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entry/kvm: Explicitly flush pending rcuog wakeup before last rescheduling point

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Following the idle loop model, cleanly check for pending rcuog wakeup
before the last rescheduling point upon resuming to guest mode. This
way we can avoid to do it from rcu_user_enter() with the last resort
self-IPI hack that enforces rescheduling.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
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/20210131230548.32970-6-frederic@kernel.org
This commit is contained in:
Frederic Weisbecker 2021-02-01 00:05:48 +01:00 • committed by Ingo Molnar
parent 47b8ff194c
commit 4ae7dc97f7
4 changed files with 50 additions and 10 deletions
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1
kernel/rcu/tree_plugin.h
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@ -2197,6 +2197,7 @@ void rcu_nocb_flush_deferred_wakeup(void)
{
do_nocb_deferred_wakeup(this_cpu_ptr(&rcu_data));
}
EXPORT_SYMBOL_GPL(rcu_nocb_flush_deferred_wakeup);
void __init rcu_init_nohz(void)
{