dma-fence: Shrink size of struct dma_fence

Rearrange the couple of 32-bit atomics hidden amongst the field of
pointers that unnecessarily caused the compiler to insert some padding,
shrinks the size of the base struct dma_fence from 80 to 72 bytes on
x86-64.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Christian König <christian.koenig@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190817144736.7826-3-chris@chris-wilson.co.uk

diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h
index 404aa74..2ce4d87 100644 (file)
--- a/include/linux/dma-fence.h
+++ b/include/linux/dma-fence.h
@@ -63,7 +63,7 @@ struct dma_fence_cb;
  * been completed, or never called at all.
  */
 struct dma_fence {
-       struct kref refcount;
+       spinlock_t *lock;
        const struct dma_fence_ops *ops;
        /* We clear the callback list on kref_put so that by the time we
         * release the fence it is unused. No one should be adding to the cb_list
@@ -73,11 +73,11 @@ struct dma_fence {
                struct rcu_head rcu;
                struct list_head cb_list;
        };
-       spinlock_t *lock;
        u64 context;
        u64 seqno;
-       unsigned long flags;
        ktime_t timestamp;
+       unsigned long flags;
+       struct kref refcount;
        int error;
 };