linux-kernel - arch/sh/include/cpu-sh3/cpu/dac.h:21:13: error: implicit declaration of function '__raw

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Message-ID: <202512240750.hdBj5TCs-lkp@intel.com>
Date: Wed, 24 Dec 2025 07:47:14 +0800
From: kernel test robot <lkp@...el.com>
To: Thomas Zimmermann <tzimmermann@...e.de>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
 Lee Jones <lee@...nel.org>,
 "Daniel Thompson (RISCstar)" <danielt@...nel.org>,
 Simona Vetter <simona.vetter@...ll.ch>
Subject: arch/sh/include/cpu-sh3/cpu/dac.h:21:13: error: implicit
 declaration of function '__raw_readb'

Hi Thomas,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b927546677c876e26eba308550207c2ddf812a43
commit: 243ce64b2b371cdf2cbc39c9422cb3047cab6de7 backlight: Do not include <linux/fb.h> in header file
date:   9 weeks ago
config: sh-randconfig-r073-20251224 (https://download.01.org/0day-ci/archive/20251224/202512240750.hdBj5TCs-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251224/202512240750.hdBj5TCs-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512240750.hdBj5TCs-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/video/backlight/hp680_bl.c:20:
   arch/sh/include/cpu-sh3/cpu/dac.h: In function 'sh_dac_enable':
>> arch/sh/include/cpu-sh3/cpu/dac.h:21:13: error: implicit declaration of function '__raw_readb' [-Wimplicit-function-declaration]
      21 |         v = __raw_readb(DACR);
         |             ^~~~~~~~~~~
>> arch/sh/include/cpu-sh3/cpu/dac.h:24:9: error: implicit declaration of function '__raw_writeb'; did you mean '__raw_write_lock'? [-Wimplicit-function-declaration]
      24 |         __raw_writeb(v,DACR);
         |         ^~~~~~~~~~~~
         |         __raw_write_lock


vim +/__raw_readb +21 arch/sh/include/cpu-sh3/cpu/dac.h

^1da177e4c3f41 include/asm-sh/cpu-sh3/dac.h      Linus Torvalds 2005-04-16  16  
^1da177e4c3f41 include/asm-sh/cpu-sh3/dac.h      Linus Torvalds 2005-04-16  17  
^1da177e4c3f41 include/asm-sh/cpu-sh3/dac.h      Linus Torvalds 2005-04-16  18  static __inline__ void sh_dac_enable(int channel)
^1da177e4c3f41 include/asm-sh/cpu-sh3/dac.h      Linus Torvalds 2005-04-16  19  {
^1da177e4c3f41 include/asm-sh/cpu-sh3/dac.h      Linus Torvalds 2005-04-16  20  	unsigned char v;
9d56dd3b083a3b arch/sh/include/cpu-sh3/cpu/dac.h Paul Mundt     2010-01-26 @21  	v = __raw_readb(DACR);
^1da177e4c3f41 include/asm-sh/cpu-sh3/dac.h      Linus Torvalds 2005-04-16  22  	if(channel) v |= DACR_DAOE1;
^1da177e4c3f41 include/asm-sh/cpu-sh3/dac.h      Linus Torvalds 2005-04-16  23  	else v |= DACR_DAOE0;
9d56dd3b083a3b arch/sh/include/cpu-sh3/cpu/dac.h Paul Mundt     2010-01-26 @24  	__raw_writeb(v,DACR);
^1da177e4c3f41 include/asm-sh/cpu-sh3/dac.h      Linus Torvalds 2005-04-16  25  }
^1da177e4c3f41 include/asm-sh/cpu-sh3/dac.h      Linus Torvalds 2005-04-16  26  

:::::: The code at line 21 was first introduced by commit
:::::: 9d56dd3b083a3bec56e9da35ce07baca81030b03 sh: Mass ctrl_in/outX to __raw_read/writeX conversion.

:::::: TO: Paul Mundt <lethal@...ux-sh.org>
:::::: CC: Paul Mundt <lethal@...ux-sh.org>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki