[linux-next:master 14086/14440] lib/cmdline.c:188: undefined reference to `__efistub___lshrdi3'

[linux-next:master 14086/14440] lib/cmdline.c:188: undefined reference to `__efistub___lshrdi3'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   b9303e6bff706758c167af686b5315ad00233bf8
commit: 7f448f913d6f048e448df40a877be6f5afb5249d [14086/14440] lib: fix memparse() to handle overflow
config: riscv-randconfig-001-20260504 (https://download.01.org/0day-ci/archive/20260504/202605041353.nsZSMiIC-lkp@intel.com/config)
compiler: riscv32-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260504/202605041353.nsZSMiIC-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202605041353.nsZSMiIC-lkp@intel.com/

All errors (new ones prefixed by >>):

   riscv32-linux-ld: ./drivers/firmware/efi/libstub/lib-cmdline.stub.o: in function `memparse':
>> lib/cmdline.c:188: undefined reference to `__efistub___lshrdi3'


vim +188 lib/cmdline.c

   140	
   141	/**
   142	 *	memparse - parse a string with mem suffixes into a number
   143	 *	@ptr: Where parse begins
   144	 *	@retptr: (output) Optional pointer to next char after parse completes
   145	 *
   146	 *	Parses a string into a number.  The number stored at @ptr is
   147	 *	potentially suffixed with K, M, G, T, P, E.
   148	 */
   149	
   150	unsigned long long memparse(const char *ptr, char **retptr)
   151	{
   152		char *endptr;	/* local pointer to end of parsed string */
   153		unsigned long long ret = simple_strtoull(ptr, &endptr, 0);
   154		unsigned int shl = 0;
   155	
   156		/* Consume valid suffix even in case of overflow. */
   157		switch (*endptr) {
   158		case 'E':
   159		case 'e':
   160			shl += 10;
   161			fallthrough;
   162		case 'P':
   163		case 'p':
   164			shl += 10;
   165			fallthrough;
   166		case 'T':
   167		case 't':
   168			shl += 10;
   169			fallthrough;
   170		case 'G':
   171		case 'g':
   172			shl += 10;
   173			fallthrough;
   174		case 'M':
   175		case 'm':
   176			shl += 10;
   177			fallthrough;
   178		case 'K':
   179		case 'k':
   180			shl += 10;
   181			fallthrough;
   182		default:
   183			break;
   184		}
   185	
   186		if (shl && likely(ptr != endptr)) {
   187			/* Have valid suffix with preceding number. */
 > 188			if (unlikely(check_shl_overflow(ret, shl, &ret)))
   189				ret = ULLONG_MAX;
   190			endptr++;
   191		}
   192	
   193		if (retptr)
   194			*retptr = endptr;
   195	
   196		return ret;
   197	}
   198	EXPORT_SYMBOL(memparse);
   199	

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

Re: [linux-next:master 14086/14440] lib/cmdline.c:188: undefined reference to `__efistub___lshrdi3'

[Andrew Morton]

On Mon, 04 May 2026 13:22:00 +0800 kernel test robot <lkp@intel.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   b9303e6bff706758c167af686b5315ad00233bf8
> commit: 7f448f913d6f048e448df40a877be6f5afb5249d [14086/14440] lib: fix memparse() to handle overflow
> config: riscv-randconfig-001-20260504 (https://download.01.org/0day-ci/archive/20260504/202605041353.nsZSMiIC-lkp@intel.com/config)
> compiler: riscv32-linux-gcc (GCC) 8.5.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260504/202605041353.nsZSMiIC-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@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202605041353.nsZSMiIC-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
>    riscv32-linux-ld: ./drivers/firmware/efi/libstub/lib-cmdline.stub.o: in function `memparse':
> >> lib/cmdline.c:188: undefined reference to `__efistub___lshrdi3'

Still there.  

Thanks.  I've forgotten what's happening here, and I'm probably not the
only one!  I'll remove the "lib and lib/cmdline enhancements, v9"
series from mm.git - Dmitry, please let's start again?

Re: [linux-next:master 14086/14440] lib/cmdline.c:188: undefined reference to `__efistub___lshrdi3'

[Andy Shevchenko]

On Tue, May 12, 2026 at 08:59:08PM -0700, Andrew Morton wrote:
> On Mon, 04 May 2026 13:22:00 +0800 kernel test robot <lkp@intel.com> wrote:
> 
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> > head:   b9303e6bff706758c167af686b5315ad00233bf8
> > commit: 7f448f913d6f048e448df40a877be6f5afb5249d [14086/14440] lib: fix memparse() to handle overflow
> > config: riscv-randconfig-001-20260504 (https://download.01.org/0day-ci/archive/20260504/202605041353.nsZSMiIC-lkp@intel.com/config)
> > compiler: riscv32-linux-gcc (GCC) 8.5.0
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260504/202605041353.nsZSMiIC-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@intel.com>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202605041353.nsZSMiIC-lkp@intel.com/
> > 
> > All errors (new ones prefixed by >>):
> > 
> >    riscv32-linux-ld: ./drivers/firmware/efi/libstub/lib-cmdline.stub.o: in function `memparse':
> > >> lib/cmdline.c:188: undefined reference to `__efistub___lshrdi3'
> 
> Still there.  
> 
> Thanks.  I've forgotten what's happening here, and I'm probably not the
> only one!  I'll remove the "lib and lib/cmdline enhancements, v9"
> series from mm.git - Dmitry, please let's start again?

Yes, please. The consensus (almost?) was to get a v10 that incorporates /
combines the two:
- the v7 for risc-v fixes (available in ML)
- the v9 rebased on top of the above

-- 
With Best Regards,
Andy Shevchenko