linux-kernel - Re: [PATCH v2 next 2/4] lib: mul_u64_u64_div_u64() Use BUG

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Message-ID: <20250518225035.2f887be7@pumpkin>
Date: Sun, 18 May 2025 22:50:35 +0100
From: David Laight <david.laight.linux@...il.com>
To: kernel test robot <lkp@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org,
 oe-kbuild-all@...ts.linux.dev, Linux Memory Management List
 <linux-mm@...ck.org>, 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>
Subject: Re: [PATCH v2 next 2/4] lib: mul_u64_u64_div_u64() Use BUG_ON() for
 divide by zero

On Sun, 18 May 2025 23:42:44 +0800
kernel test robot <lkp@...el.com> wrote:

> Hi David,
> 
> kernel test robot noticed the following build errors:
> 
> [auto build test ERROR on next-20250516]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/David-Laight/lib-mul_u64_u64_div_u64-rename-parameter-c-to-d/20250518-214037
> base:   next-20250516
> patch link:    https://lore.kernel.org/r/20250518133848.5811-3-david.laight.linux%40gmail.com
> patch subject: [PATCH v2 next 2/4] lib: mul_u64_u64_div_u64() Use BUG_ON() for divide by zero
> config: openrisc-allnoconfig (https://download.01.org/0day-ci/archive/20250518/202505182351.bPFZE1vO-lkp@intel.com/config)
> compiler: or1k-linux-gcc (GCC) 14.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250518/202505182351.bPFZE1vO-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/202505182351.bPFZE1vO-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
>    lib/math/div64.c: In function 'mul_u64_u64_div_u64':
> >> lib/math/div64.c:190:9: error: implicit declaration of function 'BUG_ON' [-Wimplicit-function-declaration]  
>      190 |         BUG_ON(!d);
>          |         ^~~~~~

compiles fine on x86 :-(