netdev - Re: [PATCH 6/6] vDPA: fix 'cast to restricted le16' warnings in vdpa_dev_net_config

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Date:   Tue, 7 Jun 2022 14:41:19 +0800
From:   "Zhu, Lingshan" <lingshan.zhu@...el.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     mst <mst@...hat.com>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 6/6] vDPA: fix 'cast to restricted le16' warnings in
 vdpa_dev_net_config_fill()



On 6/7/2022 2:15 PM, Jason Wang wrote:
> On Mon, Jun 6, 2022 at 4:22 PM Zhu, Lingshan <lingshan.zhu@...el.com> wrote:
>>
>>
>> On 6/2/2022 3:40 PM, Jason Wang wrote:
>>> On Thu, Jun 2, 2022 at 10:48 AM Zhu Lingshan <lingshan.zhu@...el.com> wrote:
>>>> This commit fixes spars warnings: cast to restricted __le16
>>>> in function vdpa_dev_net_config_fill()
>>>>
>>>> Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
>>>> ---
>>>>    drivers/vdpa/vdpa.c | 4 ++--
>>>>    1 file changed, 2 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
>>>> index 50a11ece603e..2719ce9962fc 100644
>>>> --- a/drivers/vdpa/vdpa.c
>>>> +++ b/drivers/vdpa/vdpa.c
>>>> @@ -837,11 +837,11 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms
>>>>                       config.mac))
>>>>                   return -EMSGSIZE;
>>>>
>>>> -       val_u16 = le16_to_cpu(config.status);
>>>> +       val_u16 = le16_to_cpu((__force __le16)config.status);
>>> Can we use virtio accessors like virtio16_to_cpu()?
>> I will work out a vdpa16_to_cpu()
> I meant __virtio16_to_cpu(true, xxx) actually here.
sure, this can work!
>
> Thanks
>
>> Thanks,
>> Zhu Lingshan
>>> Thanks
>>>
>>>>           if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_STATUS, val_u16))
>>>>                   return -EMSGSIZE;
>>>>
>>>> -       val_u16 = le16_to_cpu(config.mtu);
>>>> +       val_u16 = le16_to_cpu((__force __le16)config.mtu);
>>>>           if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MTU, val_u16))
>>>>                   return -EMSGSIZE;
>>>>
>>>> --
>>>> 2.31.1
>>>>