tree: https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git 20211116-sysctl-cleanups-v4 head: 5347239461f25fc50aa761923245b9ec4a4aafec commit: b8c066c91c9a2a236ca09ea16d967448bdbe7bb0 [21/35] printk: move printk sysctl to printk/sysctl.c config: m68k-randconfig-s031-20211117 (attached as .config) compiler: m68k-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/mcgrof/linux-next.git/com... git remote add mcgrof-next https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git git fetch --no-tags mcgrof-next 20211116-sysctl-cleanups-v4 git checkout b8c066c91c9a2a236ca09ea16d967448bdbe7bb0 # 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__' ARCH=m68k 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 >>) kernel/printk/sysctl.c:20:51: sparse: expected void * kernel/printk/sysctl.c:20:51: sparse: got void [noderef] __user *buffer kernel/printk/sysctl.c:66:35: sparse: expected int ( [usertype] *proc_handler )( ... ) kernel/printk/sysctl.c:66:35: sparse: got int ( * )( ... ) kernel/printk/sysctl.c:75:35: sparse: sparse: incorrect type in initializer (incompatible argument 3 (different address spaces)) @@ expected int ( [usertype] *proc_handler )( ... ) @@ got int ( * )( ... ) @@ kernel/printk/sysctl.c:75:35: sparse: expected int ( [usertype] *proc_handler )( ... ) kernel/printk/sysctl.c:75:35: sparse: got int ( * )( ... ) vim +20 kernel/printk/sysctl.c 13 14 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 15 void __user *buffer, size_t *lenp, loff_t *ppos) 16 { 17 if (write && !capable(CAP_SYS_ADMIN)) 18 return -EPERM; 19 21 } 22 23 static struct ctl_table printk_sysctls[] = { 24 { 25 .procname = "printk", 26 .data = &console_loglevel, 27 .maxlen = 4*sizeof(int), 28 .mode = 0644, 29 .proc_handler = proc_dointvec, 30 }, 31 { 32 .procname = "printk_ratelimit", 33 .data = &printk_ratelimit_state.interval, 34 .maxlen = sizeof(int), 35 .mode = 0644, 36 .proc_handler = proc_dointvec_jiffies, 37 }, 38 { 39 .procname = "printk_ratelimit_burst", 40 .data = &printk_ratelimit_state.burst, 41 .maxlen = sizeof(int), 42 .mode = 0644, 43 .proc_handler = proc_dointvec, 44 }, 45 { 46 .procname = "printk_delay", 47 .data = &printk_delay_msec, 48 .maxlen = sizeof(int), 49 .mode = 0644, 50 .proc_handler = proc_dointvec_minmax, 51 .extra1 = SYSCTL_ZERO, 52 .extra2 = (void *)&ten_thousand, 53 }, 54 { 55 .procname = "printk_devkmsg", 56 .data = devkmsg_log_str, 57 .maxlen = DEVKMSG_STR_MAX_SIZE, 58 .mode = 0644, 59 .proc_handler = devkmsg_sysctl_set_loglvl, 60 }, 61 { 62 .procname = "dmesg_restrict", 63 .data = &dmesg_restrict, 64 .maxlen = sizeof(int), 65 .mode = 0644, 67 .extra1 = SYSCTL_ZERO, 68 .extra2 = SYSCTL_ONE, 69 }, 70 { 71 .procname = "kptr_restrict", 72 .data = &kptr_restrict, 73 .maxlen = sizeof(int), 74 .mode = 0644, 75 .proc_handler = proc_dointvec_minmax_sysadmin, 76 .extra1 = SYSCTL_ZERO, 77 .extra2 = SYSCTL_TWO, 78 }, 79 {} 80 }; 81 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org