linux-kernel - drivers/vhost/vringh.c:567:18: sparse: sparse: cast to restricted _

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Date:   Mon, 4 Dec 2023 08:14:37 +0800
From:   kernel test robot <lkp@...el.com>
To:     Stafford Horne <shorne@...il.com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>
Subject: drivers/vhost/vringh.c:567:18: sparse: sparse: cast to restricted
 __virtio16

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   33cc938e65a98f1d29d0a18403dbbee050dcad9a
commit: d877322bc1adcab9850732275670409e8bcca4c4 openrisc: Fix issue with get_user for 64-bit values
date:   3 years, 3 months ago
config: openrisc-randconfig-r131-20231102 (https://download.01.org/0day-ci/archive/20231204/202312040724.O4m0RXc4-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231204/202312040724.O4m0RXc4-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202312040724.O4m0RXc4-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/vhost/vringh.c:567:18: sparse: sparse: cast to restricted __virtio16
>> drivers/vhost/vringh.c:567:18: sparse: sparse: cast to restricted __virtio16
>> drivers/vhost/vringh.c:567:18: sparse: sparse: cast to restricted __virtio16
>> drivers/vhost/vringh.c:567:18: sparse: sparse: restricted __virtio16 degrades to integer
>> drivers/vhost/vringh.c:567:18: sparse: sparse: restricted __virtio16 degrades to integer
>> drivers/vhost/vringh.c:567:18: sparse: sparse: cast to restricted __virtio16
>> drivers/vhost/vringh.c:567:18: sparse: sparse: cast to restricted __virtio16

vim +567 drivers/vhost/vringh.c

f87d0fbb579818 Rusty Russell      2013-03-20  562  
f87d0fbb579818 Rusty Russell      2013-03-20  563  /* Userspace access helpers: in this case, addresses are really userspace. */
b9f7ac8c72894c Michael S. Tsirkin 2014-12-12  564  static inline int getu16_user(const struct vringh *vrh, u16 *val, const __virtio16 *p)
f87d0fbb579818 Rusty Russell      2013-03-20  565  {
b9f7ac8c72894c Michael S. Tsirkin 2014-12-12  566  	__virtio16 v = 0;
b9f7ac8c72894c Michael S. Tsirkin 2014-12-12 @567  	int rc = get_user(v, (__force __virtio16 __user *)p);
b9f7ac8c72894c Michael S. Tsirkin 2014-12-12  568  	*val = vringh16_to_cpu(vrh, v);
b9f7ac8c72894c Michael S. Tsirkin 2014-12-12  569  	return rc;
f87d0fbb579818 Rusty Russell      2013-03-20  570  }
f87d0fbb579818 Rusty Russell      2013-03-20  571  

:::::: The code at line 567 was first introduced by commit
:::::: b9f7ac8c72894c19bf258a54ecaa708df4ffbe80 vringh: update for virtio 1.0 APIs

:::::: TO: Michael S. Tsirkin <mst@...hat.com>
:::::: CC: Michael S. Tsirkin <mst@...hat.com>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki