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>
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@ -245,14 +245,15 @@ struct ttm_buffer_object {
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* premapped region.
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*/
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#define TTM_BO_MAP_IOMEM_MASK 0x80
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struct ttm_bo_kmap_obj {
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void *virtual;
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struct page *page;
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enum {
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ttm_bo_map_iomap,
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ttm_bo_map_vmap,
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ttm_bo_map_kmap,
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ttm_bo_map_premapped,
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ttm_bo_map_iomap = 1 | TTM_BO_MAP_IOMEM_MASK,
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ttm_bo_map_vmap = 2,
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ttm_bo_map_kmap = 3,
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ttm_bo_map_premapped = 4 | TTM_BO_MAP_IOMEM_MASK,
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} bo_kmap_type;
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};
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@ -522,8 +523,7 @@ extern int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type);
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static inline void *ttm_kmap_obj_virtual(struct ttm_bo_kmap_obj *map,
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bool *is_iomem)
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{
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*is_iomem = (map->bo_kmap_type == ttm_bo_map_iomap ||
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map->bo_kmap_type == ttm_bo_map_premapped);
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*is_iomem = !!(map->bo_kmap_type & TTM_BO_MAP_IOMEM_MASK);
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return map->virtual;
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}
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