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locking/atomic, kref: Add kref_read()

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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: Peter 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: Ingo Molnar <mingo@kernel.org>
[only add kref_read() to kref.h for stable backports - gregkh]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Zijlstra 2016-11-14 17:29:48 +01:00 committed by prashantpaddune
parent 565dfd77c0
commit edbca0f789
1 changed files with 5 additions and 0 deletions
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5
include/linux/kref.h
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@ -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.