Re: [PATCH 1/4] RISC-V: create ISA string separately - not as part of cpuinfo

[kernel test robot]

Hi Heiko,

kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20230424]
[also build test WARNING on v6.3]
[cannot apply to soc/for-next linus/master kees/for-next/execve v6.3 v6.3-rc7 v6.3-rc6]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Heiko-Stuebner/RISC-V-create-ISA-string-separately-not-as-part-of-cpuinfo/20230425-035214
base:   next-20230424
patch link:    https://lore.kernel.org/r/20230424194911.264850-2-heiko.stuebner%40vrull.eu
patch subject: [PATCH 1/4] RISC-V: create ISA string separately - not as part of cpuinfo
config: riscv-allyesconfig (https://download.01.org/0day-ci/archive/20230425/202304250614.g73yVtvv-lkp@xxxxxxxxx/config)
compiler: riscv64-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/8f1a5a16616d673f2c82cdc54ff845fd8b125a21
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Heiko-Stuebner/RISC-V-create-ISA-string-separately-not-as-part-of-cpuinfo/20230425-035214
        git checkout 8f1a5a16616d673f2c82cdc54ff845fd8b125a21
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=riscv olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kernel/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202304250614.g73yVtvv-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   In file included from include/linux/string.h:254,
                    from include/linux/bitmap.h:11,
                    from include/linux/cpumask.h:12,
                    from include/linux/smp.h:13,
                    from include/linux/lockdep.h:14,
                    from include/linux/rcupdate.h:29,
                    from include/linux/rculist.h:11,
                    from include/linux/pid.h:5,
                    from include/linux/sched.h:14,
                    from include/linux/ratelimit.h:6,
                    from include/linux/dev_printk.h:16,
                    from include/linux/device.h:15,
                    from include/linux/node.h:18,
                    from include/linux/cpu.h:17,
                    from arch/riscv/kernel/cpu.c:6:
   In function 'strnlen',
       inlined from 'strncat' at include/linux/fortify-string.h:404:13,
       inlined from 'riscv_create_isa_string' at arch/riscv/kernel/cpu.c:269:4:
>> include/linux/fortify-string.h:29:33: warning: 'strlen' argument missing terminating nul [-Wstringop-overread]
      29 |                         __ret = __builtin_strlen(__p);          \
         |                                 ^~~~~~~~~~~~~~~~~~~~~
   include/linux/fortify-string.h:195:24: note: in expansion of macro '__compiletime_strlen'
     195 |         size_t p_len = __compiletime_strlen(p);
         |                        ^~~~~~~~~~~~~~~~~~~~
   arch/riscv/kernel/cpu.c: In function 'riscv_create_isa_string':
   arch/riscv/kernel/cpu.c:245:19: note: referenced argument declared here
     245 | static const char base_riscv_exts[13] = "imafdqcbkjpvh";
         |                   ^~~~~~~~~~~~~~~


vim +/strlen +29 include/linux/fortify-string.h

a28a6e860c6cf2 Francis Laniel 2021-02-25  18  
3009f891bb9f32 Kees Cook      2021-08-02  19  #define __compiletime_strlen(p)					\
3009f891bb9f32 Kees Cook      2021-08-02  20  ({								\
e9a40e1585d792 Kees Cook      2022-10-25  21  	char *__p = (char *)(p);				\
311fb40aa0569a Kees Cook      2022-09-02  22  	size_t __ret = SIZE_MAX;				\
9f7d69c5cd2390 Kees Cook      2022-09-19  23  	size_t __p_size = __member_size(p);			\
311fb40aa0569a Kees Cook      2022-09-02  24  	if (__p_size != SIZE_MAX &&				\
d07c0acb4f41cc Kees Cook      2022-09-02  25  	    __builtin_constant_p(*__p)) {			\
95cadae320be46 Qian Cai       2021-10-25  26  		size_t __p_len = __p_size - 1;			\
95cadae320be46 Qian Cai       2021-10-25  27  		if (__builtin_constant_p(__p[__p_len]) &&	\
95cadae320be46 Qian Cai       2021-10-25  28  		    __p[__p_len] == '\0')			\
95cadae320be46 Qian Cai       2021-10-25 @29  			__ret = __builtin_strlen(__p);		\
3009f891bb9f32 Kees Cook      2021-08-02  30  	}							\
95cadae320be46 Qian Cai       2021-10-25  31  	__ret;							\
3009f891bb9f32 Kees Cook      2021-08-02  32  })
3009f891bb9f32 Kees Cook      2021-08-02  33  

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https://github.com/intel/lkp-tests