drm/ttm: add ttm_bo_init_reserved
This variant of ttm_bo_init returns the validated buffer object with the reservation lock held when resv == NULL. This is convenient for callers that want to use the BO immediately, e.g. for initializing its contents. Signed-off-by: Nicolai Hähnle <nicolai.haehnle@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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