Re: [PATCH next 12/14] bits: move the defitions of BIT() and BIT_ULL() back to linux/bits.h

[David Laight <david.laight.linux@gmail.com>]

On Thu, 22 Jan 2026 09:23:16 +0800
kernel test robot <lkp@intel.com> wrote:

> Hi,
> 
> kernel test robot noticed the following build errors:
> 
> [auto build test ERROR on next-20260120]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/david-laight-linux-gmail-com/overflow-Reduce-expansion-of-__type_max/20260122-013456
> base:   next-20260120
> patch link:    https://lore.kernel.org/r/20260121145731.3623-13-david.laight.linux%40gmail.com
> patch subject: [PATCH next 12/14] bits: move the defitions of BIT() and BIT_ULL() back to linux/bits.h
> config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20260122/202601220951.7C4YG7hB-lkp@intel.com/config)
> compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260122/202601220951.7C4YG7hB-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/202601220951.7C4YG7hB-lkp@intel.com/
> 
> All error/warnings (new ones prefixed by >>):
> 
>    In file included from kernel/bounds.c:14:
>    In file included from include/linux/log2.h:12:
>    In file included from include/linux/bitops.h:28:
>    In file included from include/asm-generic/bitops/generic-non-atomic.h:7:
>    In file included from arch/arm64/include/asm/barrier.h:14:
> >> arch/arm64/include/asm/alternative-macros.h:18:20: warning: 'unsigned' is not defined, evaluates to 0 [-Wundef]  
>       18 | #if ARM64_NCAPS >= ARM64_CB_BIT
...
> 
> 4c0bd995d73ed8 Mark Rutland 2022-09-12  17  
> 4c0bd995d73ed8 Mark Rutland 2022-09-12 @18  #if ARM64_NCAPS >= ARM64_CB_BIT
> 4c0bd995d73ed8 Mark Rutland 2022-09-12  19  #error "cpucaps have overflown ARM64_CB_BIT"
> 4c0bd995d73ed8 Mark Rutland 2022-09-12  20  #endif
> 7cda23da52ad79 Will Deacon  2020-06-30  21  

Unless I change BIT() back I'll change that to a static_assert().

	David