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dma-buf: make dma_fence structure a bit smaller v2 

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
that they don't themselves hold a reference for.

This small change is actually making the structure 16% smaller.

v2: add the comment to the code as well.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/322916/
This commit is contained in:
Christian König 2019-08-07 12:31:48 +02:00
parent a84ddb8380
commit 0e2f733add
1 changed files with 8 additions and 2 deletions
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6
include/linux/dma-fence.h
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@ -65,8 +65,14 @@ struct dma_fence_cb;
struct dma_fence { struct dma_fence {
struct kref refcount; struct kref refcount;
const struct dma_fence_ops *ops; 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
* that they don't themselves hold a reference for.
*/
union {
struct rcu_head rcu; struct rcu_head rcu;
struct list_head cb_list; struct list_head cb_list;
};
spinlock_t *lock; spinlock_t *lock;
u64 context; u64 context;
u64 seqno; u64 seqno;