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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/ttm/ttm_bo.c
View File

@@ -140,8 +140,8 @@ static void ttm_bo_release_list(struct kref *list_kref)
struct ttm_bo_device *bdev = bo->bdev;
size_t acc_size = bo->acc_size;
BUG_ON(atomic_read(&bo->list_kref.refcount));
BUG_ON(atomic_read(&bo->kref.refcount));
BUG_ON(kref_read(&bo->list_kref));
BUG_ON(kref_read(&bo->kref));
BUG_ON(atomic_read(&bo->cpu_writers));
BUG_ON(bo->mem.mm_node != NULL);
BUG_ON(!list_empty(&bo->lru));

2
drivers/gpu/drm/ttm/ttm_object.c
View File

@@ -304,7 +304,7 @@ bool ttm_ref_object_exists(struct ttm_object_file *tfile,
* Verify that the ref->obj pointer was actually valid!
*/
rmb();
if (unlikely(atomic_read(&ref->kref.refcount) == 0))
if (unlikely(kref_read(&ref->kref) == 0))
goto out_false;
rcu_read_unlock();