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
