[djwong-xfs:zero-initialize-pmem 301/309] ./usr/include/linux/fsrefcounts.h:68:19: error: unknown type name 'size_t'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git zero-initialize-pmem
head:   f712bfd382f71deb666686b6d969dc10592e7d79
commit: 8b79a60325e0ecd5f6429d4178c7a988dbbecec1 [301/309] xfs: export reference count information to userspace
config: x86_64-randconfig-m001-20210920 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git/commit/?id=8b79a60325e0ecd5f6429d4178c7a988dbbecec1
        git remote add djwong-xfs https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git
        git fetch --no-tags djwong-xfs zero-initialize-pmem
        git checkout 8b79a60325e0ecd5f6429d4178c7a988dbbecec1
        # save the attached .config to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   In file included from <command-line>:32:
>> ./usr/include/linux/fsrefcounts.h:68:19: error: unknown type name 'size_t'
      68 | static __inline__ size_t
         |                   ^~~~~~

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Attachment: .config.gz
Description: application/gzip