pcpu_ref: add percpu_ref_tryget_many()
Add percpu_ref_tryget_many(), which works the same way as percpu_ref_tryget(), but grabs specified number of refs. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Acked-by: Tejun Heo <tj@kernel.org> Acked-by: Dennis Zhou <dennis@kernel.org> Cc: Christoph Lameter <cl@linux.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -209,6 +209,36 @@ static inline void percpu_ref_get(struct percpu_ref *ref)
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percpu_ref_get_many(ref, 1);
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}
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/**
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* percpu_ref_tryget_many - try to increment a percpu refcount
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* @ref: percpu_ref to try-get
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* @nr: number of references to get
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*
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* Increment a percpu refcount by @nr unless its count already reached zero.
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* Returns %true on success; %false on failure.
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*
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* This function is safe to call as long as @ref is between init and exit.
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*/
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static inline bool percpu_ref_tryget_many(struct percpu_ref *ref,
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unsigned long nr)
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{
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unsigned long __percpu *percpu_count;
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bool ret;
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rcu_read_lock();
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if (__ref_is_percpu(ref, &percpu_count)) {
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this_cpu_add(*percpu_count, nr);
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ret = true;
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} else {
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ret = atomic_long_add_unless(&ref->count, nr, 0);
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}
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rcu_read_unlock();
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return ret;
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}
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/**
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* percpu_ref_tryget - try to increment a percpu refcount
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* @ref: percpu_ref to try-get
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@ -220,21 +250,7 @@ static inline void percpu_ref_get(struct percpu_ref *ref)
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*/
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static inline bool percpu_ref_tryget(struct percpu_ref *ref)
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{
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unsigned long __percpu *percpu_count;
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bool ret;
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rcu_read_lock();
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if (__ref_is_percpu(ref, &percpu_count)) {
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this_cpu_inc(*percpu_count);
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ret = true;
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} else {
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ret = atomic_long_inc_not_zero(&ref->count);
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}
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rcu_read_unlock();
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return ret;
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return percpu_ref_tryget_many(ref, 1);
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}
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/**
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