[PATCH v2 4/9] kasan: sw_tags: Support tag widths less than 8 bits

[kernel test robot]

Hi Samuel,

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 masahiroy-kbuild/for-next masahiroy-kbuild/fixes linus/master v6.12-rc4 next-20241022]
[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/Samuel-Holland/kasan-sw_tags-Use-arithmetic-shift-for-shadow-computation/20241022-100129
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20241022015913.3524425-5-samuel.holland%40sifive.com
patch subject: [PATCH v2 4/9] kasan: sw_tags: Support tag widths less than 8 bits
config: um-allnoconfig (https://download.01.org/0day-ci/archive/20241023/202410230319.eQozBGh7-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241023/202410230319.eQozBGh7-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410230319.eQozBGh7-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/um/kernel/asm-offsets.c:1:
   In file included from arch/x86/um/shared/sysdep/kernel-offsets.h:5:
   In file included from include/linux/crypto.h:17:
   In file included from include/linux/slab.h:234:
   In file included from include/linux/kasan.h:7:
   In file included from include/linux/kasan-tags.h:5:
>> arch/um/include/asm/kasan.h:19:2: error: "KASAN_SHADOW_SIZE is not defined for this sub-architecture"
      19 | #error "KASAN_SHADOW_SIZE is not defined for this sub-architecture"
         |  ^
   1 error generated.
   make[3]: *** [scripts/Makefile.build:102: arch/um/kernel/asm-offsets.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1203: prepare0] Error 2
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:224: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:224: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +19 arch/um/include/asm/kasan.h

5b301409e8bc5d7 Patricia Alfonso 2022-07-01  12  
5b301409e8bc5d7 Patricia Alfonso 2022-07-01  13  #ifdef CONFIG_X86_64
5b301409e8bc5d7 Patricia Alfonso 2022-07-01  14  #define KASAN_HOST_USER_SPACE_END_ADDR 0x00007fffffffffffUL
5b301409e8bc5d7 Patricia Alfonso 2022-07-01  15  /* KASAN_SHADOW_SIZE is the size of total address space divided by 8 */
5b301409e8bc5d7 Patricia Alfonso 2022-07-01  16  #define KASAN_SHADOW_SIZE ((KASAN_HOST_USER_SPACE_END_ADDR + 1) >> \
5b301409e8bc5d7 Patricia Alfonso 2022-07-01  17  			KASAN_SHADOW_SCALE_SHIFT)
5b301409e8bc5d7 Patricia Alfonso 2022-07-01  18  #else
5b301409e8bc5d7 Patricia Alfonso 2022-07-01 @19  #error "KASAN_SHADOW_SIZE is not defined for this sub-architecture"
5b301409e8bc5d7 Patricia Alfonso 2022-07-01  20  #endif /* CONFIG_X86_64 */
5b301409e8bc5d7 Patricia Alfonso 2022-07-01  21  

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