[riscv:for-next 6/6] arch/riscv/kernel/process.c:138:17: error: implicit declaration of function 'str_supported_unsupported'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git for-next
head:   a06776565b9e73512e880a95b66c198ae8e7e24a
commit: a06776565b9e73512e880a95b66c198ae8e7e24a [6/6] riscv: process: Use str_supported_unsupported() in compat_mode_detect()
config: riscv-randconfig-r2104-20260927 (https://download.01.org/0day-ci/archive/20260927/202609272053.WuVCdS70-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260927/202609272053.WuVCdS70-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/202609272053.WuVCdS70-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/asm-generic/bug.h:31,
                    from arch/riscv/include/asm/bug.h:85,
                    from include/linux/bug.h:5,
                    from arch/riscv/include/asm/current.h:13,
                    from include/linux/sched.h:12,
                    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/process.c:11:
   arch/riscv/kernel/process.c: In function 'compat_mode_detect':
>> arch/riscv/kernel/process.c:138:17: error: implicit declaration of function 'str_supported_unsupported' [-Wimplicit-function-declaration]
     138 |                 str_supported_unsupported(compat_mode_supported));
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/printk.h:483:33: note: in definition of macro 'printk_index_wrap'
     483 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                                 ^~~~~~~~~~~
   include/linux/printk.h:584:9: note: in expansion of macro 'printk'
     584 |         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
         |         ^~~~~~
   arch/riscv/kernel/process.c:137:9: note: in expansion of macro 'pr_info'
     137 |         pr_info("riscv: ELF compat mode %s",
         |         ^~~~~~~
   include/linux/kern_levels.h:5:25: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'int' [-Wformat=]
       5 | #define KERN_SOH        "\001"          /* ASCII Start Of Header */
         |                         ^~~~~~
   include/linux/printk.h:483:25: note: in definition of macro 'printk_index_wrap'
     483 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                         ^~~~
   include/linux/printk.h:584:9: note: in expansion of macro 'printk'
     584 |         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
         |         ^~~~~~
   include/linux/kern_levels.h:14:25: note: in expansion of macro 'KERN_SOH'
      14 | #define KERN_INFO       KERN_SOH "6"    /* informational */
         |                         ^~~~~~~~
   include/linux/printk.h:584:16: note: in expansion of macro 'KERN_INFO'
     584 |         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
         |                ^~~~~~~~~
   arch/riscv/kernel/process.c:137:9: note: in expansion of macro 'pr_info'
     137 |         pr_info("riscv: ELF compat mode %s",
         |         ^~~~~~~


vim +/str_supported_unsupported +138 arch/riscv/kernel/process.c

   126	
   127	static int __init compat_mode_detect(void)
   128	{
   129		unsigned long tmp = csr_read(CSR_STATUS);
   130	
   131		csr_write(CSR_STATUS, (tmp & ~SR_UXL) | SR_UXL_32);
   132		compat_mode_supported =
   133				(csr_read(CSR_STATUS) & SR_UXL) == SR_UXL_32;
   134	
   135		csr_write(CSR_STATUS, tmp);
   136	
   137		pr_info("riscv: ELF compat mode %s",
 > 138			str_supported_unsupported(compat_mode_supported));
   139	
   140		return 0;
   141	}
   142	early_initcall(compat_mode_detect);
   143	#endif
   144	

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