sched: define and use CPU_PRI_* enums for cpu notifier priorities

Instead of hardcoding priority 10 and 20 in sched and perf, collect
them into CPU_PRI_* enums.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 10 insertions, 1 deletions

diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index e287863ac053..2d9073883ea9 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -48,6 +48,15 @@ extern ssize_t arch_cpu_release(const char *, size_t);
 #endif
 struct notifier_block;
 
+/*
+ * CPU notifier priorities.
+ */
+enum {
+        /* migration should happen before other stuff but after perf */
+        CPU_PRI_PERF            = 20,
+        CPU_PRI_MIGRATION       = 10,
+};
+
 #ifdef CONFIG_SMP
 /* Need to know about CPUs going up/down? */
 #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 5d0266d94985..469e03e96fe7 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1068,7 +1068,7 @@ static inline void perf_event_disable(struct perf_event *event)		{ }
 #define perf_cpu_notifier(fn)                                   \
 do {                                                            \
         static struct notifier_block fn##_nb __cpuinitdata =    \
-                { .notifier_call = fn, .priority = 20 };        \
+                { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
         fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE,             \
                 (void *)(unsigned long)smp_processor_id());     \
         fn(&fn##_nb, (unsigned long)CPU_STARTING,               \