Re: [PATCH bpf-next v1 03/11] bpf: Add function to extract program source info

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

Hi Kumar,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 43745d11bfd9683abdf08ad7a5cc403d6a9ffd15]

url:    https://github.com/intel-lab-lkp/linux/commits/Kumar-Kartikeya-Dwivedi/bpf-Introduce-bpf_dynptr_from_mem_slice/20250508-012020
base:   43745d11bfd9683abdf08ad7a5cc403d6a9ffd15
patch link:    https://lore.kernel.org/r/20250507171720.1958296-4-memxor%40gmail.com
patch subject: [PATCH bpf-next v1 03/11] bpf: Add function to extract program source info
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20250508/202505081842.Tgphc4hq-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250508/202505081842.Tgphc4hq-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/202505081842.Tgphc4hq-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/bitmap.h:13,
                    from include/linux/cpumask.h:12,
                    from arch/x86/include/asm/cpumask.h:5,
                    from arch/x86/include/asm/msr.h:11,
                    from arch/x86/include/asm/tsc.h:10,
                    from arch/x86/include/asm/timex.h:6,
                    from include/linux/timex.h:67,
                    from include/linux/time32.h:13,
                    from include/linux/time.h:60,
                    from include/linux/jiffies.h:10,
                    from include/linux/ktime.h:25,
                    from include/linux/timer.h:6,
                    from include/linux/workqueue.h:9,
                    from include/linux/bpf.h:10,
                    from include/linux/filter.h:9,
                    from kernel/bpf/core.c:21:
   In function 'kbasename',
       inlined from 'bpf_prog_get_file_line' at kernel/bpf/core.c:3240:11:
>> include/linux/string.h:387:28: warning: argument 1 null where non-null expected [-Wnonnull]
     387 |         const char *tail = strrchr(path, '/');
         |                            ^~~~~~~~~~~~~~~~~~
   kernel/bpf/core.c: In function 'bpf_prog_get_file_line':
   include/linux/string.h:183:15: note: in a call to function 'strrchr' declared 'nonnull'
     183 | extern char * strrchr(const char *,int);
         |               ^~~~~~~


vim +387 include/linux/string.h

639b9e34f15e4b Akinobu Mita    2012-07-30  379  
b18888ab256f05 Andy Shevchenko 2012-12-17  380  /**
b18888ab256f05 Andy Shevchenko 2012-12-17  381   * kbasename - return the last part of a pathname.
b18888ab256f05 Andy Shevchenko 2012-12-17  382   *
b18888ab256f05 Andy Shevchenko 2012-12-17  383   * @path: path to extract the filename from.
b18888ab256f05 Andy Shevchenko 2012-12-17  384   */
b18888ab256f05 Andy Shevchenko 2012-12-17  385  static inline const char *kbasename(const char *path)
b18888ab256f05 Andy Shevchenko 2012-12-17  386  {
b18888ab256f05 Andy Shevchenko 2012-12-17 @387  	const char *tail = strrchr(path, '/');
b18888ab256f05 Andy Shevchenko 2012-12-17  388  	return tail ? tail + 1 : path;
b18888ab256f05 Andy Shevchenko 2012-12-17  389  }
b18888ab256f05 Andy Shevchenko 2012-12-17  390  

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