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-rw-r--r--include/linux/cpu.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index e287863ac053..4823af64e9db 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -48,6 +48,33 @@ extern ssize_t arch_cpu_release(const char *, size_t);
#endif
struct notifier_block;
+/*
+ * CPU notifier priorities.
+ */
+enum {
+ /*
+ * SCHED_ACTIVE marks a cpu which is coming up active during
+ * CPU_ONLINE and CPU_DOWN_FAILED and must be the first
+ * notifier. CPUSET_ACTIVE adjusts cpuset according to
+ * cpu_active mask right after SCHED_ACTIVE. During
+ * CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are
+ * ordered in the similar way.
+ *
+ * This ordering guarantees consistent cpu_active mask and
+ * migration behavior to all cpu notifiers.
+ */
+ CPU_PRI_SCHED_ACTIVE = INT_MAX,
+ CPU_PRI_CPUSET_ACTIVE = INT_MAX - 1,
+ CPU_PRI_SCHED_INACTIVE = INT_MIN + 1,
+ CPU_PRI_CPUSET_INACTIVE = INT_MIN,
+
+ /* migration should happen before other stuff but after perf */
+ CPU_PRI_PERF = 20,
+ CPU_PRI_MIGRATION = 10,
+ /* prepare workqueues for other notifiers */
+ CPU_PRI_WORKQUEUE = 5,
+};
+
#ifdef CONFIG_SMP
/* Need to know about CPUs going up/down? */
#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)