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-rw-r--r--kernel/cpu.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 973d034..deff2e6 100644
--- 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().
*/
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