[paulmck-rcu:dev.2024.03.27b 63/69] arch/sh/include/asm/cmpxchg.h:60:24: error: implicit declaration of function 'cmpxchg_emu_u8'

[paulmck-rcu:dev.2024.03.27b 63/69] arch/sh/include/asm/cmpxchg.h:60:24: error: implicit declaration of function 'cmpxchg_emu_u8'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2024.03.27b
head:   786fab3085d764055a78edb54023420920344333
commit: 4977f14819143065158973013b51a3c1f926e61e [63/69] sh: Emulate one-byte and two-byte cmpxchg
config: sh-defconfig (https://download.01.org/0day-ci/archive/20240329/202403292318.88dppMPt-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240329/202403292318.88dppMPt-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202403292318.88dppMPt-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/sh/include/asm/atomic.h:19,
                    from include/linux/atomic.h:7,
                    from include/asm-generic/bitops/lock.h:5,
                    from arch/sh/include/asm/bitops.h:63,
                    from include/linux/bitops.h:68,
                    from include/linux/log2.h:12,
                    from kernel/bounds.c:13:
   arch/sh/include/asm/cmpxchg.h: In function '__cmpxchg':
>> arch/sh/include/asm/cmpxchg.h:60:24: error: implicit declaration of function 'cmpxchg_emu_u8' [-Werror=implicit-function-declaration]
      60 |                 return cmpxchg_emu_u8((volatile u8 *)ptr, old, new);
         |                        ^~~~~~~~~~~~~~
>> arch/sh/include/asm/cmpxchg.h:62:24: error: implicit declaration of function 'cmpxchg_emu_u16' [-Werror=implicit-function-declaration]
      62 |                 return cmpxchg_emu_u16((volatile u16 *)ptr, old, new);
         |                        ^~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors
   make[3]: *** [scripts/Makefile.build:117: kernel/bounds.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1197: prepare0] Error 2
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:240: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:240: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +/cmpxchg_emu_u8 +60 arch/sh/include/asm/cmpxchg.h

    54	
    55	static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
    56			unsigned long new, int size)
    57	{
    58		switch (size) {
    59		case 1:
  > 60			return cmpxchg_emu_u8((volatile u8 *)ptr, old, new);
    61		case 2:
  > 62			return cmpxchg_emu_u16((volatile u16 *)ptr, old, new);
    63		case 4:
    64			return __cmpxchg_u32(ptr, old, new);
    65		}
    66		__cmpxchg_called_with_bad_pointer();
    67		return old;
    68	}
    69	

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