linux-kernel - Re: drivers/vdpa/vdpa.c:296 vdpa_mgmtdev_fill() warn: should '(((1))) << (mdev->id

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Date:   Thu, 25 Nov 2021 11:15:35 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     kbuild@...ts.01.org, Parav Pandit <parav@...dia.com>,
        lkp@...el.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Eli Cohen <elic@...dia.com>,
        Jason Wang <jasowang@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: drivers/vdpa/vdpa.c:296 vdpa_mgmtdev_fill() warn: should
 '(((1))) << (mdev->id_table[i]->device)' be a 64 bit type?

On Thu, Nov 25, 2021 at 10:03:28AM +0300, Dan Carpenter wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   5d9f4cf36721aba199975a9be7863a3ff5cd4b59
> commit: 33b347503f014ebf76257327cbc7001c6b721956 vdpa: Define vdpa mgmt device, ops and a netlink interface
> config: i386-randconfig-m021-20211118 (https://download.01.org/0day-ci/archive/20211125/202111250317.VUsGtdox-lkp@intel.com/config)
> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> smatch warnings:
> drivers/vdpa/vdpa.c:296 vdpa_mgmtdev_fill() warn: should '(((1))) << (mdev->id_table[i]->device)' be a 64 bit type?
> 
> vim +296 drivers/vdpa/vdpa.c
> 
> 33b347503f014eb Parav Pandit 2021-01-05  280  static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *msg,
> 33b347503f014eb Parav Pandit 2021-01-05  281  			     u32 portid, u32 seq, int flags)
> 33b347503f014eb Parav Pandit 2021-01-05  282  {
> 33b347503f014eb Parav Pandit 2021-01-05  283  	u64 supported_classes = 0;
>                                                 ^^^^^^^^^^^^^^^^^^^^^
> This is a u64
> 
> 33b347503f014eb Parav Pandit 2021-01-05  284  	void *hdr;
> 33b347503f014eb Parav Pandit 2021-01-05  285  	int i = 0;
> 33b347503f014eb Parav Pandit 2021-01-05  286  	int err;
> 33b347503f014eb Parav Pandit 2021-01-05  287  
> 33b347503f014eb Parav Pandit 2021-01-05  288  	hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags, VDPA_CMD_MGMTDEV_NEW);
> 33b347503f014eb Parav Pandit 2021-01-05  289  	if (!hdr)
> 33b347503f014eb Parav Pandit 2021-01-05  290  		return -EMSGSIZE;
> 33b347503f014eb Parav Pandit 2021-01-05  291  	err = vdpa_nl_mgmtdev_handle_fill(msg, mdev);
> 33b347503f014eb Parav Pandit 2021-01-05  292  	if (err)
> 33b347503f014eb Parav Pandit 2021-01-05  293  		goto msg_err;
> 33b347503f014eb Parav Pandit 2021-01-05  294  
> 33b347503f014eb Parav Pandit 2021-01-05  295  	while (mdev->id_table[i].device) {
> 33b347503f014eb Parav Pandit 2021-01-05 @296  		supported_classes |= BIT(mdev->id_table[i].device);
> 
> Which suggests that this should be BIT_ULL().
> 
> 33b347503f014eb Parav Pandit 2021-01-05  297  		i++;
> 33b347503f014eb Parav Pandit 2021-01-05  298  	}
> 33b347503f014eb Parav Pandit 2021-01-05  299  
> 33b347503f014eb Parav Pandit 2021-01-05  300  	if (nla_put_u64_64bit(msg, VDPA_ATTR_MGMTDEV_SUPPORTED_CLASSES,
> 33b347503f014eb Parav Pandit 2021-01-05  301  			      supported_classes, VDPA_ATTR_UNSPEC)) {
> 33b347503f014eb Parav Pandit 2021-01-05  302  		err = -EMSGSIZE;
> 33b347503f014eb Parav Pandit 2021-01-05  303  		goto msg_err;
> 33b347503f014eb Parav Pandit 2021-01-05  304  	}
> 33b347503f014eb Parav Pandit 2021-01-05  305  
> 33b347503f014eb Parav Pandit 2021-01-05  306  	genlmsg_end(msg, hdr);
> 33b347503f014eb Parav Pandit 2021-01-05  307  	return 0;
> 33b347503f014eb Parav Pandit 2021-01-05  308  
> 33b347503f014eb Parav Pandit 2021-01-05  309  msg_err:
> 33b347503f014eb Parav Pandit 2021-01-05  310  	genlmsg_cancel(msg, hdr);
> 33b347503f014eb Parav Pandit 2021-01-05  311  	return err;
> 33b347503f014eb Parav Pandit 2021-01-05  312  }


Parav? Any patches for this one?

> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org