| From | "Paul E. McKenney" <> | Subject | [PATCH tip/core/rcu 43/88] sched: Rely on synchronize_rcu_mult() de-duplication | Date | Thu, 25 May 2017 14:59:16 -0700 |
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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: Paul 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> --- kernel/sched/core.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 759f4bd52cd6..605564742de1 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5849,15 +5849,9 @@ int sched_cpu_deactivate(unsigned int cpu) * 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(); + synchronize_rcu_mult(call_rcu, call_rcu_sched); if (!sched_smp_initialized) return 0; -- 2.5.2
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