The event_list array contains 8 small (4-byte) events that share
cachelines with each other. When CONFIG_DMA_API_DEBUG is enabled,
this can trigger warnings about overlapping DMA mappings within
the same cacheline.

The previous patch isolated event_list in its own cache lines
so the warnings are spurious.

Use virtqueue_add_inbuf_cache_clean() to indicate that the CPU does not
write into these fields, suppressing the warnings.

Reported-by: Cong Wang <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
---
 net/vmw_vsock/virtio_transport.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
index 76099f7dc040..f1589db5d190 100644
--- a/net/vmw_vsock/virtio_transport.c
+++ b/net/vmw_vsock/virtio_transport.c
@@ -393,7 +393,7 @@ static int virtio_vsock_event_fill_one(struct virtio_vsock 
*vsock,
 
        sg_init_one(&sg, event, sizeof(*event));
 
-       return virtqueue_add_inbuf(vq, &sg, 1, event, GFP_KERNEL);
+       return virtqueue_add_inbuf_cache_clean(vq, &sg, 1, event, GFP_KERNEL);
 }
 
 /* event_lock must be held */
-- 
MST


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