Re: [PATCH v2] io_uring: Add support for napi_busy_poll

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

Hi Olivier,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[cannot apply to v5.17-rc5 next-20220225]
[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]

url:    https://github.com/0day-ci/linux/commits/Olivier-Langlois/io_uring-Add-support-for-napi_busy_poll/20220228-012140
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2293be58d6a18cab800e25e42081bacb75c05752
config: mips-qi_lb60_defconfig (https://download.01.org/0day-ci/archive/20220228/202202280457.dz7FiDNh-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
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
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://github.com/0day-ci/linux/commit/65e72f78c66272f7cf0e87dfeef88f5b79de2d91
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Olivier-Langlois/io_uring-Add-support-for-napi_busy_poll/20220228-012140
        git checkout 65e72f78c66272f7cf0e87dfeef88f5b79de2d91
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash

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 >>):

>> fs/io_uring.c:7840:3: warning: comparison of distinct pointer types ('typeof ((to)) *' (aka 'long long *') and 'uint64_t *' (aka 'unsigned long long *')) [-Wcompare-distinct-pointer-types]
                   do_div(to, 1000);
                   ^~~~~~~~~~~~~~~~
   include/asm-generic/div64.h:222:28: note: expanded from macro 'do_div'
           (void)(((typeof((n)) *)0) == ((uint64_t *)0));  \
                  ~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~~
   1 warning generated.


vim +7840 fs/io_uring.c

  7826	
  7827	#ifdef CONFIG_NET_RX_BUSY_POLL
  7828	static void io_adjust_busy_loop_timeout(struct timespec64 *ts,
  7829						struct io_wait_queue *iowq)
  7830	{
  7831		unsigned busy_poll_to = READ_ONCE(sysctl_net_busy_poll);
  7832		struct timespec64 pollto = ns_to_timespec64(1000 * (s64)busy_poll_to);
  7833	
  7834		if (timespec64_compare(ts, &pollto) > 0) {
  7835			*ts = timespec64_sub(*ts, pollto);
  7836			iowq->busy_poll_to = busy_poll_to;
  7837		} else {
  7838			s64 to = timespec64_to_ns(ts);
  7839	
> 7840			do_div(to, 1000);
  7841			iowq->busy_poll_to = to;
  7842			ts->tv_sec = 0;
  7843			ts->tv_nsec = 0;
  7844		}
  7845	}
  7846	

---
0-DAY CI Kernel Test Service, Intel Corporation
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