percpu_ref: implement percpu_ref_is_dying()
Implement percpu_ref_is_dying() which tests whether the ref is dying or dead. This is useful to determine the current state when a percpu_ref is used as a cyclic on/off switch via kill and reinit. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Kent Overstreet <kmo@daterainc.com>hifive-unleashed-5.1
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6810e4a394
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4c907baf36
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@ -294,6 +294,20 @@ static inline void percpu_ref_put(struct percpu_ref *ref)
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percpu_ref_put_many(ref, 1);
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percpu_ref_put_many(ref, 1);
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}
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}
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/**
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* percpu_ref_is_dying - test whether a percpu refcount is dying or dead
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* @ref: percpu_ref to test
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*
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* Returns %true if @ref is dying or dead.
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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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* and the caller is responsible for synchronizing against state changes.
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*/
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static inline bool percpu_ref_is_dying(struct percpu_ref *ref)
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{
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return ref->percpu_count_ptr & __PERCPU_REF_DEAD;
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}
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/**
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/**
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* percpu_ref_is_zero - test whether a percpu refcount reached zero
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* percpu_ref_is_zero - test whether a percpu refcount reached zero
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* @ref: percpu_ref to test
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* @ref: percpu_ref to test
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