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Commit 4c907baf authored by Tejun Heo's avatar Tejun Heo
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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: default avatarTejun Heo <tj@kernel.org>
Cc: Kent Overstreet <kmo@daterainc.com>
parent 6810e4a3

include/linux/percpu-refcount.h

+14 −0
Original line number Diff line number Diff line
@@ -294,6 +294,20 @@ static inline void percpu_ref_put(struct percpu_ref *ref) 
	percpu_ref_put_many(ref, 1);

}



/**

 * percpu_ref_is_dying - test whether a percpu refcount is dying or dead

 * @ref: percpu_ref to test

 *

 * Returns %true if @ref is dying or dead.

 *

 * This function is safe to call as long as @ref is between init and exit

 * and the caller is responsible for synchronizing against state changes.

 */

static inline bool percpu_ref_is_dying(struct percpu_ref *ref)

{

	return ref->percpu_count_ptr & __PERCPU_REF_DEAD;

}



/**

 * percpu_ref_is_zero - test whether a percpu refcount reached zero

 * @ref: percpu_ref to test