forked from Minki/linux
percpu_ref: relocate percpu_ref_reinit()
percpu_ref is gonna go through restructuring. Move percpu_ref_reinit() after percpu_ref_kill_and_confirm(). This will make later changes easier to follow and result in cleaner organization. Signed-off-by: Tejun Heo <tj@kernel.org> Reviewed-by: Kent Overstreet <kmo@daterainc.com>
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@ -68,10 +68,10 @@ struct percpu_ref {
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int __must_check percpu_ref_init(struct percpu_ref *ref,
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percpu_ref_func_t *release, gfp_t gfp);
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void percpu_ref_reinit(struct percpu_ref *ref);
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void percpu_ref_exit(struct percpu_ref *ref);
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void percpu_ref_kill_and_confirm(struct percpu_ref *ref,
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percpu_ref_func_t *confirm_kill);
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void percpu_ref_reinit(struct percpu_ref *ref);
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/**
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* percpu_ref_kill - drop the initial ref
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@ -62,41 +62,6 @@ int percpu_ref_init(struct percpu_ref *ref, percpu_ref_func_t *release,
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}
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EXPORT_SYMBOL_GPL(percpu_ref_init);
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/**
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* percpu_ref_reinit - re-initialize a percpu refcount
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* @ref: perpcu_ref to re-initialize
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*
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* Re-initialize @ref so that it's in the same state as when it finished
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* percpu_ref_init(). @ref must have been initialized successfully, killed
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* and reached 0 but not exited.
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*
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* Note that percpu_ref_tryget[_live]() are safe to perform on @ref while
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* this function is in progress.
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*/
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void percpu_ref_reinit(struct percpu_ref *ref)
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{
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unsigned long __percpu *pcpu_count = pcpu_count_ptr(ref);
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int cpu;
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BUG_ON(!pcpu_count);
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WARN_ON(!percpu_ref_is_zero(ref));
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atomic_long_set(&ref->count, 1 + PCPU_COUNT_BIAS);
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/*
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* Restore per-cpu operation. smp_store_release() is paired with
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* smp_read_barrier_depends() in __pcpu_ref_alive() and guarantees
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* that the zeroing is visible to all percpu accesses which can see
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* the following PCPU_REF_DEAD clearing.
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*/
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for_each_possible_cpu(cpu)
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*per_cpu_ptr(pcpu_count, cpu) = 0;
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smp_store_release(&ref->pcpu_count_ptr,
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ref->pcpu_count_ptr & ~PCPU_REF_DEAD);
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}
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EXPORT_SYMBOL_GPL(percpu_ref_reinit);
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/**
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* percpu_ref_exit - undo percpu_ref_init()
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* @ref: percpu_ref to exit
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@ -189,3 +154,38 @@ void percpu_ref_kill_and_confirm(struct percpu_ref *ref,
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call_rcu_sched(&ref->rcu, percpu_ref_kill_rcu);
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}
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EXPORT_SYMBOL_GPL(percpu_ref_kill_and_confirm);
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/**
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* percpu_ref_reinit - re-initialize a percpu refcount
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* @ref: perpcu_ref to re-initialize
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*
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* Re-initialize @ref so that it's in the same state as when it finished
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* percpu_ref_init(). @ref must have been initialized successfully, killed
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* and reached 0 but not exited.
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*
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* Note that percpu_ref_tryget[_live]() are safe to perform on @ref while
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* this function is in progress.
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*/
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void percpu_ref_reinit(struct percpu_ref *ref)
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{
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unsigned long __percpu *pcpu_count = pcpu_count_ptr(ref);
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int cpu;
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BUG_ON(!pcpu_count);
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WARN_ON(!percpu_ref_is_zero(ref));
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atomic_long_set(&ref->count, 1 + PCPU_COUNT_BIAS);
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/*
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* Restore per-cpu operation. smp_store_release() is paired with
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* smp_read_barrier_depends() in __pcpu_ref_alive() and guarantees
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* that the zeroing is visible to all percpu accesses which can see
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* the following PCPU_REF_DEAD clearing.
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*/
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for_each_possible_cpu(cpu)
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*per_cpu_ptr(pcpu_count, cpu) = 0;
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smp_store_release(&ref->pcpu_count_ptr,
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ref->pcpu_count_ptr & ~PCPU_REF_DEAD);
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}
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EXPORT_SYMBOL_GPL(percpu_ref_reinit);
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