Re: [PATCH v1] vdpa: Consider device id larger than 31

[Michael S. Tsirkin]

On Tue, Nov 30, 2021 at 06:29:49AM +0200, Parav Pandit wrote:
> virtio device id value can be more than 31. Hence, use BIT_ULL in
> assignment.
> 
> Fixes: 33b347503f01 ("vdpa: Define vdpa mgmt device, ops and a netlink interface")
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> Signed-off-by: Parav Pandit <parav@xxxxxxxxxx>
> Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
> ---
> changelog:
> v0->v1:
>  - supporting device id up to 63
> ---
>  drivers/vdpa/vdpa.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> index 7332a74a4b00..09bbe53c3ac4 100644
> --- a/drivers/vdpa/vdpa.c
> +++ b/drivers/vdpa/vdpa.c
> @@ -404,7 +404,8 @@ static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *m
>  		goto msg_err;
>  
>  	while (mdev->id_table[i].device) {
> -		supported_classes |= BIT(mdev->id_table[i].device);
> +		if (mdev->id_table[i].device <= 63)
> +			supported_classes |= BIT_ULL(mdev->id_table[i].device);
>  		i++;
>  	}


Not for this release, but a for loop will be cleaner here.

> -- 
> 2.26.2