linux-kernel - Re: [PATCH v3] virtio_pmem: fix sparse warning

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Message-ID: <20190712101021-mutt-send-email-mst@kernel.org>
Date:   Fri, 12 Jul 2019 10:10:51 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Pankaj Gupta <pagupta@...hat.com>
Cc:     dan.j.williams@...el.com, lcapitulino@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-nvdimm@...ts.01.org, cohuck@...hat.com,
        yuval.shaia@...cle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] virtio_pmem: fix sparse warning

On Fri, Jul 12, 2019 at 10:46:10AM +0530, Pankaj Gupta wrote:
> This patch fixes below sparse warning related to __virtio
> type in virtio pmem driver. This is reported by Intel test
> bot on linux-next tree.
> 
> nd_virtio.c:56:28: warning: incorrect type in assignment
>                                 (different base types)
> nd_virtio.c:56:28:    expected unsigned int [unsigned] [usertype] type
> nd_virtio.c:56:28:    got restricted __virtio32
> nd_virtio.c:93:59: warning: incorrect type in argument 2
>                                 (different base types)
> nd_virtio.c:93:59:    expected restricted __virtio32 [usertype] val
> nd_virtio.c:93:59:    got unsigned int [unsigned] [usertype] ret
> 
> Reported-by: kbuild test robot <lkp@...el.com>
> Signed-off-by: Pankaj Gupta <pagupta@...hat.com>

Acked-by: Michael S. Tsirkin <mst@...hat.com>

Pls merge - I assume nvdimm tree?

> ---
> This fixes a warning, so submitting it as a separate
> patch on top of virtio pmem series.
> 
> v2-> v3
>  Use __le for req/resp fields - Michael
> 
>  drivers/nvdimm/nd_virtio.c       | 4 ++--
>  include/uapi/linux/virtio_pmem.h | 4 ++--
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/nvdimm/nd_virtio.c b/drivers/nvdimm/nd_virtio.c
> index 8645275c08c2..10351d5b49fa 100644
> --- a/drivers/nvdimm/nd_virtio.c
> +++ b/drivers/nvdimm/nd_virtio.c
> @@ -53,7 +53,7 @@ static int virtio_pmem_flush(struct nd_region *nd_region)
>  	init_waitqueue_head(&req_data->host_acked);
>  	init_waitqueue_head(&req_data->wq_buf);
>  	INIT_LIST_HEAD(&req_data->list);
> -	req_data->req.type = cpu_to_virtio32(vdev, VIRTIO_PMEM_REQ_TYPE_FLUSH);
> +	req_data->req.type = cpu_to_le32(VIRTIO_PMEM_REQ_TYPE_FLUSH);
>  	sg_init_one(&sg, &req_data->req, sizeof(req_data->req));
>  	sgs[0] = &sg;
>  	sg_init_one(&ret, &req_data->resp.ret, sizeof(req_data->resp));
> @@ -90,7 +90,7 @@ static int virtio_pmem_flush(struct nd_region *nd_region)
>  	} else {
>  		/* A host repsonse results in "host_ack" getting called */
>  		wait_event(req_data->host_acked, req_data->done);
> -		err = virtio32_to_cpu(vdev, req_data->resp.ret);
> +		err = le32_to_cpu(req_data->resp.ret);
>  	}
>  
>  	kfree(req_data);
> diff --git a/include/uapi/linux/virtio_pmem.h b/include/uapi/linux/virtio_pmem.h
> index efcd72f2d20d..9a63ed6d062f 100644
> --- a/include/uapi/linux/virtio_pmem.h
> +++ b/include/uapi/linux/virtio_pmem.h
> @@ -23,12 +23,12 @@ struct virtio_pmem_config {
>  
>  struct virtio_pmem_resp {
>  	/* Host return status corresponding to flush request */
> -	__u32 ret;
> +	__le32 ret;
>  };
>  
>  struct virtio_pmem_req {
>  	/* command type */
> -	__u32 type;
> +	__le32 type;
>  };
>  
>  #endif
> -- 
> 2.14.5