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rcu/tree: Move kfree_rcu_cpu locking/unlocking to separate functions
Introduce helpers to lock and unlock per-cpu "kfree_rcu_cpu" structures. That will make kfree_call_rcu() more readable and prevent programming errors. Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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@ -3035,6 +3035,27 @@ debug_rcu_bhead_unqueue(struct kfree_rcu_bulk_data *bhead)
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#endif
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}
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static inline struct kfree_rcu_cpu *
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krc_this_cpu_lock(unsigned long *flags)
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{
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struct kfree_rcu_cpu *krcp;
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local_irq_save(*flags); // For safely calling this_cpu_ptr().
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krcp = this_cpu_ptr(&krc);
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if (likely(krcp->initialized))
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raw_spin_lock(&krcp->lock);
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return krcp;
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}
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static inline void
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krc_this_cpu_unlock(struct kfree_rcu_cpu *krcp, unsigned long flags)
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{
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if (likely(krcp->initialized))
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raw_spin_unlock(&krcp->lock);
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local_irq_restore(flags);
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}
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/*
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* This function is invoked in workqueue context after a grace period.
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* It frees all the objects queued on ->bhead_free or ->head_free.
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@ -3260,11 +3281,7 @@ void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func)
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struct kfree_rcu_cpu *krcp;
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void *ptr;
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local_irq_save(flags); // For safely calling this_cpu_ptr().
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krcp = this_cpu_ptr(&krc);
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if (krcp->initialized)
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raw_spin_lock(&krcp->lock);
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krcp = krc_this_cpu_lock(&flags);
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ptr = (void *)head - (unsigned long)func;
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// Queue the object but don't yet schedule the batch.
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@ -3295,9 +3312,7 @@ void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func)
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}
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unlock_return:
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if (krcp->initialized)
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raw_spin_unlock(&krcp->lock);
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local_irq_restore(flags);
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krc_this_cpu_unlock(krcp, flags);
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}
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EXPORT_SYMBOL_GPL(kfree_call_rcu);
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