Re: [PATCH] m68k: implement runtime consts

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

Hi Daniel,

kernel test robot noticed the following build warnings:

[auto build test WARNING on geert-m68k/for-next]
[also build test WARNING on geert-m68k/for-linus linus/master v6.18-rc7 next-20251126]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Daniel-Palmer/m68k-implement-runtime-consts/20251127-080652
base:   https://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k.git for-next
patch link:    https://lore.kernel.org/r/20251127000505.2117956-1-daniel%40thingy.jp
patch subject: [PATCH] m68k: implement runtime consts
config: m68k-allnoconfig (https://download.01.org/0day-ci/archive/20251127/202511270956.hzGiPzdZ-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251127/202511270956.hzGiPzdZ-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/202511270956.hzGiPzdZ-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from fs/dcache.c:38:
   arch/m68k/include/asm/runtime-const.h: In function '__runtime_fixup_ptr':
>> arch/m68k/include/asm/runtime-const.h:28:29: warning: unused variable 'end' [-Wunused-variable]
      28 |         const unsigned long end = start + sizeof(*value);
         |                             ^~~
   arch/m68k/include/asm/runtime-const.h: In function '__runtime_fixup_shift':
   arch/m68k/include/asm/runtime-const.h:51:29: warning: unused variable 'end' [-Wunused-variable]
      51 |         const unsigned long end = start + sizeof(*insn);
         |                             ^~~


vim +/end +28 arch/m68k/include/asm/runtime-const.h

    13	
    14	#define runtime_const_ptr(sym) ({				\
    15		typeof(sym) __ret;					\
    16		asm_inline("1:\t"					\
    17			"mov.l #0xcafef00d,%0\n\t"			\
    18			".pushsection runtime_ptr_" #sym ",\"a\"\n\t"	\
    19			".long 1b - .\n\t"				\
    20			".popsection"					\
    21			: "=a" (__ret));				\
    22		__ret; })
    23	
    24	static inline void __runtime_fixup_ptr(void *where, unsigned long val)
    25	{
    26		u32 *value = where + 2;
    27		const unsigned long start = ((unsigned long) where) + 2;
  > 28		const unsigned long end = start + sizeof(*value);
    29	
    30		*value = val;
    31	
    32		flush_icache_range(start, end);
    33	}
    34	

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