Re: [RFC 1/1] eventpoll: support busy poll per epoll instance

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

Hi Joe,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build warnings:

[auto build test WARNING on perf-tools-next/perf-tools-next]
[also build test WARNING on tip/perf/core perf-tools/perf-tools linus/master horms-ipvs/master acme/perf/core v6.7 next-20240119]
[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/Joe-Damato/eventpoll-support-busy-poll-per-epoll-instance/20240120-084514
base:   https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git perf-tools-next
patch link:    https://lore.kernel.org/r/20240120004247.42036-2-jdamato%40fastly.com
patch subject: [RFC 1/1] eventpoll: support busy poll per epoll instance
config: i386-buildonly-randconfig-001-20240121 (https://download.01.org/0day-ci/archive/20240121/202401212239.LAqIJgfm-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240121/202401212239.LAqIJgfm-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/202401212239.LAqIJgfm-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> fs/eventpoll.c:398: warning: Function parameter or member 'start_time' not described in 'busy_loop_ep_timeout'
>> fs/eventpoll.c:398: warning: Function parameter or member 'ep' not described in 'busy_loop_ep_timeout'


vim +398 fs/eventpoll.c

   391	
   392	/**
   393	 * busy_loop_ep_timeout - check if busy poll has timed out. The timeout value
   394	 * from the epoll instance ep is preferred, but if it is not set fallback to
   395	 * the system-wide global via busy_loop_timeout.
   396	 */
   397	static inline bool busy_loop_ep_timeout(unsigned long start_time, struct eventpoll *ep)
 > 398	{
   399	#ifdef CONFIG_NET_RX_BUSY_POLL
   400		unsigned long bp_usec = READ_ONCE(ep->busy_poll_usecs);
   401	
   402		if (bp_usec) {
   403			unsigned long end_time = start_time + bp_usec;
   404			unsigned long now = busy_loop_current_time();
   405	
   406			return time_after(now, end_time);
   407		} else {
   408			return busy_loop_timeout(start_time);
   409		}
   410	#endif
   411		return true;
   412	}
   413	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki