Re: [PATCH next 2/3] fortify: Optimise strnlen()

[kernel test robot <lkp@intel.com>]

Hi,

kernel test robot noticed the following build errors:

[auto build test ERROR on next-20260327]

url:    https://github.com/intel-lab-lkp/linux/commits/david-laight-linux-gmail-com/fortify-replace-__compiletime_lessthan-with-statically_true/20260331-041123
base:   next-20260327
patch link:    https://lore.kernel.org/r/20260330132003.3379-3-david.laight.linux%40gmail.com
patch subject: [PATCH next 2/3] fortify: Optimise strnlen()
config: x86_64-buildonly-randconfig-001-20260331 (https://download.01.org/0day-ci/archive/20260401/202604010835.IWCsUV7z-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260401/202604010835.IWCsUV7z-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/202604010835.IWCsUV7z-lkp@intel.com/

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: __fortify_undefined
   >>> referenced by fortify-string.h:290 (include/linux/fortify-string.h:290)
   >>>               vmlinux.o:(parse_early_param)
   >>> referenced by fortify-string.h:218 (include/linux/fortify-string.h:218)
   >>>               vmlinux.o:(parse_early_param)
   >>> referenced by fortify-string.h:290 (include/linux/fortify-string.h:290)
   >>>               vmlinux.o:(setup_boot_config)
   >>> referenced 2103 more times

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