Re: [PATCH v4 04/18] x86: Add arch specific kasan functions

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

Hi Maciej,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on arm64/for-next/core tip/x86/mm linus/master v6.17-rc1 next-20250812]
[cannot apply to tip/x86/core]
[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/Maciej-Wieczor-Retman/kasan-sw_tags-Use-arithmetic-shift-for-shadow-computation/20250812-213257
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/b8d16cb57dc7ebfdcd0652eab030af4c6a3d0d63.1755004923.git.maciej.wieczor-retman%40intel.com
patch subject: [PATCH v4 04/18] x86: Add arch specific kasan functions
config: i386-buildonly-randconfig-003-20250813 (https://download.01.org/0day-ci/archive/20250813/202508130301.cL08gHbD-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250813/202508130301.cL08gHbD-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/202508130301.cL08gHbD-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/linux/kasan-tags.h:5,
                    from include/linux/kasan.h:7,
                    from include/linux/slab.h:260,
                    from lib/test_bitops.c:12:
   arch/x86/include/asm/kasan.h: In function '__tag_set':
>> arch/x86/include/asm/kasan.h:46:20: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
      46 |         u64 addr = (u64)__addr;
         |                    ^
>> arch/x86/include/asm/kasan.h:51:16: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
      51 |         return (void *)addr;
         |                ^
   cc1: all warnings being treated as errors


vim +46 arch/x86/include/asm/kasan.h

    43	
    44	static inline void *__tag_set(const void *__addr, u8 tag)
    45	{
  > 46		u64 addr = (u64)__addr;
    47	
    48		addr &= ~__tag_shifted(KASAN_TAG_MASK);
    49		addr |= __tag_shifted(tag);
    50	
  > 51		return (void *)addr;
    52	}
    53	

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