The following commit has been merged into the sched/core branch of tip:
Commit-ID: e4234f21d2ea7674bcc1aeaca9d382b50ca1efec Gitweb: https://git.kernel.org/tip/e4234f21d2ea7674bcc1aeaca9d382b50ca1efec Author: Frederic Weisbecker frederic@kernel.org AuthorDate: Mon, 01 Feb 2021 00:05:44 +01:00 Committer: Peter Zijlstra peterz@infradead.org CommitterDate: Wed, 10 Feb 2021 14:44:49 +01:00
rcu: Pull deferred rcuog wake up to rcu_eqs_enter() callers
Deferred wakeup of rcuog kthreads upon RCU idle mode entry is going to be handled differently whether initiated by idle, user or guest. Prepare with pulling that control up to rcu_eqs_enter() callers.
Signed-off-by: Frederic Weisbecker frederic@kernel.org Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20210131230548.32970-2-frederic@kernel.org --- kernel/rcu/tree.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 40e5e3d..63032e5 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -644,7 +644,6 @@ static noinstr void rcu_eqs_enter(bool user) trace_rcu_dyntick(TPS("Start"), rdp->dynticks_nesting, 0, atomic_read(&rdp->dynticks)); WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && !user && !is_idle_task(current)); rdp = this_cpu_ptr(&rcu_data); - do_nocb_deferred_wakeup(rdp); rcu_prepare_for_idle(); rcu_preempt_deferred_qs(current);
@@ -672,7 +671,10 @@ static noinstr void rcu_eqs_enter(bool user) */ void rcu_idle_enter(void) { + struct rcu_data *rdp = this_cpu_ptr(&rcu_data); + lockdep_assert_irqs_disabled(); + do_nocb_deferred_wakeup(rdp); rcu_eqs_enter(false); } EXPORT_SYMBOL_GPL(rcu_idle_enter); @@ -691,7 +693,14 @@ EXPORT_SYMBOL_GPL(rcu_idle_enter); */ noinstr void rcu_user_enter(void) { + struct rcu_data *rdp = this_cpu_ptr(&rcu_data); + lockdep_assert_irqs_disabled(); + + instrumentation_begin(); + do_nocb_deferred_wakeup(rdp); + instrumentation_end(); + rcu_eqs_enter(true); } #endif /* CONFIG_NO_HZ_FULL */