linux-kernel - include/math-emu/double.h:59:21: warning: '__BIG

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Message-ID: <202507301656.7FEX6J5W-lkp@intel.com>
Date: Wed, 30 Jul 2025 16:59:37 +0800
From: kernel test robot <lkp@...el.com>
To: Paul Mackerras <paulus@...abs.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Madhavan Srinivasan <maddy@...ux.ibm.com>
Subject: include/math-emu/double.h:59:21: warning: '__BIG_ENDIAN' is not
 defined, evaluates to 0

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   4b290aae788e06561754b28c6842e4080957d3f7
commit: aca95fb6bb572a77f39d42d83ab72a965026577d powerpc/microwatt: Add SMP support
date:   5 months ago
config: powerpc64-randconfig-r064-20250730 (https://download.01.org/0day-ci/archive/20250730/202507301656.7FEX6J5W-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 8f09b03aebb71c154f3bbe725c29e3f47d37c26e)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250730/202507301656.7FEX6J5W-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/202507301656.7FEX6J5W-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from arch/powerpc/math-emu/math.c:14:
>> include/math-emu/double.h:59:21: warning: '__BIG_ENDIAN' is not defined, evaluates to 0 [-Wundef]
      59 | #if __BYTE_ORDER == __BIG_ENDIAN
         |                     ^
   1 warning generated.
--
   In file included from arch/powerpc/math-emu/fsqrts.c:8:
>> include/math-emu/double.h:59:21: warning: '__BIG_ENDIAN' is not defined, evaluates to 0 [-Wundef]
      59 | #if __BYTE_ORDER == __BIG_ENDIAN
         |                     ^
   In file included from arch/powerpc/math-emu/fsqrts.c:9:
>> include/math-emu/single.h:50:21: warning: '__BIG_ENDIAN' is not defined, evaluates to 0 [-Wundef]
      50 | #if __BYTE_ORDER == __BIG_ENDIAN
         |                     ^
   2 warnings generated.


vim +/__BIG_ENDIAN +59 include/math-emu/double.h

^1da177e4c3f41 Linus Torvalds 2005-04-16  54  
^1da177e4c3f41 Linus Torvalds 2005-04-16  55  union _FP_UNION_D
^1da177e4c3f41 Linus Torvalds 2005-04-16  56  {
^1da177e4c3f41 Linus Torvalds 2005-04-16  57    double flt;
^1da177e4c3f41 Linus Torvalds 2005-04-16  58    struct {
^1da177e4c3f41 Linus Torvalds 2005-04-16 @59  #if __BYTE_ORDER == __BIG_ENDIAN
^1da177e4c3f41 Linus Torvalds 2005-04-16  60      unsigned sign  : 1;
^1da177e4c3f41 Linus Torvalds 2005-04-16  61      unsigned exp   : _FP_EXPBITS_D;
^1da177e4c3f41 Linus Torvalds 2005-04-16  62      unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
^1da177e4c3f41 Linus Torvalds 2005-04-16  63      unsigned frac0 : _FP_W_TYPE_SIZE;
^1da177e4c3f41 Linus Torvalds 2005-04-16  64  #else
^1da177e4c3f41 Linus Torvalds 2005-04-16  65      unsigned frac0 : _FP_W_TYPE_SIZE;
^1da177e4c3f41 Linus Torvalds 2005-04-16  66      unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
^1da177e4c3f41 Linus Torvalds 2005-04-16  67      unsigned exp   : _FP_EXPBITS_D;
^1da177e4c3f41 Linus Torvalds 2005-04-16  68      unsigned sign  : 1;
^1da177e4c3f41 Linus Torvalds 2005-04-16  69  #endif
^1da177e4c3f41 Linus Torvalds 2005-04-16  70    } bits __attribute__((packed));
^1da177e4c3f41 Linus Torvalds 2005-04-16  71  };
^1da177e4c3f41 Linus Torvalds 2005-04-16  72  

:::::: The code at line 59 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2

:::::: TO: Linus Torvalds <torvalds@...970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@...970.osdl.org>

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