workqueue: reimplement CPU hotplugging support using trustee

[mv-sheeva.git] / include / linux / cpu.h

diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index e287863ac053d9788756ac79c9271ba562d455b1..4823af64e9db2148c23e1ae4d0ad3fe21de4368a 100644 (file)
--- 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)