Commit d7d34d5e authored by Paul E. McKenney's avatar Paul E. McKenney

sched: Rely on synchronize_rcu_mult() de-duplication

The synchronize_rcu_mult() function now detects duplicate requests
for the same grace-period flavor and waits only once for each flavor.
This commit therefore removes the ugly #ifdef from sched_cpu_deactivate()
because synchronize_rcu_mult(call_rcu, call_rcu_sched) now does what
the #ifdef used to be needed for.
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
parent 68ab0b42
...@@ -5874,15 +5874,9 @@ int sched_cpu_deactivate(unsigned int cpu) ...@@ -5874,15 +5874,9 @@ int sched_cpu_deactivate(unsigned int cpu)
* users of this state to go away such that all new such users will * users of this state to go away such that all new such users will
* observe it. * 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. * 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);
synchronize_rcu_mult(call_rcu, call_rcu_sched);
else
synchronize_rcu();
if (!sched_smp_initialized) if (!sched_smp_initialized)
return 0; return 0;
......
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