Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit ea9df3c8 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Greg Kroah-Hartman
Browse files

locking/atomic, kref: Add kref_read() 



commit 2c935bc57221cc2edc787c72ea0e2d30cdcd3d5e upstream.

Since we need to change the implementation, stop exposing internals.

Provide kref_read() to read the current reference count; typically
used for debug messages.

Kills two anti-patterns:

	atomic_read(&kref->refcount)
	kref->refcount.counter

Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
[only add kref_read() to kref.h for stable backports - gregkh]
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6bc9bf78

include/linux/kref.h

+5 −0
Original line number Diff line number Diff line
@@ -33,6 +33,11 @@ static inline void kref_init(struct kref *kref) 
	atomic_set(&kref->refcount, 1);

}



static inline int kref_read(const struct kref *kref)

{

	return atomic_read(&kref->refcount);

}



/**

 * kref_get - increment refcount for object.

 * @kref: object.