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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
Download patch file Download diff file Expand all files Collapse all files

2
net/bluetooth/6lowpan.c
View file

@ -920,7 +920,7 @@ static void chan_close_cb(struct l2cap_chan *chan)
BT_DBG("dev %p removing %speer %p", dev,
last ? "last " : "1 ", peer);
BT_DBG("chan %p orig refcnt %d", chan,
atomic_read(&chan->kref.refcount));
kref_read(&chan->kref));
l2cap_chan_put(chan);
break;

4
net/bluetooth/a2mp.c
View file

@ -810,7 +810,7 @@ static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn, bool locked)
/* AMP Manager functions */
struct amp_mgr *amp_mgr_get(struct amp_mgr *mgr)
{
BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
BT_DBG("mgr %p orig refcnt %d", mgr, kref_read(&mgr->kref));
kref_get(&mgr->kref);
@ -833,7 +833,7 @@ static void amp_mgr_destroy(struct kref *kref)
int amp_mgr_put(struct amp_mgr *mgr)
{
BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
BT_DBG("mgr %p orig refcnt %d", mgr, kref_read(&mgr->kref));
return kref_put(&mgr->kref, &amp_mgr_destroy);
}

4
net/bluetooth/amp.c
View file

@ -24,7 +24,7 @@
void amp_ctrl_get(struct amp_ctrl *ctrl)
{
BT_DBG("ctrl %p orig refcnt %d", ctrl,
atomic_read(&ctrl->kref.refcount));
kref_read(&ctrl->kref));
kref_get(&ctrl->kref);
}
@ -42,7 +42,7 @@ static void amp_ctrl_destroy(struct kref *kref)
int amp_ctrl_put(struct amp_ctrl *ctrl)
{
BT_DBG("ctrl %p orig refcnt %d", ctrl,
atomic_read(&ctrl->kref.refcount));
kref_read(&ctrl->kref));
return kref_put(&ctrl->kref, &amp_ctrl_destroy);
}

4
net/bluetooth/l2cap_core.c
View file

@ -481,14 +481,14 @@ static void l2cap_chan_destroy(struct kref *kref)
void l2cap_chan_hold(struct l2cap_chan *c)
{
BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
BT_DBG("chan %p orig refcnt %d", c, kref_read(&c->kref));
kref_get(&c->kref);
}
void l2cap_chan_put(struct l2cap_chan *c)
{
BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
BT_DBG("chan %p orig refcnt %d", c, kref_read(&c->kref));
kref_put(&c->kref, l2cap_chan_destroy);
}