[kbuild-all] [chrome-os:chromeos-5.10 155/1031] net/ipv4/sysctl_net_ipv4.c:225:42: sparse: sparse: incorrect type in argument 3 (different address spaces)

tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.10 head: 73dbeef4571d1037d5e03374fad31195f60956cf commit: 5886769153480dd6dc42803b5717275daf0d5b03 [155/1031] CHROMIUM: net: Add per-netns dummy tcp_default_init_rwnd config: i386-randconfig-s001-20201217 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-184-g1b896707-dirty git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel git fetch --no-tags chrome-os chromeos-5.10 git checkout 5886769153480dd6dc42803b5717275daf0d5b03 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" net/ipv4/sysctl_net_ipv4.c:225:42: sparse: expected void * net/ipv4/sysctl_net_ipv4.c:225:42: sparse: got void [noderef] __user *buffer net/ipv4/sysctl_net_ipv4.c:1370:35: sparse: expected int ( [usertype] *proc_handler )( ... ) net/ipv4/sysctl_net_ipv4.c:1370:35: sparse: got int ( * )( ... ) vim +225 net/ipv4/sysctl_net_ipv4.c 219 220 /* The current kernel does not rely on this value so we do nothing here */ 221 static int proc_tcp_default_init_rwnd(struct ctl_table *ctl, int write, 222 void __user *buffer, 223 size_t *lenp, loff_t *ppos) 224 { 226 } 227 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org