Hi Dmitry,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[cannot apply to v5.3-rc8 next-20190904]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Dmitry-Safonov/restart_block-Prepare-the-ground-for-dumping-timeout/20190909-182945
config: i386-tinyconfig (attached as .config)
compiler: gcc-7 (Debian 7.4.0-11) 7.4.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

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

All errors (new ones prefixed by >>):

   fs/select.c: In function 'do_sys_ppoll':
>> fs/select.c:1089:9: error: implicit declaration of function 'set_compat_user_sigmask'; did you mean 'set_user_sigmask'? [-Werror=implicit-function-declaration]
      ret = set_compat_user_sigmask(sigmask, sigsetsize);
            ^~~~~~~~~~~~~~~~~~~~~~~
            set_user_sigmask
   cc1: some warnings being treated as errors

vim +1089 fs/select.c

  1058	
  1059	static int do_sys_ppoll(struct pollfd __user *ufds, unsigned int nfds,
  1060				void __user *tsp, const void __user *sigmask,
  1061				size_t sigsetsize, enum poll_time_type pt_type)
  1062	{
  1063		struct timespec64 ts, end_time, *to = NULL;
  1064		int ret;
  1065	
  1066		if (tsp) {
  1067			switch (pt_type) {
  1068			case PT_TIMESPEC:
  1069				if (get_timespec64(&ts, tsp))
  1070					return -EFAULT;
  1071				break;
  1072			case PT_OLD_TIMESPEC:
  1073				if (get_old_timespec32(&ts, tsp))
  1074					return -EFAULT;
  1075				break;
  1076			default:
  1077				WARN_ON_ONCE(1);
  1078				return -ENOSYS;
  1079			}
  1080	
  1081			to = &end_time;
  1082			if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
  1083				return -EINVAL;
  1084		}
  1085	
  1086		if (!in_compat_syscall())
  1087			ret = set_user_sigmask(sigmask, sigsetsize);
  1088		else
> 1089			ret = set_compat_user_sigmask(sigmask, sigsetsize);
  1090	
  1091		if (ret)
  1092			return ret;
  1093	
  1094		ret = do_sys_poll(ufds, nfds, to);
  1095		return poll_select_finish(&end_time, tsp, pt_type, ret);
  1096	}
  1097	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation