[PATCH] include/linux/smp.h: define __smp_call_function_single for!CONFIG_SMP

[Michal Hocko]

This function was not needed until (watchdog: update watchdog_tresh
properly) which cannot use on_each_cpu unfortunately as
watchdog_nmi_enable relies on perf_event_alloc which is might sleep.

Export it as an alias to on_each_cpu for !CONFIG_SMP.

Reported-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
Signed-off-by: Michal Hocko <mhocko@xxxxxxx>
---
 include/linux/smp.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/smp.h b/include/linux/smp.h
index c848876..3d12d72 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -151,6 +151,12 @@ static inline int on_each_cpu(smp_call_func_t func, void *info, int wait)
 	return 0;
 }
 
+static inline void __smp_call_function_single(int cpuid,
+		struct call_single_data *data, int wait)
+{
+	on_each_cpu(data->func, data->info, wait);
+}
+
 /*
  * Note we still need to test the mask even for UP
  * because we actually can get an empty mask from
-- 
1.8.3.2

-- 
Michal Hocko
SUSE Labs
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