linux-kernel - Re: [PATCH next 12/14] bits: move the defitions of BIT() and BIT

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Message-ID: <202601220951.7C4YG7hB-lkp@intel.com>
Date: Thu, 22 Jan 2026 09:23:16 +0800
From: kernel test robot <lkp@...el.com>
To: david.laight.linux@...il.com, Nathan Chancellor <nathan@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, Yury Norov <yury.norov@...il.com>,
	Jani Nikula <jani.nikula@...el.com>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Kees Cook <keescook@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Linux Memory Management List <linux-mm@...ck.org>,
	David Laight <david.laight.linux@...il.com>
Subject: Re: [PATCH next 12/14] bits: move the defitions of BIT() and
 BIT_ULL() back to linux/bits.h

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@...el.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
         |                    ^
   arch/arm64/include/asm/alternative-macros.h:16:22: note: expanded from macro 'ARM64_CB_BIT'
      16 | #define ARM64_CB_BIT    BIT(ARM64_CB_SHIFT)
         |                         ^
   include/linux/bits.h:94:18: note: expanded from macro 'BIT'
      94 | #define BIT(nr)         BIT_TYPE(unsigned long, nr)
         |                         ^
   include/linux/bits.h:88:4: note: expanded from macro 'BIT_TYPE'
      88 |         ((unsigned int)BIT_INPUT_CHECK(+(nr), BITS_PER_TYPE(type)) + ((type)1 << (nr)))
         |           ^
   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: error: token is not a valid binary operator in a preprocessor subexpression
      18 | #if ARM64_NCAPS >= ARM64_CB_BIT
         |                    ^~~~~~~~~~~~
   arch/arm64/include/asm/alternative-macros.h:16:22: note: expanded from macro 'ARM64_CB_BIT'
      16 | #define ARM64_CB_BIT    BIT(ARM64_CB_SHIFT)
         |                         ^~~~~~~~~~~~~~~~~~~
   include/linux/bits.h:94:18: note: expanded from macro 'BIT'
      94 | #define BIT(nr)         BIT_TYPE(unsigned long, nr)
         |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/bits.h:88:13: note: expanded from macro 'BIT_TYPE'
      88 |         ((unsigned int)BIT_INPUT_CHECK(+(nr), BITS_PER_TYPE(type)) + ((type)1 << (nr)))
         |           ~~~~~~~~ ^
   1 warning and 1 error generated.
   make[3]: *** [scripts/Makefile.build:182: kernel/bounds.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1330: prepare0] Error 2
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:248: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:248: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +18 arch/arm64/include/asm/alternative-macros.h

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  

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