sched/core: Better document the try_to_wake_up() barriers

[cascardo/linux.git] / kernel / sched / sched.h

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index efd3bfc..b242775 100644 (file)
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1073,6 +1073,9 @@ static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev)
         * We must ensure this doesn't happen until the switch is completely
         * finished.
         *
+        * In particular, the load of prev->state in finish_task_switch() must
+        * happen before this.
+        *
         * Pairs with the control dependency and rmb in try_to_wake_up().
         */
        smp_store_release(&prev->on_cpu, 0);