[paulmck-rcu:dev.2024.03.27b 64/69] arch/xtensa/include/asm/cmpxchg.h:77:25: 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: b3b1a154281fc97efc4c1d5818a83c29c228dbd5 [64/69] xtensa: Emulate one-byte and two-byte cmpxchg
config: xtensa-allnoconfig (https://download.01.org/0day-ci/archive/20240329/202403292321.T55etywH-lkp@xxxxxxxxx/config)
compiler: xtensa-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240329/202403292321.T55etywH-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202403292321.T55etywH-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

   In file included from arch/xtensa/include/asm/atomic.h:19,
                    from include/linux/atomic.h:7,
                    from include/asm-generic/bitops/atomic.h:5,
                    from arch/xtensa/include/asm/bitops.h:192,
                    from include/linux/bitops.h:68,
                    from include/linux/log2.h:12,
                    from kernel/bounds.c:13:
   arch/xtensa/include/asm/cmpxchg.h: In function '__cmpxchg':
>> arch/xtensa/include/asm/cmpxchg.h:77:25: error: implicit declaration of function 'cmpxchg_emu_u8' [-Werror=implicit-function-declaration]
      77 |         case 1:  return cmpxchg_emu_u8((volatile u8 *)ptr, old, new);
         |                         ^~~~~~~~~~~~~~
>> arch/xtensa/include/asm/cmpxchg.h:78:25: error: implicit declaration of function 'cmpxchg_emu_u16' [-Werror=implicit-function-declaration]
      78 |         case 2:  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 +77 arch/xtensa/include/asm/cmpxchg.h

    72	
    73	static __inline__ unsigned long
    74	__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
    75	{
    76		switch (size) {
  > 77		case 1:  return cmpxchg_emu_u8((volatile u8 *)ptr, old, new);
  > 78		case 2:  return cmpxchg_emu_u16((volatile u16 *)ptr, old, new);
    79		case 4:  return __cmpxchg_u32(ptr, old, new);
    80		default: __cmpxchg_called_with_bad_pointer();
    81			 return old;
    82		}
    83	}
    84	

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