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locking/atomic, kref: Add kref_read()

Browse source 
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>
This commit is contained in:
Peter Zijlstra 2016-11-14 17:29:48 +01:00 • committed by Ingo Molnar
commit 2c935bc572
56 changed files with 121 additions and 117 deletions
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2
drivers/misc/genwqe/card_dev.c
View file

@ -1396,7 +1396,7 @@ int genwqe_device_remove(struct genwqe_dev *cd)
* application which will decrease this reference from
* 1/unused to 0/illegal and not from 2/used 1/empty.
*/
rc = atomic_read(&cd->cdev_genwqe.kobj.kref.refcount);
rc = kref_read(&cd->cdev_genwqe.kobj.kref);
if (rc != 1) {
dev_err(&pci_dev->dev,
"[%s] err: cdev_genwqe...refcount=%d\n", __func__, rc);

2
drivers/misc/mei/debugfs.c
View file

@ -67,7 +67,7 @@ static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
me_cl->props.max_number_of_connections,
me_cl->props.max_msg_length,
me_cl->props.single_recv_buf,
atomic_read(&me_cl->refcnt.refcount));
kref_read(&me_cl->refcnt));
mei_me_cl_put(me_cl);
}