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rcu: Pull deferred rcuog wake up to rcu_eqs_enter() callers

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commit 54b7429efffc99e845ba9381bee3244f012a06c2 upstream.

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>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20210131230548.32970-2-frederic@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Frederic Weisbecker 2021-02-01 00:05:44 +01:00 committed by Greg Kroah-Hartman
parent 6f7e5b49f6
commit 20b7669fa3
1 changed files with 10 additions and 1 deletions
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11
kernel/rcu/tree.c
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@ -636,7 +636,6 @@ 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);
@ -664,7 +663,10 @@ 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);
@ -683,7 +685,14 @@ 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 */