[PATCH 1/4] drm/sched: optimize drm_sched_job_add_dependency a bit

[Christian König]

Since we already iterated over the xarray we know at which index the new
entry should be stored. So instead of using xa_alloc use xa_store and
write into the index directly.

Signed-off-by: Christian König <christian.koe...@amd.com>
---
 drivers/gpu/drm/scheduler/sched_main.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/scheduler/sched_main.c 
b/drivers/gpu/drm/scheduler/sched_main.c
index f7118497e47a..d2d64bf17c96 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -871,10 +871,8 @@ EXPORT_SYMBOL(drm_sched_job_arm);
 int drm_sched_job_add_dependency(struct drm_sched_job *job,
                                 struct dma_fence *fence)
 {
+       unsigned long index = -1;
        struct dma_fence *entry;
-       unsigned long index;
-       u32 id = 0;
-       int ret;
 
        if (!fence)
                return 0;
@@ -896,11 +894,13 @@ int drm_sched_job_add_dependency(struct drm_sched_job 
*job,
                return 0;
        }
 
-       ret = xa_alloc(&job->dependencies, &id, fence, xa_limit_32b, 
GFP_KERNEL);
-       if (ret != 0)
+       entry = xa_store(&job->dependencies, index + 1, fence, GFP_KERNEL);
+       if (xa_is_err(entry))
                dma_fence_put(fence);
+       else
+               WARN_ON(entry);
 
-       return ret;
+       return xa_err(entry);
 }
 EXPORT_SYMBOL(drm_sched_job_add_dependency);
 
-- 
2.34.1