[ribalda:uvc-noncontiguous-v2 4/5] drivers/media/usb/uvc/uvc_video.c:909:8: warning: no previous prototype for 'uvc_video_dump_time_stats'

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

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tree:   https://github.com/ribalda/linux uvc-noncontiguous-v2
head:   042cd497739f71c8d4a83a67ee970369e2baca4a
commit: dbe2f5c7abe60edddfb6732bba6cf6184388ab15 [4/5] TEST-ONLY: media: uvcvideo: Add statistics for measuring performance
config: microblaze-randconfig-r032-20201209 (attached as .config)
compiler: microblaze-linux-gcc (GCC) 9.3.0
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/ribalda/linux/commit/dbe2f5c7abe60edddfb6732bba6cf6184388ab15
        git remote add ribalda https://github.com/ribalda/linux
        git fetch --no-tags ribalda uvc-noncontiguous-v2
        git checkout dbe2f5c7abe60edddfb6732bba6cf6184388ab15
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=microblaze 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/media/usb/uvc/uvc_video.c:909:8: warning: no previous prototype for 'uvc_video_dump_time_stats' [-Wmissing-prototypes]
     909 | size_t uvc_video_dump_time_stats(char *buf, size_t size,
         |        ^~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/media/usb/uvc/uvc_video.c:930:8: warning: no previous prototype for 'uvc_video_dump_speed' [-Wmissing-prototypes]
     930 | size_t uvc_video_dump_speed(char *buf, size_t size, const char *pfx, u64 bytes,
         |        ^~~~~~~~~~~~~~~~~~~~

vim +/uvc_video_dump_time_stats +909 drivers/media/usb/uvc/uvc_video.c

   908	
 > 909	size_t uvc_video_dump_time_stats(char *buf, size_t size,
   910					 struct uvc_stats_time *stat, const char *pfx)
   911	{
   912		unsigned int avg = 0;
   913		unsigned int std = 0;
   914	
   915		if (stat->qty) {
   916			avg = div_u64(stat->duration, stat->qty);
   917			std = int_sqrt64(div_u64(stat->duration2, stat->qty) -
   918					 avg * avg);
   919		}
   920	
   921		/* Stat durations are in nanoseconds, we present in micro-seconds */
   922		return scnprintf(
   923			buf, size,
   924			"%s: %llu/%u uS/qty: %u.%03u avg %u.%03u std %u.%03u min %u.%03u max (uS)\n",
   925			pfx, div_u64(stat->duration, 1000), stat->qty, avg / 1000,
   926			avg % 1000, std / 1000, std % 1000, stat->min / 1000,
   927			stat->min % 1000, stat->max / 1000, stat->max % 1000);
   928	}
   929	
 > 930	size_t uvc_video_dump_speed(char *buf, size_t size, const char *pfx, u64 bytes,
   931				    u64 milliseconds)
   932	{
   933		unsigned int rate = 0;
   934		bool gbit = false;
   935	
   936		if (milliseconds)
   937			rate = div_u64(bytes * 8, milliseconds);
   938	
   939		if (rate >= 1000000) {
   940			gbit = true;
   941			rate /= 1000;
   942		}
   943	
   944		/*
   945		 * bits/milliseconds == kilobits/seconds,
   946		 * presented here as Mbits/s (or Gbit/s) with 3 decimal places
   947		 */
   948		return scnprintf(buf, size, "%s: %d.%03d %sbits/s\n", pfx, rate / 1000,
   949				 rate % 1000, gbit ? "G" : "M");
   950	}
   951	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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