Commit 408f1793 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Kelsey Skunberg

locking/atomic, kref: Add kref_read()

BugLink: https://bugs.launchpad.net/bugs/1873852

commit 2c935bc5 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>
Signed-off-by: default avatarKleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: default avatarKelsey Skunberg <kelsey.skunberg@canonical.com>
parent 49e7d501
...@@ -33,6 +33,11 @@ static inline void kref_init(struct kref *kref) ...@@ -33,6 +33,11 @@ static inline void kref_init(struct kref *kref)
atomic_set(&kref->refcount, 1); 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_get - increment refcount for object.
* @kref: object. * @kref: object.
......
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