drm/ttm: use ffs in ttm_mem_type_from_place
A bit pointless to search for the first bit set manually.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index c2a30bd..fc6217d 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -57,14 +57,14 @@
static inline int ttm_mem_type_from_place(const struct ttm_place *place,
uint32_t *mem_type)
{
- int i;
+ int pos;
- for (i = 0; i <= TTM_PL_PRIV5; i++)
- if (place->flags & (1 << i)) {
- *mem_type = i;
- return 0;
- }
- return -EINVAL;
+ pos = ffs(place->flags & TTM_PL_MASK_MEM);
+ if (unlikely(!pos))
+ return -EINVAL;
+
+ *mem_type = pos - 1;
+ return 0;
}
static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)