[linux-next:master 2523/3504] arch/parisc/include/asm/cmpxchg.h:75:24: error: implicit declaration of function 'cmpxchg_emu_u16'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   727900b675b749c40ba1f6669c7ae5eb7eb8e837
commit: 2f6e60c348365df92f431f9101f7fa8f29c7a178 [2523/3504] parisc: Emulate two-byte cmpxchg
config: parisc-randconfig-r036-20230421 (https://download.01.org/0day-ci/archive/20240404/202404040944.CqvTiLwp-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240404/202404040944.CqvTiLwp-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/202404040944.CqvTiLwp-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/parisc/include/asm/atomic.h:10,
                    from include/linux/atomic.h:7,
                    from arch/parisc/include/asm/bitops.h:13,
                    from include/linux/bitops.h:68,
                    from include/linux/kernel.h:23,
                    from arch/parisc/include/asm/bug.h:5,
                    from include/linux/bug.h:5,
                    from include/linux/page-flags.h:10,
                    from kernel/bounds.c:10:
   arch/parisc/include/asm/cmpxchg.h: In function '__cmpxchg':
>> arch/parisc/include/asm/cmpxchg.h:75:24: error: implicit declaration of function 'cmpxchg_emu_u16' [-Werror=implicit-function-declaration]
      75 |         case 2: return cmpxchg_emu_u16((volatile u16 *)ptr, old, new);
         |                        ^~~~~~~~~~~~~~~
>> arch/parisc/include/asm/cmpxchg.h:75:66: error: 'new' undeclared (first use in this function); did you mean 'new_'?
      75 |         case 2: return cmpxchg_emu_u16((volatile u16 *)ptr, old, new);
         |                                                                  ^~~
         |                                                                  new_
   arch/parisc/include/asm/cmpxchg.h:75:66: note: each undeclared identifier is reported only once for each function it appears in
   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_u16 +75 arch/parisc/include/asm/cmpxchg.h

    64	
    65	/* don't worry...optimizer will get rid of most of this */
    66	static inline unsigned long
    67	__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
    68	{
    69		switch (size) {
    70	#ifdef CONFIG_64BIT
    71		case 8: return __cmpxchg_u64((u64 *)ptr, old, new_);
    72	#endif
    73		case 4: return __cmpxchg_u32((unsigned int *)ptr,
    74					     (unsigned int)old, (unsigned int)new_);
  > 75		case 2: return cmpxchg_emu_u16((volatile u16 *)ptr, old, new);
    76		case 1: return __cmpxchg_u8((u8 *)ptr, old & 0xff, new_ & 0xff);
    77		}
    78		__cmpxchg_called_with_bad_pointer();
    79		return old;
    80	}
    81	

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