evie/android_kernel_oneplus_msm8998
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Merge "Revert "sched: Remove synchronize rcu/sched calls from _cpu_down""

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Linux Build Service Account 2017-07-17 18:40:09 -07:00 • committed by Gerrit - the friendly Code Review server
commit b1b3c5a65e
1 changed files with 15 additions and 0 deletions

15
kernel/cpu.c
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@ -375,6 +375,21 @@ static int _cpu_down(unsigned int cpu, int tasks_frozen)
goto out_release;
}
/*
* By now we've cleared cpu_active_mask, wait for all preempt-disabled
* and RCU users of this state to go away such that all new such users
* will observe it.
*
* For CONFIG_PREEMPT we have preemptible RCU and its sync_rcu() might
* not imply sync_sched(), so wait for both.
*
* Do sync before park smpboot threads to take care the rcu boost case.
*/
if (IS_ENABLED(CONFIG_PREEMPT))
synchronize_rcu_mult(call_rcu, call_rcu_sched);
else
synchronize_rcu();
smpboot_park_threads(cpu);
/*