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[PATCH] smp_call_function_single() check that local interrupts are enabled
[sfrench/cifs-2.6.git]
/
arch
/
i386
/
kernel
/
smp.c
diff --git
a/arch/i386/kernel/smp.c
b/arch/i386/kernel/smp.c
index 31e5c6573aae450b3a1f94fe7129de94fc4ea26e..9827cf927ecb2c49223d6bc856a15c48151a5e06 100644
(file)
--- a/
arch/i386/kernel/smp.c
+++ b/
arch/i386/kernel/smp.c
@@
-699,6
+699,10
@@
int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
put_cpu();
return -EBUSY;
}
+
+ /* Can deadlock when called with interrupts disabled */
+ WARN_ON(irqs_disabled());
+
spin_lock_bh(&call_lock);
__smp_call_function_single(cpu, func, info, nonatomic, wait);
spin_unlock_bh(&call_lock);