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authorPekka Paalanen <pq@iki.fi>2009-08-17 01:18:38 +0300
committerDave Airlie <airlied@linux.ie>2009-08-19 16:07:00 +1000
commita0724fcf829e5afb66159ef68cb16a805ea11b42 (patch)
treef407795b0b6e38b8cbdf141de4135810c6a5ceab /include/drm
parent949ef70e2d1a5c12178875f513df34fc85d91a38 (diff)
downloadop-kernel-dev-a0724fcf829e5afb66159ef68cb16a805ea11b42.zip
op-kernel-dev-a0724fcf829e5afb66159ef68cb16a805ea11b42.tar.gz
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.h12
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 cd22ab4..99dc521 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;
}
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