[thomas-weissschuh:b4/umh-h 6/6] net/bridge/br_stp_if.c:135:7: error: call to undeclared function 'call_usermodehelper'; ISO C99 and later do not support implicit function declarations

[thomas-weissschuh:b4/umh-h 6/6] net/bridge/br_stp_if.c:135:7: error: call to undeclared function 'call_usermodehelper'; ISO C99 and later do not support implicit function declarations

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/thomas.weissschuh/linux.git b4/umh-h
head:   15d07db86bdfa4c328a18630d82990d592395d4d
commit: 15d07db86bdfa4c328a18630d82990d592395d4d [6/6] modules/kmod: remove transitive of umh.h
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20250730/202507302142.GBJ0vrZI-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250730/202507302142.GBJ0vrZI-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/202507302142.GBJ0vrZI-lkp@intel.com/

All errors (new ones prefixed by >>):

>> net/bridge/br_stp_if.c:135:7: error: call to undeclared function 'call_usermodehelper'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     135 |         rc = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC);
         |              ^
>> net/bridge/br_stp_if.c:135:52: error: use of undeclared identifier 'UMH_WAIT_PROC'
     135 |         rc = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC);
         |                                                           ^
   2 errors generated.
--
>> fs/ocfs2/stackglue.c:432:8: error: call to undeclared function 'call_usermodehelper'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     432 |         ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
         |               ^
>> fs/ocfs2/stackglue.c:432:49: error: use of undeclared identifier 'UMH_WAIT_PROC'
     432 |         ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
         |                                                        ^
   2 errors generated.


vim +/call_usermodehelper +135 net/bridge/br_stp_if.c

^1da177e4c3f41 Linus Torvalds    2005-04-16  127  
308433155a67cb Vivien Didelot    2016-09-08  128  static int br_stp_call_user(struct net_bridge *br, char *arg)
9cde070874b822 Stephen Hemminger 2007-03-21  129  {
308433155a67cb Vivien Didelot    2016-09-08  130  	char *argv[] = { BR_STP_PROG, br->dev->name, arg, NULL };
9cde070874b822 Stephen Hemminger 2007-03-21  131  	char *envp[] = { NULL };
308433155a67cb Vivien Didelot    2016-09-08  132  	int rc;
308433155a67cb Vivien Didelot    2016-09-08  133  
308433155a67cb Vivien Didelot    2016-09-08  134  	/* call userspace STP and report program errors */
308433155a67cb Vivien Didelot    2016-09-08 @135  	rc = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC);
308433155a67cb Vivien Didelot    2016-09-08  136  	if (rc > 0) {
308433155a67cb Vivien Didelot    2016-09-08  137  		if (rc & 0xff)
308433155a67cb Vivien Didelot    2016-09-08  138  			br_debug(br, BR_STP_PROG " received signal %d\n",
308433155a67cb Vivien Didelot    2016-09-08  139  				 rc & 0x7f);
308433155a67cb Vivien Didelot    2016-09-08  140  		else
308433155a67cb Vivien Didelot    2016-09-08  141  			br_debug(br, BR_STP_PROG " exited with code %d\n",
308433155a67cb Vivien Didelot    2016-09-08  142  				 (rc >> 8) & 0xff);
308433155a67cb Vivien Didelot    2016-09-08  143  	}
308433155a67cb Vivien Didelot    2016-09-08  144  
308433155a67cb Vivien Didelot    2016-09-08  145  	return rc;
308433155a67cb Vivien Didelot    2016-09-08  146  }
308433155a67cb Vivien Didelot    2016-09-08  147  

:::::: The code at line 135 was first introduced by commit
:::::: 308433155a67cb097142292c8943e0aa8d1a1c79 net: bridge: add helper to call /sbin/bridge-stp

:::::: TO: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
:::::: CC: David S. Miller <davem@davemloft.net>

-- 
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https://github.com/intel/lkp-tests/wiki