locking/atomic, kref: Add kref_read()
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>
diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c
index 1d6c335..33cd516 100644
--- a/drivers/gpu/drm/drm_gem_cma_helper.c
+++ b/drivers/gpu/drm/drm_gem_cma_helper.c
@@ -376,7 +376,7 @@
off = drm_vma_node_start(&obj->vma_node);
seq_printf(m, "%2d (%2d) %08llx %pad %p %zu",
- obj->name, obj->refcount.refcount.counter,
+ obj->name, kref_read(&obj->refcount),
off, &cma_obj->paddr, cma_obj->vaddr, obj->size);
seq_printf(m, "\n");
diff --git a/drivers/gpu/drm/drm_info.c b/drivers/gpu/drm/drm_info.c
index ffb2ab3..6b68e90 100644
--- a/drivers/gpu/drm/drm_info.c
+++ b/drivers/gpu/drm/drm_info.c
@@ -118,7 +118,7 @@
seq_printf(m, "%6d %8zd %7d %8d\n",
obj->name, obj->size,
obj->handle_count,
- atomic_read(&obj->refcount.refcount));
+ kref_read(&obj->refcount));
return 0;
}
diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c
index 9f17085..c6885a4 100644
--- a/drivers/gpu/drm/drm_mode_object.c
+++ b/drivers/gpu/drm/drm_mode_object.c
@@ -159,7 +159,7 @@
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 @@
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);
}
}
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
index 114dddb..aa6e35d 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -486,7 +486,7 @@
seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
- obj->name, obj->refcount.refcount.counter,
+ obj->name, kref_read(&obj->refcount),
off, etnaviv_obj->vaddr, obj->size);
rcu_read_lock();
diff --git a/drivers/gpu/drm/i915/i915_gem_object.h b/drivers/gpu/drm/i915/i915_gem_object.h
index 6a368de..ecfefb9 100644
--- a/drivers/gpu/drm/i915/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/i915_gem_object.h
@@ -256,7 +256,7 @@
static inline bool
i915_gem_object_is_dead(const struct drm_i915_gem_object *obj)
{
- return atomic_read(&obj->base.refcount.refcount) == 0;
+ return kref_read(&obj->base.refcount) == 0;
}
static inline bool
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index d8bc59c..4d24d93 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -640,7 +640,7 @@
seq_printf(m, "%08x: %c %2d (%2d) %08llx %p\t",
msm_obj->flags, is_active(msm_obj) ? 'A' : 'I',
- obj->name, obj->refcount.refcount.counter,
+ obj->name, kref_read(&obj->refcount),
off, msm_obj->vaddr);
for (id = 0; id < priv->num_aspaces; id++)
diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c
index a6126c9..88ee60d 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fence.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fence.c
@@ -527,7 +527,7 @@
* caller should have a reference on the fence,
* else fence could get freed here
*/
- WARN_ON(atomic_read(&fence->base.refcount.refcount) <= 1);
+ WARN_ON(kref_read(&fence->base.refcount) <= 1);
/*
* This needs uevents to work correctly, but dma_fence_add_callback relies on
diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c b/drivers/gpu/drm/omapdrm/omap_gem.c
index 4a90c69..74a9968 100644
--- a/drivers/gpu/drm/omapdrm/omap_gem.c
+++ b/drivers/gpu/drm/omapdrm/omap_gem.c
@@ -1033,7 +1033,7 @@
off = drm_vma_node_start(&obj->vma_node);
seq_printf(m, "%08x: %2d (%2d) %08llx %pad (%2d) %p %4d",
- omap_obj->flags, obj->name, obj->refcount.refcount.counter,
+ omap_obj->flags, obj->name, kref_read(&obj->refcount),
off, &omap_obj->paddr, omap_obj->paddr_cnt,
omap_obj->vaddr, omap_obj->roll);
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index d506361..30aefcc 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -140,8 +140,8 @@
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));
diff --git a/drivers/gpu/drm/ttm/ttm_object.c b/drivers/gpu/drm/ttm/ttm_object.c
index 4f5fa8d..fdb451e 100644
--- a/drivers/gpu/drm/ttm/ttm_object.c
+++ b/drivers/gpu/drm/ttm/ttm_object.c
@@ -304,7 +304,7 @@
* 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();