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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

4
net/ceph/messenger.c
View file

@ -3425,7 +3425,7 @@ static void ceph_msg_release(struct kref *kref)
struct ceph_msg *ceph_msg_get(struct ceph_msg *msg)
{
dout("%s %p (was %d)\n", __func__, msg,
atomic_read(&msg->kref.refcount));
kref_read(&msg->kref));
kref_get(&msg->kref);
return msg;
}
@ -3434,7 +3434,7 @@ EXPORT_SYMBOL(ceph_msg_get);
void ceph_msg_put(struct ceph_msg *msg)
{
dout("%s %p (was %d)\n", __func__, msg,
atomic_read(&msg->kref.refcount));
kref_read(&msg->kref));
kref_put(&msg->kref, ceph_msg_release);
}
EXPORT_SYMBOL(ceph_msg_put);

10
net/ceph/osd_client.c
View file

@ -438,7 +438,7 @@ static void ceph_osdc_release_request(struct kref *kref)
void ceph_osdc_get_request(struct ceph_osd_request *req)
{
dout("%s %p (was %d)\n", __func__, req,
atomic_read(&req->r_kref.refcount));
kref_read(&req->r_kref));
kref_get(&req->r_kref);
}
EXPORT_SYMBOL(ceph_osdc_get_request);
@ -447,7 +447,7 @@ void ceph_osdc_put_request(struct ceph_osd_request *req)
{
if (req) {
dout("%s %p (was %d)\n", __func__, req,
atomic_read(&req->r_kref.refcount));
kref_read(&req->r_kref));
kref_put(&req->r_kref, ceph_osdc_release_request);
}
}
@ -487,11 +487,11 @@ static void request_reinit(struct ceph_osd_request *req)
struct ceph_msg *reply_msg = req->r_reply;
dout("%s req %p\n", __func__, req);
WARN_ON(atomic_read(&req->r_kref.refcount) != 1);
WARN_ON(kref_read(&req->r_kref) != 1);
request_release_checks(req);
WARN_ON(atomic_read(&request_msg->kref.refcount) != 1);
WARN_ON(atomic_read(&reply_msg->kref.refcount) != 1);
WARN_ON(kref_read(&request_msg->kref) != 1);
WARN_ON(kref_read(&reply_msg->kref) != 1);
target_destroy(&req->r_t);
request_init(req);