[mcgrof-next:20211117-sysctl-cleanups-all-set-04 22/36] kernel/printk/printk.c:3205:2: error: implicit declaration of function 'printk_sysctl_init'

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git 20211117-sysctl-cleanups-all-set-04
head:   3559bb8939dd93c96215ab179d868c5fdc167335
commit: 99f50ec2e9ced923150fa9f7d6d9a5f767cba59c [22/36] printk: move printk sysctl to printk/sysctl.c
config: arm-randconfig-r012-20211118 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c46becf500df2a7fb4b4fce16178a036c344315a)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git/commit/?id=99f50ec2e9ced923150fa9f7d6d9a5f767cba59c
        git remote add mcgrof-next https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git
        git fetch --no-tags mcgrof-next 20211117-sysctl-cleanups-all-set-04
        git checkout 99f50ec2e9ced923150fa9f7d6d9a5f767cba59c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All error/warnings (new ones prefixed by >>):

   kernel/printk/printk.c:175:5: warning: no previous prototype for function 'devkmsg_sysctl_set_loglvl' [-Wmissing-prototypes]
   int devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write,
       ^
   kernel/printk/printk.c:175:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write,
   ^
   static 
>> kernel/printk/printk.c:3205:2: error: implicit declaration of function 'printk_sysctl_init' [-Werror,-Wimplicit-function-declaration]
           printk_sysctl_init();
           ^
   kernel/printk/printk.c:3205:2: note: did you mean 'printk_late_init'?
   kernel/printk/printk.c:3174:19: note: 'printk_late_init' declared here
   static int __init printk_late_init(void)
                     ^
   1 warning and 1 error generated.
--
>> kernel/printk/sysctl.c:47:13: error: use of undeclared identifier 'printk_delay_msec'
                   .data           = &printk_delay_msec,
                                      ^
>> kernel/printk/sysctl.c:59:19: error: use of undeclared identifier 'devkmsg_sysctl_set_loglvl'
                   .proc_handler   = devkmsg_sysctl_set_loglvl,
                                     ^
>> kernel/printk/sysctl.c:63:13: error: use of undeclared identifier 'dmesg_restrict'; did you mean 'kptr_restrict'?
                   .data           = &dmesg_restrict,
                                      ^~~~~~~~~~~~~~
                                      kptr_restrict
   include/linux/printk.h:324:12: note: 'kptr_restrict' declared here
   extern int kptr_restrict;
              ^
>> kernel/printk/sysctl.c:82:13: warning: no previous prototype for function 'printk_sysctl_init' [-Wmissing-prototypes]
   void __init printk_sysctl_init(void)
               ^
   kernel/printk/sysctl.c:82:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __init printk_sysctl_init(void)
   ^
   static 
   1 warning and 3 errors generated.


vim +/printk_sysctl_init +3205 kernel/printk/printk.c

  3159	
  3160	/*
  3161	 * Some boot consoles access data that is in the init section and which will
  3162	 * be discarded after the initcalls have been run. To make sure that no code
  3163	 * will access this data, unregister the boot consoles in a late initcall.
  3164	 *
  3165	 * If for some reason, such as deferred probe or the driver being a loadable
  3166	 * module, the real console hasn't registered yet at this point, there will
  3167	 * be a brief interval in which no messages are logged to the console, which
  3168	 * makes it difficult to diagnose problems that occur during this time.
  3169	 *
  3170	 * To mitigate this problem somewhat, only unregister consoles whose memory
  3171	 * intersects with the init section. Note that all other boot consoles will
  3172	 * get unregistered when the real preferred console is registered.
  3173	 */
  3174	static int __init printk_late_init(void)
  3175	{
  3176		struct console *con;
  3177		int ret;
  3178	
  3179		for_each_console(con) {
  3180			if (!(con->flags & CON_BOOT))
  3181				continue;
  3182	
  3183			/* Check addresses that might be used for enabled consoles. */
  3184			if (init_section_intersects(con, sizeof(*con)) ||
  3185			    init_section_contains(con->write, 0) ||
  3186			    init_section_contains(con->read, 0) ||
  3187			    init_section_contains(con->device, 0) ||
  3188			    init_section_contains(con->unblank, 0) ||
  3189			    init_section_contains(con->data, 0)) {
  3190				/*
  3191				 * Please, consider moving the reported consoles out
  3192				 * of the init section.
  3193				 */
  3194				pr_warn("bootconsole [%s%d] uses init memory and must be disabled even before the real one is ready\n",
  3195					con->name, con->index);
  3196				unregister_console(con);
  3197			}
  3198		}
  3199		ret = cpuhp_setup_state_nocalls(CPUHP_PRINTK_DEAD, "printk:dead", NULL,
  3200						console_cpu_notify);
  3201		WARN_ON(ret < 0);
  3202		ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "printk:online",
  3203						console_cpu_notify, NULL);
  3204		WARN_ON(ret < 0);
> 3205		printk_sysctl_init();
  3206		return 0;
  3207	}
  3208	late_initcall(printk_late_init);
  3209	

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

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