Am 04.05.2017 um 14:52 schrieb Nikola Pajkovsky:
> else branch is pointless if it's right at the end of function and use
> unlikely() on err path.
>
> Signed-off-by: Nikola Pajkovsky <npajkovsky at suse.cz>
Reviewed-by: Christian König <christian.koenig at amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu.h | 45 +++++++++++++++++++------------------
> 1 file changed, 23 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index c1b913541739..8ab250d4761a 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -1594,30 +1594,31 @@ static inline void amdgpu_ring_write_multiple(struct amdgpu_ring *ring, void *sr
> unsigned occupied, chunk1, chunk2;
> void *dst;
>
> - if (ring->count_dw < count_dw) {
> + if (unlikely(ring->count_dw < count_dw)) {
> DRM_ERROR("amdgpu: writing more dwords to the ring than expected!\n");
> - } else {
> - occupied = ring->wptr & ring->ptr_mask;
> - dst = (void *)&ring->ring[occupied];
> - chunk1 = ring->ptr_mask + 1 - occupied;
> - chunk1 = (chunk1 >= count_dw) ? count_dw: chunk1;
> - chunk2 = count_dw - chunk1;
> - chunk1 <<= 2;
> - chunk2 <<= 2;
> -
> - if (chunk1)
> - memcpy(dst, src, chunk1);
> -
> - if (chunk2) {
> - src += chunk1;
> - dst = (void *)ring->ring;
> - memcpy(dst, src, chunk2);
> - }
> -
> - ring->wptr += count_dw;
> - ring->wptr &= ring->ptr_mask;
> - ring->count_dw -= count_dw;
> + return;
> }
> +
> + occupied = ring->wptr & ring->ptr_mask;
> + dst = (void *)&ring->ring[occupied];
> + chunk1 = ring->ptr_mask + 1 - occupied;
> + chunk1 = (chunk1 >= count_dw) ? count_dw: chunk1;
> + chunk2 = count_dw - chunk1;
> + chunk1 <<= 2;
> + chunk2 <<= 2;
> +
> + if (chunk1)
> + memcpy(dst, src, chunk1);
> +
> + if (chunk2) {
> + src += chunk1;
> + dst = (void *)ring->ring;
> + memcpy(dst, src, chunk2);
> + }
> +
> + ring->wptr += count_dw;
> + ring->wptr &= ring->ptr_mask;
> + ring->count_dw -= count_dw;
> }
>
> static inline struct amdgpu_sdma_instance *
