[linux-next:master 3974/5236] pid_max.c:42:15: warning: implicit declaration of function 'mount'

[linux-next:master 3974/5236] pid_max.c:42:15: warning: implicit declaration of function 'mount'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   8155b4ef3466f0e289e8fcc9e6e62f3f4dceeac2
commit: ef5bbd2a286805b0f97b5fa8616d28a84336ee7b [3974/5236] Merge branch 'vfs-6.14.mount' into vfs.all
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/20241222/202412222015.lMBH62zB-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/202412222015.lMBH62zB-lkp@intel.com/

All warnings (new ones prefixed by >>):

   pid_max.c: In function 'pid_max_cb':
>> pid_max.c:42:15: warning: implicit declaration of function 'mount' [-Wimplicit-function-declaration]
      42 |         ret = mount("", "/", NULL, MS_PRIVATE | MS_REC, 0);
         |               ^~~~~
   pid_max.c:42:36: error: 'MS_PRIVATE' undeclared (first use in this function); did you mean 'MAP_PRIVATE'?
      42 |         ret = mount("", "/", NULL, MS_PRIVATE | MS_REC, 0);
         |                                    ^~~~~~~~~~
         |                                    MAP_PRIVATE
   pid_max.c:42:36: note: each undeclared identifier is reported only once for each function it appears in
   pid_max.c:42:49: error: 'MS_REC' undeclared (first use in this function)
      42 |         ret = mount("", "/", NULL, MS_PRIVATE | MS_REC, 0);
         |                                                 ^~~~~~
>> pid_max.c:48:9: warning: implicit declaration of function 'umount2'; did you mean 'SYS_umount2'? [-Wimplicit-function-declaration]
      48 |         umount2("/proc", MNT_DETACH);
         |         ^~~~~~~
         |         SYS_umount2
   pid_max.c:48:26: error: 'MNT_DETACH' undeclared (first use in this function)
      48 |         umount2("/proc", MNT_DETACH);
         |                          ^~~~~~~~~~
   pid_max.c: In function 'pid_max_nested_inner':
   pid_max.c:88:36: error: 'MS_PRIVATE' undeclared (first use in this function); did you mean 'MAP_PRIVATE'?
      88 |         ret = mount("", "/", NULL, MS_PRIVATE | MS_REC, 0);
         |                                    ^~~~~~~~~~
         |                                    MAP_PRIVATE
   pid_max.c:88:49: error: 'MS_REC' undeclared (first use in this function)
      88 |         ret = mount("", "/", NULL, MS_PRIVATE | MS_REC, 0);
         |                                                 ^~~~~~
   pid_max.c:94:26: error: 'MNT_DETACH' undeclared (first use in this function)
      94 |         umount2("/proc", MNT_DETACH);
         |                          ^~~~~~~~~~
   pid_max.c: In function 'pid_max_nested_outer':
   pid_max.c:163:36: error: 'MS_PRIVATE' undeclared (first use in this function); did you mean 'MAP_PRIVATE'?
     163 |         ret = mount("", "/", NULL, MS_PRIVATE | MS_REC, 0);
         |                                    ^~~~~~~~~~
         |                                    MAP_PRIVATE
   pid_max.c:163:49: error: 'MS_REC' undeclared (first use in this function)
     163 |         ret = mount("", "/", NULL, MS_PRIVATE | MS_REC, 0);
         |                                                 ^~~~~~
   pid_max.c:169:26: error: 'MNT_DETACH' undeclared (first use in this function)
     169 |         umount2("/proc", MNT_DETACH);
         |                          ^~~~~~~~~~
   pid_max.c: In function 'pid_max_nested_limit_inner':
   pid_max.c:232:36: error: 'MS_PRIVATE' undeclared (first use in this function); did you mean 'MAP_PRIVATE'?
     232 |         ret = mount("", "/", NULL, MS_PRIVATE | MS_REC, 0);
         |                                    ^~~~~~~~~~
         |                                    MAP_PRIVATE
   pid_max.c:232:49: error: 'MS_REC' undeclared (first use in this function)
     232 |         ret = mount("", "/", NULL, MS_PRIVATE | MS_REC, 0);
         |                                                 ^~~~~~
   pid_max.c:238:26: error: 'MNT_DETACH' undeclared (first use in this function)
     238 |         umount2("/proc", MNT_DETACH);
         |                          ^~~~~~~~~~
   pid_max.c: In function 'pid_max_nested_limit_outer':
   pid_max.c:289:36: error: 'MS_PRIVATE' undeclared (first use in this function); did you mean 'MAP_PRIVATE'?
     289 |         ret = mount("", "/", NULL, MS_PRIVATE | MS_REC, 0);
         |                                    ^~~~~~~~~~
         |                                    MAP_PRIVATE
   pid_max.c:289:49: error: 'MS_REC' undeclared (first use in this function)
     289 |         ret = mount("", "/", NULL, MS_PRIVATE | MS_REC, 0);
         |                                                 ^~~~~~
   pid_max.c:295:26: error: 'MNT_DETACH' undeclared (first use in this function)
     295 |         umount2("/proc", MNT_DETACH);
         |                          ^~~~~~~~~~

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