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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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4
drivers/gpu/drm/drm_mode_object.c
View File

@@ -159,7 +159,7 @@ EXPORT_SYMBOL(drm_mode_object_find);
void drm_mode_object_unreference(struct drm_mode_object *obj)
{
if (obj->free_cb) {
DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, atomic_read(&obj->refcount.refcount));
DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
kref_put(&obj->refcount, obj->free_cb);
}
}
@@ -176,7 +176,7 @@ EXPORT_SYMBOL(drm_mode_object_unreference);
void drm_mode_object_reference(struct drm_mode_object *obj)
{
if (obj->free_cb) {
DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, atomic_read(&obj->refcount.refcount));
DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
kref_get(&obj->refcount);
}
}