[PATCH] irq_work: Fix build failure when CONFIG_IRQ_WORK not defined

From: Steven Rostedt
Date: Thu Mar 19 2015 - 10:19:00 EST

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>
diff --git a/include/linux/irq_work.h b/include/linux/irq_work.h
index bf3fe719c7ce..47b9ebd4a74f 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);

-void irq_work_run(void);
void irq_work_tick(void);
void irq_work_sync(struct irq_work *work);

#include <asm/irq_work.h>

+void irq_work_run(void);
bool irq_work_needs_cpu(void);
static inline bool irq_work_needs_cpu(void) { return false; }
+static inline void irq_work_run(void) { }

#endif /* _LINUX_IRQ_WORK_H */
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