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authorPeter Zijlstra <peterz@infradead.org>2016-03-10 12:54:14 +0100
committerThomas Gleixner <tglx@linutronix.de>2016-05-06 14:58:24 +0200
commitb2454caa8977ade27292a71f2def5e403e24b4d5 (patch)
treeaead0505616aa4402a99f4a85bf2dc6d001e2a4a /kernel/cpu.c
parent40190a78f85fec29f0fdd21f6b4415712085711e (diff)
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op-kernel-dev-b2454caa8977ade27292a71f2def5e403e24b4d5.tar.gz
sched/hotplug: Move sync_rcu to be with set_cpu_active(false)
The sync_rcu stuff is specificically for clearing bits in the active mask, such that everybody will observe the bit cleared and will not consider the cleared CPU for load-balancing etc. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: rt@linutronix.de Link: http://lkml.kernel.org/r/20160310120025.169219710@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/cpu.c')
-rw-r--r--kernel/cpu.c15
1 files changed, 0 insertions, 15 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 15402b7..c134a35 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -703,21 +703,6 @@ static int takedown_cpu(unsigned int cpu)
struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu);
int err;
- /*
- * 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();
-
/* Park the smpboot threads */
kthread_park(per_cpu_ptr(&cpuhp_state, cpu)->thread);
smpboot_park_threads(cpu);
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