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rcu: Make __call_rcu() handle invocation from idle

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Although __call_rcu() is handled correctly when called from a momentary
non-idle period, if it is called on a CPU that RCU believes to be idle
on RCU_FAST_NO_HZ kernels, the callback might be indefinitely postponed.
This commit therefore ensures that RCU is aware of the new callback and
has a chance to force the CPU out of dyntick-idle mode when a new callback
is posted.

Reported-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney 2012-05-22 22:10:24 -07:00 • committed by Paul E. McKenney
parent 28f5c693d0
commit 62fde6edf1
2 changed files with 13 additions and 15 deletions
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13
include/linux/rcupdate.h
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@ -256,6 +256,10 @@ static inline void destroy_rcu_head_on_stack(struct rcu_head *head)
}
#endif /* #else !CONFIG_DEBUG_OBJECTS_RCU_HEAD */
#if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SMP)
extern int rcu_is_cpu_idle(void);
#endif /* #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SMP) */
#if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PROVE_RCU)
bool rcu_lockdep_current_cpu_online(void);
#else /* #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PROVE_RCU) */
@ -267,15 +271,6 @@ static inline bool rcu_lockdep_current_cpu_online(void)
#ifdef CONFIG_DEBUG_LOCK_ALLOC
#ifdef CONFIG_PROVE_RCU
extern int rcu_is_cpu_idle(void);
#else /* !CONFIG_PROVE_RCU */
static inline int rcu_is_cpu_idle(void)
{
return 0;
}
#endif /* else !CONFIG_PROVE_RCU */
static inline void rcu_lock_acquire(struct lockdep_map *map)
{
lock_acquire(map, 0, 0, 2, 1, NULL, _THIS_IP_);