58cb99b
Gitweb:     http://git.kernel.org/tip/71ad00d61ec861dc68b4544887729850e58cb99b
Author:     Steven Rostedt <rostedt@xxxxxxxxxxx>
AuthorDate: Thu, 19 Mar 2015 10:18:51 -0400
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 23 Mar 2015 10:55:21 +0100

irq_work: Fix build failure when CONFIG_IRQ_WORK is not defined

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@xxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Link: http://lkml.kernel.org/r/20150319101851.4d224d9b@xxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 include/linux/irq_work.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/irq_work.h b/include/linux/irq_work.h
index bf3fe71..47b9ebd 100644
--- a/include/linux/irq_work.h
+++ b/include/linux/irq_work.h
@@ -38,16 +38,17 @@ bool irq_work_queue(struct irq_work *work);
 bool irq_work_queue_on(struct irq_work *work, int cpu);
 #endif
 
-void irq_work_run(void);
 void irq_work_tick(void);
 void irq_work_sync(struct irq_work *work);
 
 #ifdef CONFIG_IRQ_WORK
 #include <asm/irq_work.h>
 
+void irq_work_run(void);
 bool irq_work_needs_cpu(void);
 #else
 static inline bool irq_work_needs_cpu(void) { return false; }
+static inline void irq_work_run(void) { }
 #endif
 
 #endif /* _LINUX_IRQ_WORK_H */
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