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dma-buf: further relax reservation_object_add_shared_fence
Other cores don't busy wait any more and we removed the last user of checking the seqno for changes. Drop updating the number for shared fences altogether. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/322379/?series=64837&rev=1
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@ -237,9 +237,6 @@ void reservation_object_add_shared_fence(struct reservation_object *obj,
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fobj = reservation_object_get_list(obj);
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count = fobj->shared_count;
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preempt_disable();
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write_seqcount_begin(&obj->seq);
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for (i = 0; i < count; ++i) {
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old = rcu_dereference_protected(fobj->shared[i],
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@ -257,9 +254,6 @@ replace:
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RCU_INIT_POINTER(fobj->shared[i], fence);
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/* pointer update must be visible before we extend the shared_count */
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smp_store_mb(fobj->shared_count, count);
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write_seqcount_end(&obj->seq);
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preempt_enable();
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dma_fence_put(old);
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}
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EXPORT_SYMBOL(reservation_object_add_shared_fence);
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@ -251,12 +251,7 @@ static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
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new->shared_max = old->shared_max;
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new->shared_count = k;
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/* Install the new fence list, seqcount provides the barriers */
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preempt_disable();
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write_seqcount_begin(&resv->seq);
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RCU_INIT_POINTER(resv->fence, new);
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write_seqcount_end(&resv->seq);
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preempt_enable();
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rcu_assign_pointer(resv->fence, new);
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/* Drop the references to the removed fences or move them to ef_list */
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for (i = j, k = 0; i < old->shared_count; ++i) {
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