diff options
| author | Pekka Paalanen <pq@iki.fi> | 2009-08-17 02:18:38 +0400 |
|---|---|---|
| committer | Dave Airlie <airlied@linux.ie> | 2009-08-19 10:07:00 +0400 |
| commit | a0724fcf829e5afb66159ef68cb16a805ea11b42 (patch) | |
| tree | f407795b0b6e38b8cbdf141de4135810c6a5ceab /include/drm | |
| parent | 949ef70e2d1a5c12178875f513df34fc85d91a38 (diff) | |
| download | linux-a0724fcf829e5afb66159ef68cb16a805ea11b42.tar.xz | |
drm/ttm: optimize bo_kmap_type values
A micro-optimization on the function ttm_kmap_obj_virtual().
By defining the values of enum ttm_bo_kmap_obj::bo_kmap_type to have a
bit indicating iomem, size of the function ttm_kmap_obj_virtual() will be
reduced by 16 bytes on x86_64 (gcc 4.1.2).
ttm_kmap_obj_virtual() may be heavily used, when buffer objects are
accessed via wrappers, that work for both kinds of memory addresses:
iomem cookies and kernel virtual.
Signed-off-by: Pekka Paalanen <pq@iki.fi>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'include/drm')
| -rw-r--r-- | include/drm/ttm/ttm_bo_api.h | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h index cd22ab4b495c..99dc521aa1a9 100644 --- a/include/drm/ttm/ttm_bo_api.h +++ b/include/drm/ttm/ttm_bo_api.h @@ -245,14 +245,15 @@ struct ttm_buffer_object { * premapped region. */ +#define TTM_BO_MAP_IOMEM_MASK 0x80 struct ttm_bo_kmap_obj { void *virtual; struct page *page; enum { - ttm_bo_map_iomap, - ttm_bo_map_vmap, - ttm_bo_map_kmap, - ttm_bo_map_premapped, + ttm_bo_map_iomap = 1 | TTM_BO_MAP_IOMEM_MASK, + ttm_bo_map_vmap = 2, + ttm_bo_map_kmap = 3, + ttm_bo_map_premapped = 4 | TTM_BO_MAP_IOMEM_MASK, } bo_kmap_type; }; @@ -522,8 +523,7 @@ extern int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type); static inline void *ttm_kmap_obj_virtual(struct ttm_bo_kmap_obj *map, bool *is_iomem) { - *is_iomem = (map->bo_kmap_type == ttm_bo_map_iomap || - map->bo_kmap_type == ttm_bo_map_premapped); + *is_iomem = !!(map->bo_kmap_type & TTM_BO_MAP_IOMEM_MASK); return map->virtual; } |