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@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
---
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 *
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