linux-kernel - Re: mips64-linux-ld: lib/math/div64.c:undefined reference to `_

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Message-ID: <aXLLyFPyc2ljyLzx@rli9-mobl>
Date: Fri, 23 Jan 2026 09:15:52 +0800
From: Philip Li <philip.li@...el.com>
To: David Laight <david.laight.linux@...il.com>
CC: kernel test robot <lkp@...el.com>, <oe-kbuild-all@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>, Nicolas Pitre
	<npitre@...libre.com>
Subject: Re: mips64-linux-ld: lib/math/div64.c:undefined reference to
 `__multi3'

On Thu, Jan 22, 2026 at 02:57:52PM +0000, David Laight wrote:
> On Thu, 22 Jan 2026 22:43:28 +0800
> kernel test robot <lkp@...el.com> wrote:
> 
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   a66191c590b3b58eaff05d2277971f854772bd5b
> > commit: d10bb374c41e4c4dced04ae7d2fe2d782a5858a0 lib: mul_u64_u64_div_u64(): optimise the divide code
> > date:   9 weeks ago
> > config: mips-randconfig-r062-20260122 (https://download.01.org/0day-ci/archive/20260122/202601222217.uzed54La-lkp@intel.com/config)
> > compiler: mips64-linux-gcc (GCC) 8.5.0
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260122/202601222217.uzed54La-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/202601222217.uzed54La-lkp@intel.com/
> > 
> > All errors (new ones prefixed by >>):
> > 
> >    mips64-linux-ld: mips64-linux-ld: lib/math/div64.o: unable to get decompressed section .debug_info
> >    lib/math/div64.o: in function `mul_u64_add_u64_div_u64':
> >    lib/math/div64.c:(.text+0x60): undefined reference to `__multi3'
> > >> mips64-linux-ld: lib/math/div64.c:(.text+0x188): undefined reference to `__multi3'  
> > 
> 
> Known error, duplicate of a different build.
> Really a bug in gcc, fixable by changing the compiler version in a test.

Got it David, we will avoid further reporting on this. Sorry for the false positive.

> 
> 	David
>