[linux-next:master 6791/7915] arch/mips/kernel/mips-mt.c:246:1: error: incompatible function pointer types initializing 'initcall_t' (aka 'int (*)(void)') with an expression of type 'void (struct maple_tree *)'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   d4a0ae62a277377de396850ed4b709b6bd9b7326
commit: 37f4270132af31dd08a209799d420f72bfddb49c [6791/7915] mm: Start tracking VMAs with maple tree
config: mips-maltaup_defconfig (https://download.01.org/0day-ci/archive/20220224/202202241635.ib4YRtz7-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
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 mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=37f4270132af31dd08a209799d420f72bfddb49c
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 37f4270132af31dd08a209799d420f72bfddb49c
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   arch/mips/kernel/mips-mt.c:50:6: warning: no previous prototype for function 'mips_mt_regdump' [-Wmissing-prototypes]
   void mips_mt_regdump(unsigned long mvpctl)
        ^
   arch/mips/kernel/mips-mt.c:50:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void mips_mt_regdump(unsigned long mvpctl)
   ^
   static 
   arch/mips/kernel/mips-mt.c:159:6: warning: no previous prototype for function 'mips_mt_set_cpuoptions' [-Wmissing-prototypes]
   void mips_mt_set_cpuoptions(void)
        ^
   arch/mips/kernel/mips-mt.c:159:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void mips_mt_set_cpuoptions(void)
   ^
   static 
>> arch/mips/kernel/mips-mt.c:233:19: error: conflicting types for 'mt_init'
   static int __init mt_init(void)
                     ^
   include/linux/maple_tree.h:589:20: note: previous definition is here
   static inline void mt_init(struct maple_tree *mt)
                      ^
>> arch/mips/kernel/mips-mt.c:246:1: error: incompatible function pointer types initializing 'initcall_t' (aka 'int (*)(void)') with an expression of type 'void (struct maple_tree *)' [-Werror,-Wincompatible-function-pointer-types]
   subsys_initcall(mt_init);
   ^               ~~~~~~~
   include/linux/init.h:286:30: note: expanded from macro 'subsys_initcall'
   #define subsys_initcall(fn)             __define_initcall(fn, 4)
                                           ^                 ~~
   include/linux/init.h:262:35: note: expanded from macro '__define_initcall'
   #define __define_initcall(fn, id) ___define_initcall(fn, id, .initcall##id)
                                     ^                  ~~
   include/linux/init.h:260:2: note: expanded from macro '___define_initcall'
           __unique_initcall(fn, id, __sec, __initcall_id(fn))
           ^                 ~~
   note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE'
   #define ___PASTE(a,b) a##b
                         ^
   <scratch space>:291:1: note: expanded from here
   __initcall__kmod_mips_mt__393_246_mt_init4
   ^
   include/linux/init.h:249:20: note: expanded from macro '____define_initcall'
           static initcall_t __name __used                         \
                             ^
   2 warnings and 2 errors generated.


vim +246 arch/mips/kernel/mips-mt.c

27a3bbaf4b1e23 Ralf Baechle 2007-02-07  232  
27a3bbaf4b1e23 Ralf Baechle 2007-02-07 @233  static int __init mt_init(void)
27a3bbaf4b1e23 Ralf Baechle 2007-02-07  234  {
27a3bbaf4b1e23 Ralf Baechle 2007-02-07  235  	struct class *mtc;
27a3bbaf4b1e23 Ralf Baechle 2007-02-07  236  
27a3bbaf4b1e23 Ralf Baechle 2007-02-07  237  	mtc = class_create(THIS_MODULE, "mt");
27a3bbaf4b1e23 Ralf Baechle 2007-02-07  238  	if (IS_ERR(mtc))
27a3bbaf4b1e23 Ralf Baechle 2007-02-07  239  		return PTR_ERR(mtc);
27a3bbaf4b1e23 Ralf Baechle 2007-02-07  240  
27a3bbaf4b1e23 Ralf Baechle 2007-02-07  241  	mt_class = mtc;
27a3bbaf4b1e23 Ralf Baechle 2007-02-07  242  
27a3bbaf4b1e23 Ralf Baechle 2007-02-07  243  	return 0;
27a3bbaf4b1e23 Ralf Baechle 2007-02-07  244  }
27a3bbaf4b1e23 Ralf Baechle 2007-02-07  245  
27a3bbaf4b1e23 Ralf Baechle 2007-02-07 @246  subsys_initcall(mt_init);

:::::: The code at line 246 was first introduced by commit
:::::: 27a3bbaf4b1e23a3afbae4d9f72b51a36859f74a [MIPS] VPE: Sprinkle device model code into code to make udev happier.

:::::: TO: Ralf Baechle <ralf@linux-mips.org>
:::::: CC: Ralf Baechle <ralf@linux-mips.org>

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