On Mon, Jan 05, 2026 at 03:23:21AM -0500, Michael S. Tsirkin wrote:
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(-)
Acked-by: Stefano Garzarella <[email protected]>
diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
index bb94baadfd8b..ef983c36cb66 100644
--- a/net/vmw_vsock/virtio_transport.c
+++ b/net/vmw_vsock/virtio_transport.c
@@ -392,7 +392,7 @@ 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
