Hi Xabier,

kernel test robot noticed the following build errors:

[auto build test ERROR on net/main]
[also build test ERROR on net-next/main linus/master next-20230906]
[cannot apply to shuah-kselftest/next shuah-kselftest/fixes horms-ipvs/master v6.5]
[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/Xabier-Marquiegui/ptp-support-multiple-timestamp-event-readers/20230906-194848
base:   net/main
patch link:    https://lore.kernel.org/r/20230906104754.1324412-4-reibax%40gmail.com
patch subject: [PATCH 3/3] ptp: support event queue reader channel masks
config: i386-randconfig-005-20230906 (https://download.01.org/0day-ci/archive/20230907/202309070203.1o2AVeeS-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230907/202309070203.1o2AVeeS-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 [off-list ref]
| Closes: https://lore.kernel.org/oe-kbuild-all/202309070203.1o2AVeeS-lkp@intel.com/ (local)

All errors (new ones prefixed by >>):

   In file included from <command-line>:32:

quoted

./usr/include/linux/ptp_clock.h:109:2: error: unknown type name 'pid_t'

     109 |  pid_t reader_pid; /* PID of process reading the timestamp event queue */
         |  ^~~~~

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