Re: [PATCH v7 09/15] vhost: add shadow used ring support for packed rings

[Tiwei Bie <tiwei.bie@intel.com>]

On Wed, Jul 04, 2018 at 11:54:32PM +0200, Maxime Coquelin wrote:
[...]
> +
> +static __rte_always_inline void
> +flush_shadow_used_ring_packed(struct virtio_net *dev,
> +			struct vhost_virtqueue *vq)
> +{
[...]
> +}
> +
> +static __rte_always_inline void
> +update_shadow_used_ring_packed(struct vhost_virtqueue *vq,
> +			 uint16_t desc_idx, uint16_t len, uint16_t count)
> +{
> +	uint16_t i = vq->shadow_used_idx++;
> +
> +	vq->shadow_used_packed[i].id  = desc_idx;
> +	vq->shadow_used_packed[i].len = len;
> +	vq->shadow_used_packed[i].count = count;
>  }
>  

I met below build errors in this patch when doing
per-patch build test with clang:

lib/librte_vhost/virtio_net.c:134:1: error: unused function 'flush_shadow_used_ring_packed'
      [-Werror,-Wunused-function]
flush_shadow_used_ring_packed(struct virtio_net *dev,
^
lib/librte_vhost/virtio_net.c:188:1: error: unused function 'update_shadow_used_ring_packed'
      [-Werror,-Wunused-function]
update_shadow_used_ring_packed(struct vhost_virtqueue *vq,
^

It's better to add __rte_unused in this patch,
and remove it when functions are used.

PS. I also saw similar errors with fill_vec_buf_packed()
    in patch 11/15.