Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[linux-2.6-block.git] / include / linux / sched.h

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 8cc8e323093f7e79f22401fb187db42e6a3fbd78..b75b282870053e083a1f79ae9b55cba6a95caa74 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -276,6 +276,11 @@ enum uclamp_id {
        UCLAMP_CNT
 };
 
+#ifdef CONFIG_SMP
+extern struct root_domain def_root_domain;
+extern struct mutex sched_domains_mutex;
+#endif
+
 struct sched_info {
 #ifdef CONFIG_SCHED_INFO
        /* Cumulative counters: */
@@ -1071,7 +1076,15 @@ struct task_struct {
        u64                             last_sum_exec_runtime;
        struct callback_head            numa_work;
 
-       struct numa_group               *numa_group;
+       /*
+        * This pointer is only modified for current in syscall and
+        * pagefault context (and for tasks being destroyed), so it can be read
+        * from any of the following contexts:
+        *  - RCU read-side critical section
+        *  - current->numa_group from everywhere
+        *  - task's runqueue locked, task not running
+        */
+       struct numa_group __rcu         *numa_group;
 
        /*
         * numa_faults is an array split into four regions:
@@ -1738,7 +1751,7 @@ static inline int test_tsk_need_resched(struct task_struct *tsk)
  * value indicates whether a reschedule was done in fact.
  * cond_resched_lock() will drop the spinlock before scheduling,
  */
-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
 extern int _cond_resched(void);
 #else
 static inline int _cond_resched(void) { return 0; }
@@ -1767,12 +1780,12 @@ static inline void cond_resched_rcu(void)
 
 /*
  * Does a critical section need to be broken due to another
- * task waiting?: (technically does not depend on CONFIG_PREEMPT,
+ * task waiting?: (technically does not depend on CONFIG_PREEMPTION,
  * but a general need for low latency)
  */
 static inline int spin_needbreak(spinlock_t *lock)
 {
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
        return spin_is_contended(lock);
 #else
        return 0;