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locking/atomic, kref: Add kref_read()

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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
parent 1e24edca05
commit 2c935bc572
56 changed files with 121 additions and 117 deletions
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drivers/block/drbd/drbd_req.c
+1 -1
View File
@@ -520,7 +520,7 @@ static void mod_rq_state(struct drbd_request *req, struct bio_and_error *m,
/* Completion does it's own kref_put. If we are going to
* kref_sub below, we need req to be still around then. */
int at_least = k_put + !!c_put;
int refcount = atomic_read(&req->kref.refcount);
int refcount = kref_read(&req->kref);
if (refcount < at_least)
drbd_err(device,
"mod_rq_state: Logic BUG: %x -> %x: refcount = %d, should be >= %d\n",