linux-kernel - Re: [PATCH v4 next 6/9] lib: test_mul_u64_u64_div

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Message-ID: <202511020341.TEhkaR65-lkp@intel.com>
Date: Sun, 2 Nov 2025 03:35:20 +0800
From: kernel test robot <lkp@...el.com>
To: David Laight <david.laight.linux@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev,
	Linux Memory Management List <linux-mm@...ck.org>,
	David Laight <david.laight.linux@...il.com>,
	u.kleine-koenig@...libre.com, Nicolas Pitre <npitre@...libre.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Biju Das <biju.das.jz@...renesas.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Li RongQing <lirongqing@...du.com>, Yu Kuai <yukuai3@...wei.com>,
	Khazhismel Kumykov <khazhy@...omium.org>,
	Jens Axboe <axboe@...nel.dk>, x86@...nel.org
Subject: Re: [PATCH v4 next 6/9] lib: test_mul_u64_u64_div_u64: Test both
 generic and arch versions

Hi David,

kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20251029]

url:    https://github.com/intel-lab-lkp/linux/commits/David-Laight/lib-mul_u64_u64_div_u64-rename-parameter-c-to-d/20251030-025633
base:   next-20251029
patch link:    https://lore.kernel.org/r/20251029173828.3682-7-david.laight.linux%40gmail.com
patch subject: [PATCH v4 next 6/9] lib: test_mul_u64_u64_div_u64: Test both generic and arch versions
config: i386-randconfig-052-20251102 (https://download.01.org/0day-ci/archive/20251102/202511020341.TEhkaR65-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251102/202511020341.TEhkaR65-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/202511020341.TEhkaR65-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> lib/math/test_mul_u64_u64_div_u64.c:142:9: warning: "__div64_32" redefined
     142 | #define __div64_32 __div64_32
         |         ^~~~~~~~~~
   In file included from include/linux/math.h:6,
                    from include/linux/math64.h:6,
                    from include/linux/time.h:6,
                    from include/linux/stat.h:19,
                    from include/linux/module.h:13,
                    from lib/math/test_mul_u64_u64_div_u64.c:9:
   arch/x86/include/asm/div64.h:78:9: note: this is the location of the previous definition
      78 | #define __div64_32
         |         ^~~~~~~~~~


vim +/__div64_32 +142 lib/math/test_mul_u64_u64_div_u64.c

   140	
   141	/* Compile the generic mul_u64_add_u64_div_u64() code */
 > 142	#define __div64_32 __div64_32
   143	#define div_s64_rem div_s64_rem
   144	#define div64_u64_rem div64_u64_rem
   145	#define div64_u64 div64_u64
   146	#define div64_s64 div64_s64
   147	#define iter_div_u64_rem iter_div_u64_rem
   148	

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