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rcu: Provide rcu_irq_exit_check_preempt()

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Provide a debug check which can be invoked from exception return to kernel
mode before an attempt is made to schedule. Warn if RCU is not ready for
this.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Paul E. McKenney <paulmck@kernel.org>
Link: https://lore.kernel.org/r/20200521202117.089709607@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-05-21 22:05:16 +02:00 • committed by Ingo Molnar
parent aaf2bc50df
commit 07325d4a90
3 changed files with 25 additions and 0 deletions
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6
include/linux/rcutree.h
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@ -51,6 +51,12 @@ void rcu_irq_exit_preempt(void);
void rcu_irq_enter_irqson(void);
void rcu_irq_exit_irqson(void);
#ifdef CONFIG_PROVE_RCU
void rcu_irq_exit_check_preempt(void);
#else
static inline void rcu_irq_exit_check_preempt(void) { }
#endif
void exit_rcu(void);
void rcu_scheduler_starting(void);