[PATCH 3/6] dma-fence: Shrink size of struct dma_fence

Chris Wilson chris at chris-wilson.co.uk
Sat Aug 17 14:47:33 UTC 2019

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

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Christian König <christian.koenig at amd.com>
Reviewed-by: Christian König <christian.koenig at amd.com>
 include/linux/dma-fence.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h
index 404aa748eda6..2ce4d877d33e 100644
--- 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;

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