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dma-buf: Expand reservation_list to fill allocation
Since kmalloc() will round up the allocation to the next slab size or page, it will normally return a pointer to a memory block bigger than we asked for. We can query for the actual size of the allocated block using ksize() and expand our variable size reservation_list to take advantage of that extra space. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Christian König <christian.koenig@amd.com> Cc: Michel Dänzer <michel.daenzer@amd.com> Reviewed-by: Michel Dänzer <michel.daenzer@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190712080314.21018-1-chris@chris-wilson.co.uk
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1 changed files with 4 additions and 2 deletions
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@ -153,7 +153,9 @@ int reservation_object_reserve_shared(struct reservation_object *obj,
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RCU_INIT_POINTER(new->shared[j++], fence);
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RCU_INIT_POINTER(new->shared[j++], fence);
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}
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}
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new->shared_count = j;
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new->shared_count = j;
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new->shared_max = max;
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new->shared_max =
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(ksize(new) - offsetof(typeof(*new), shared)) /
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sizeof(*new->shared);
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preempt_disable();
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preempt_disable();
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write_seqcount_begin(&obj->seq);
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write_seqcount_begin(&obj->seq);
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@ -169,7 +171,7 @@ int reservation_object_reserve_shared(struct reservation_object *obj,
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return 0;
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return 0;
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/* Drop the references to the signaled fences */
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/* Drop the references to the signaled fences */
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for (i = k; i < new->shared_max; ++i) {
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for (i = k; i < max; ++i) {
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struct dma_fence *fence;
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struct dma_fence *fence;
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fence = rcu_dereference_protected(new->shared[i],
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fence = rcu_dereference_protected(new->shared[i],
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