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Subjectdrivers/vhost/vringh.c:567:18: sparse: sparse: restricted __virtio16 degrades to integer
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 80be5998ad6339e3e804a772723390cb50b96428
commit: d877322bc1adcab9850732275670409e8bcca4c4 openrisc: Fix issue with get_user for 64-bit values
date: 1 year ago
config: openrisc-randconfig-s032-20210916 (attached as .config)
compiler: or1k-linux-gcc (GCC) 11.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-dirty
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d877322bc1adcab9850732275670409e8bcca4c4
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout d877322bc1adcab9850732275670409e8bcca4c4
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=openrisc SHELL=/bin/bash drivers/vhost/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <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@redhat.com>
:::::: CC: Michael S. Tsirkin <mst@redhat.com>

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