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Date:   Wed, 27 Jul 2022 10:58:05 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        virtualization@...ts.linux-foundation.org
Cc:     Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        Vadim Pasternak <vadimp@...dia.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Cornelia Huck <cohuck@...hat.com>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Eric Farman <farman@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        linux-um@...ts.infradead.org, netdev@...r.kernel.org,
        platform-driver-x86@...r.kernel.org,
        linux-remoteproc@...r.kernel.org, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org, bpf@...r.kernel.org,
        kangjie.xu@...ux.alibaba.com
Subject: Re: [PATCH v13 07/42] virtio_ring: split: stop __vring_new_virtqueue
 as export symbol


在 2022/7/26 15:21, Xuan Zhuo 写道:
> There is currently only one place to reference __vring_new_virtqueue()
> directly from the outside of virtio core. And here vring_new_virtqueue()
> can be used instead.
>
> Subsequent patches will modify __vring_new_virtqueue, so stop it as an
> export symbol for now.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> ---
>   drivers/virtio/virtio_ring.c | 25 ++++++++++++++++---------
>   include/linux/virtio_ring.h  | 10 ----------
>   tools/virtio/virtio_test.c   |  4 ++--
>   3 files changed, 18 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 0ad35eca0d39..4e54ed7ee7fb 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -204,6 +204,14 @@ struct vring_virtqueue {
>   #endif
>   };
>   
> +static struct virtqueue *__vring_new_virtqueue(unsigned int index,
> +					       struct vring vring,
> +					       struct virtio_device *vdev,
> +					       bool weak_barriers,
> +					       bool context,
> +					       bool (*notify)(struct virtqueue *),
> +					       void (*callback)(struct virtqueue *),
> +					       const char *name);
>   
>   /*
>    * Helpers.
> @@ -2197,14 +2205,14 @@ irqreturn_t vring_interrupt(int irq, void *_vq)
>   EXPORT_SYMBOL_GPL(vring_interrupt);
>   
>   /* Only available for split ring */
> -struct virtqueue *__vring_new_virtqueue(unsigned int index,
> -					struct vring vring,
> -					struct virtio_device *vdev,
> -					bool weak_barriers,
> -					bool context,
> -					bool (*notify)(struct virtqueue *),
> -					void (*callback)(struct virtqueue *),
> -					const char *name)
> +static struct virtqueue *__vring_new_virtqueue(unsigned int index,
> +					       struct vring vring,
> +					       struct virtio_device *vdev,
> +					       bool weak_barriers,
> +					       bool context,
> +					       bool (*notify)(struct virtqueue *),
> +					       void (*callback)(struct virtqueue *),
> +					       const char *name)
>   {
>   	struct vring_virtqueue *vq;
>   
> @@ -2272,7 +2280,6 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
>   	kfree(vq);
>   	return NULL;
>   }
> -EXPORT_SYMBOL_GPL(__vring_new_virtqueue);
>   
>   struct virtqueue *vring_create_virtqueue(
>   	unsigned int index,
> diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
> index b485b13fa50b..8b8af1a38991 100644
> --- a/include/linux/virtio_ring.h
> +++ b/include/linux/virtio_ring.h
> @@ -76,16 +76,6 @@ struct virtqueue *vring_create_virtqueue(unsigned int index,
>   					 void (*callback)(struct virtqueue *vq),
>   					 const char *name);
>   
> -/* Creates a virtqueue with a custom layout. */
> -struct virtqueue *__vring_new_virtqueue(unsigned int index,
> -					struct vring vring,
> -					struct virtio_device *vdev,
> -					bool weak_barriers,
> -					bool ctx,
> -					bool (*notify)(struct virtqueue *),
> -					void (*callback)(struct virtqueue *),
> -					const char *name);
> -
>   /*
>    * Creates a virtqueue with a standard layout but a caller-allocated
>    * ring.
> diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
> index 23f142af544a..86a410ddcedd 100644
> --- a/tools/virtio/virtio_test.c
> +++ b/tools/virtio/virtio_test.c
> @@ -102,8 +102,8 @@ static void vq_reset(struct vq_info *info, int num, struct virtio_device *vdev)
>   
>   	memset(info->ring, 0, vring_size(num, 4096));
>   	vring_init(&info->vring, num, info->ring, 4096);


Let's remove the duplicated vring_init() here.

With this removed:

Acked-by: Jason Wang <jasowang@...hat.com>


> -	info->vq = __vring_new_virtqueue(info->idx, info->vring, vdev, true,
> -					 false, vq_notify, vq_callback, "test");
> +	info->vq = vring_new_virtqueue(info->idx, num, 4096, vdev, true, false,
> +				       info->ring, vq_notify, vq_callback, "test");
>   	assert(info->vq);
>   	info->vq->priv = info;
>   }

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