linux-kernel - cgroup_util.c:410:58: error: use of undeclared identifier 'O

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Date: Mon, 20 May 2024 09:24:35 +0800
From: kernel test robot <yujie.liu@...el.com>
To: Edward Liaw <edliaw@...gle.com>
CC: <oe-kbuild-all@...ts.linux.dev>, <linux-kernel@...r.kernel.org>, Tejun Heo
	<tj@...nel.org>
Subject: cgroup_util.c:410:58: error: use of undeclared identifier 'O_PATH'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   4b377b4868ef17b040065bd468668c707d2477a5
commit: c1457d9aad5ee2feafcf85aa9a58ab50500159d2 selftests/cgroup: Drop define _GNU_SOURCE
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce: linux/tools/testing/selftests/cgroup$ make

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 <yujie.liu@...el.com>
| Closes: https://lore.kernel.org/r/202405181620.zh4EErMk-lkp@intel.com/

All errors (new ones prefixed by >>):

>> cgroup_util.c:410:58: error: use of undeclared identifier 'O_PATH'
     410 |         return open(dir, O_DIRECTORY | O_CLOEXEC | O_NOFOLLOW | O_PATH);
         |                                                                 ^
>> cgroup_util.c:468:19: error: use of undeclared identifier 'O_TMPFILE'
     468 |         return open(".", O_TMPFILE | O_RDWR | O_EXCL);
         |                          ^
   2 errors generated.
--
>> test_core.c:804:8: error: call to undeclared function 'clone'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     804 |         pid = clone(lesser_ns_open_thread_fn, stack + sizeof(stack),
         |               ^
   test_core.c:804:8: note: did you mean 'close'?
   /usr/include/unistd.h:358:12: note: 'close' declared here
     358 | extern int close (int __fd);
         |            ^
   1 error generated.
>> cgroup_util.c:410:58: error: use of undeclared identifier 'O_PATH'
     410 |         return open(dir, O_DIRECTORY | O_CLOEXEC | O_NOFOLLOW | O_PATH);
         |                                                                 ^
>> cgroup_util.c:468:19: error: use of undeclared identifier 'O_TMPFILE'
     468 |         return open(".", O_TMPFILE | O_RDWR | O_EXCL);
         |                          ^
   2 errors generated.


vim +/O_PATH +410 tools/testing/selftests/cgroup/cgroup_util.c

9bd5910d7f3db2 Christian Brauner 2020-02-05  407  
9bd5910d7f3db2 Christian Brauner 2020-02-05  408  int dirfd_open_opath(const char *dir)
9bd5910d7f3db2 Christian Brauner 2020-02-05  409  {
9bd5910d7f3db2 Christian Brauner 2020-02-05 @410  	return open(dir, O_DIRECTORY | O_CLOEXEC | O_NOFOLLOW | O_PATH);
9bd5910d7f3db2 Christian Brauner 2020-02-05  411  }
9bd5910d7f3db2 Christian Brauner 2020-02-05  412  

:::::: The code at line 410 was first introduced by commit
:::::: 9bd5910d7f3db2f65be139d2679dd9daa4a3419a selftests/cgroup: add tests for cloning into cgroups

:::::: TO: Christian Brauner <christian.brauner@...ntu.com>
:::::: CC: Tejun Heo <tj@...nel.org>

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