arch/m68k/coldfire/m523x.c:82:20: error: implicit declaration of function 'read8'; did you mean 'readb'?

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

Hi Greg,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d2c9a99135da931377240942d44f3dea104cedb8
commit: e1f3a00670d13d1ed901125026c1f65394e670a5 m68k: coldfire: use ColdFire specifc IO access in SoC code
date:   4 weeks ago
config: m68k-randconfig-r122-20260704 (https://download.01.org/0day-ci/archive/20260704/202607040536.BiSGmESw-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 15.2.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260704/202607040536.BiSGmESw-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
| Fixes: e1f3a00670d1 ("m68k: coldfire: use ColdFire specifc IO access in SoC code")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202607040536.BiSGmESw-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/m68k/include/asm/io.h:6,
                    from include/linux/io.h:12,
                    from arch/m68k/coldfire/m523x.c:20:
   arch/m68k/coldfire/m523x.c: In function 'm523x_fec_init':
>> arch/m68k/coldfire/m523x.c:82:20: error: implicit declaration of function 'read8'; did you mean 'readb'? [-Wimplicit-function-declaration]
      82 |         mcf_write8(read8(MCFGPIO_PAR_FECI2C) | 0xf0, MCFGPIO_PAR_FECI2C);
         |                    ^~~~~
   arch/m68k/include/asm/io_no.h:23:75: note: in definition of macro '__raw_writeb'
      23 | #define __raw_writeb(b, addr) (void)((*(__force volatile u8 *) (addr)) = (b))
         |                                                                           ^
   arch/m68k/coldfire/m523x.c:82:9: note: in expansion of macro 'mcf_write8'
      82 |         mcf_write8(read8(MCFGPIO_PAR_FECI2C) | 0xf0, MCFGPIO_PAR_FECI2C);
         |         ^~~~~~~~~~


vim +82 arch/m68k/coldfire/m523x.c

    78	
    79	static void __init m523x_fec_init(void)
    80	{
    81		/* Set multi-function pins to ethernet use */
  > 82		mcf_write8(read8(MCFGPIO_PAR_FECI2C) | 0xf0, MCFGPIO_PAR_FECI2C);
    83	}
    84	

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