drm: drop DRM_DEBUG_CODE

DRM_DEBUG_CODE is currently always set, so distributions enable it. The
only reason to keep support in code is if developers wanted to disable
debug support. Sounds unlikely.

All the DRM_DEBUG() printks are still guarded by a drm_debug read. So if
its cacheline is read once, they're discarded pretty fast.. There should
hardly be any performance penalty, it's even guarded by unlikely().

Signed-off-by: David Herrmann <[e-mail]>
Reviewed-by: Thierry Reding <[e-mail]>
Signed-off-by: Dave Airlie <[e-mail]>

drivers/gpu/drm/drm_debugfs.c

···
 	{"clients", drm_clients_info, 0},
 	{"bufs", drm_bufs_info, 0},
 	{"gem_names", drm_gem_name_info, DRIVER_GEM},
-#if DRM_DEBUG_CODE
 	{"vma", drm_vma_info, 0},
-#endif
 };
 #define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
 

drivers/gpu/drm/drm_vm.c

···
 	}
 }
 
-#if DRM_DEBUG_CODE
-
 int drm_vma_info(struct seq_file *m, void *data)
 {
 	struct drm_info_node *node = (struct drm_info_node *) m->private;
···
 	mutex_unlock(&dev->struct_mutex);
 	return 0;
 }
-
-#endif

drivers/gpu/drm/radeon/radeon.h

···
 /*
  * RING helpers.
  */
-#if DRM_DEBUG_CODE == 0
+
+/**
+ * radeon_ring_write - write a value to the ring
+ *
+ * @ring: radeon_ring structure holding ring information
+ * @v: dword (dw) value to write
+ *
+ * Write a value to the requested ring buffer (all asics).
+ */
 static inline void radeon_ring_write(struct radeon_ring *ring, uint32_t v)
 {
+	if (ring->count_dw <= 0)
+		DRM_ERROR("radeon: writing more dwords to the ring than expected!\n");
+
 	ring->ring[ring->wptr++] = v;
 	ring->wptr &= ring->ptr_mask;
 	ring->count_dw--;
 	ring->ring_free_dw--;
 }
-#else
-/* With debugging this is just too big to inline */
-void radeon_ring_write(struct radeon_ring *ring, uint32_t v);
-#endif
 
 /*
  * ASICs macro.

drivers/gpu/drm/radeon/radeon_ring.c

···
 static int radeon_debugfs_ring_init(struct radeon_device *rdev, struct radeon_ring *ring);
 
 /**
- * radeon_ring_write - write a value to the ring
- *
- * @ring: radeon_ring structure holding ring information
- * @v: dword (dw) value to write
- *
- * Write a value to the requested ring buffer (all asics).
- */
-void radeon_ring_write(struct radeon_ring *ring, uint32_t v)
-{
-#if DRM_DEBUG_CODE
-	if (ring->count_dw <= 0) {
-		DRM_ERROR("radeon: writing more dwords to the ring than expected!\n");
-	}
-#endif
-	ring->ring[ring->wptr++] = v;
-	ring->wptr &= ring->ptr_mask;
-	ring->count_dw--;
-	ring->ring_free_dw--;
-}
-
-/**
  * radeon_ring_supports_scratch_reg - check if the ring supports
  * writing to scratch registers
  *

include/drm/drmP.h

···
 /** \name Begin the DRM... */
 /*@{*/
 
-#define DRM_DEBUG_CODE 2	  /**< Include debugging code if > 1, then
-				     also include looping detection. */
-
 #define DRM_MAGIC_HASH_ORDER  4  /**< Size of key hash table. Must be power of 2. */
 
 /*@}*/
···
  * \param fmt printf() like format string.
  * \param arg arguments
  */
-#if DRM_DEBUG_CODE
 #define DRM_DEBUG(fmt, args...)						\
 	do {								\
 		if (unlikely(drm_debug & DRM_UT_CORE))			\
···
 		if (unlikely(drm_debug & DRM_UT_PRIME))			\
 			drm_ut_debug_printk(__func__, fmt, ##args);	\
 	} while (0)
-#else
-#define DRM_DEBUG_DRIVER(fmt, args...) do { } while (0)
-#define DRM_DEBUG_KMS(fmt, args...)	do { } while (0)
-#define DRM_DEBUG_PRIME(fmt, args...)	do { } while (0)
-#define DRM_DEBUG(fmt, arg...)		 do { } while (0)
-#endif
 
 /*@}*/
 
···
 void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv);
 void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf);
 
-#if DRM_DEBUG_CODE
 extern int drm_vma_info(struct seq_file *m, void *data);
-#endif
 
 				/* Scatter Gather Support (drm_scatter.h) */
 extern void drm_legacy_sg_cleanup(struct drm_device *dev);