linux-kernel - [rcu:dev.2021.08.03a 42/61] kernel/cpu.c:733:45: error: passing 'const char [19]' to parameter of type 'void *' discards qualifiers

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Message-ID: <202108060449.FKAE6ZRm-lkp@intel.com>
Date:   Fri, 6 Aug 2021 04:24:58 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [rcu:dev.2021.08.03a 42/61] kernel/cpu.c:733:45: error: passing
 'const char [19]' to parameter of type 'void *' discards qualifiers

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2021.08.03a
head:   b7fafd4e7d0eb2a91d3b682d2618f7fad7e34b14
commit: ee466fedb5a3507f3b2a9ecd64dae0d004097220 [42/61] EXP cpu: Add yet more CPU-hotplug progress debugging code
config: hexagon-randconfig-r005-20210804 (attached as .config)
compiler: clang version 12.0.0
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?id=ee466fedb5a3507f3b2a9ecd64dae0d004097220
        git remote add rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
        git fetch --no-tags rcu dev.2021.08.03a
        git checkout ee466fedb5a3507f3b2a9ecd64dae0d004097220
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=hexagon 

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

All errors (new ones prefixed by >>):

   kernel/cpu.c:135:6: error: redefinition of 'cpu_hp_start_now'
   void cpu_hp_start_now(void)
        ^
   include/linux/cpu.h:147:20: note: previous definition is here
   static inline void cpu_hp_start_now(void) { }
                      ^
   kernel/cpu.c:144:6: error: redefinition of 'cpu_hp_stop_now'
   void cpu_hp_stop_now(void)
        ^
   include/linux/cpu.h:148:20: note: previous definition is here
   static inline void cpu_hp_stop_now(void) { }
                      ^
   kernel/cpu.c:155:6: error: conflicting types for 'cpu_hp_check_delay'
   void cpu_hp_check_delay(const char *s, const void *func)
        ^
   include/linux/cpu.h:149:20: note: previous definition is here
   static inline void cpu_hp_check_delay(const char *s, void *func) { }
                      ^
>> kernel/cpu.c:733:45: error: passing 'const char [19]' to parameter of type 'void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
           cpu_hp_check_delay("CPU-hotplug notifier", __func__);
                                                      ^~~~~~~~
   include/linux/cpu.h:149:60: note: passing argument to parameter 'func' here
   static inline void cpu_hp_check_delay(const char *s, void *func) { }
                                                              ^
   4 errors generated.


vim +733 kernel/cpu.c

   719	
   720	static int cpuhp_up_callbacks(unsigned int cpu, struct cpuhp_cpu_state *st,
   721				      enum cpuhp_state target)
   722	{
   723		enum cpuhp_state prev_state = st->state;
   724		int ret = 0;
   725	
   726		ret = cpuhp_invoke_callback_range(true, cpu, st, target);
   727		if (ret) {
   728			cpuhp_reset_state(st, prev_state);
   729			if (can_rollback_cpu(st))
   730				WARN_ON(cpuhp_invoke_callback_range(false, cpu, st,
   731								    prev_state));
   732		}
 > 733		cpu_hp_check_delay("CPU-hotplug notifier", __func__);
   734		return ret;
   735	}
   736	

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

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