The patch below does not apply to the 3.9-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From 690cec8e70c211d1f5f6e520b21a68d0306173b6 Mon Sep 17 00:00:00 2001
From: Ben Hutchings <[email protected]>
Date: Fri, 14 Jun 2013 01:18:44 +0100
Subject: [PATCH] s390/irq: Only define synchronize_irq() on SMP

In uniprocessor configurations, synchronize_irq() is defined in
<linux/hardirq.h> as a macro, and this function definition fails to
compile.

Reported-by: kbuild test robot <[email protected]>
Signed-off-by: Ben Hutchings <[email protected]>
Cc: [email protected] # 3.9
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>

diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index 408e866..dd3c199 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -312,6 +312,7 @@ void measurement_alert_subclass_unregister(void)
 }
 EXPORT_SYMBOL(measurement_alert_subclass_unregister);
 
+#ifdef CONFIG_SMP
 void synchronize_irq(unsigned int irq)
 {
        /*
@@ -320,6 +321,7 @@ void synchronize_irq(unsigned int irq)
         */
 }
 EXPORT_SYMBOL_GPL(synchronize_irq);
+#endif
 
 #ifndef CONFIG_PCI
 

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