ath10k: add trace event for WMI_DEBUG_MESG_EVENTID

[cascardo/linux.git] / kernel / cpu.c

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 973d034..deff2e6 100644 (file)
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -306,7 +306,6 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
                                __func__, cpu);
                goto out_release;
        }
-       smpboot_park_threads(cpu);
 
        /*
         * By now we've cleared cpu_active_mask, wait for all preempt-disabled
@@ -315,12 +314,16 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
         *
         * For CONFIG_PREEMPT we have preemptible RCU and its sync_rcu() might
         * not imply sync_sched(), so explicitly call both.
+        *
+        * Do sync before park smpboot threads to take care the rcu boost case.
         */
 #ifdef CONFIG_PREEMPT
        synchronize_sched();
 #endif
        synchronize_rcu();
 
+       smpboot_park_threads(cpu);
+
        /*
         * So now all preempt/rcu users must observe !cpu_active().
         */