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

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Date:   Tue, 30 Nov 2021 18:34:51 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Parav Pandit <parav@...dia.com>
Cc:     virtualization@...ts.linux-foundation.org, jasowang@...hat.com,
        edumazet@...gle.com, kbuild-all@...ts.01.org, lkp@...el.com,
        linux-kernel@...r.kernel.org, kbuild@...ts.01.org, elic@...dia.com,
        dan.carpenter@...cle.com
Subject: Re: [PATCH v1] vdpa: Consider device id larger than 31

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@...el.com>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> Signed-off-by: Parav Pandit <parav@...dia.com>
> Acked-by: Jason Wang <jasowang@...hat.com>
> ---
> 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