Re: [PATCH v3] sysctl: expose sysctl_check_table for unit testing and use it

[kernel test robot <lkp@intel.com>]

Hi John,

kernel test robot noticed the following build errors:

[auto build test ERROR on kees/for-next/kspp]
[also build test ERROR on linus/master sysctl/sysctl-next v6.13-rc7]
[cannot apply to kees/for-next/pstore]
[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/John-Sperbeck/sysctl-expose-sysctl_check_table-for-unit-testing-and-use-it/20250113-150214
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/kspp
patch link:    https://lore.kernel.org/r/20250113070001.143690-1-jsperbeck%40google.com
patch subject: [PATCH v3] sysctl: expose sysctl_check_table for unit testing and use it
config: um-randconfig-002-20250118 (https://download.01.org/0day-ci/archive/20250118/202501182003.Gfi63jzH-lkp@intel.com/config)
compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250118/202501182003.Gfi63jzH-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/202501182003.Gfi63jzH-lkp@intel.com/

All errors (new ones prefixed by >>):

>> kernel/sysctl-test.c:414:4: error: call to undeclared function 'sysctl_check_table_test_helper'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
                           sysctl_check_table_test_helper("foo", table_foo));
                           ^
   kernel/sysctl-test.c:416:4: error: call to undeclared function 'sysctl_check_table_test_helper'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
                           sysctl_check_table_test_helper("foo", table_bar));
                           ^
   kernel/sysctl-test.c:418:4: error: call to undeclared function 'sysctl_check_table_test_helper'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
                           sysctl_check_table_test_helper("foo", table_qux));
                           ^
   3 errors generated.


vim +/sysctl_check_table_test_helper +414 kernel/sysctl-test.c

   369	
   370	/*
   371	 * Test that registering an invalid extra value is not allowed.
   372	 */
   373	static void sysctl_test_register_sysctl_sz_invalid_extra_value(
   374			struct kunit *test)
   375	{
   376		unsigned char data = 0;
   377		struct ctl_table table_foo[] = {
   378			{
   379				.procname	= "foo",
   380				.data		= &data,
   381				.maxlen		= sizeof(u8),
   382				.mode		= 0644,
   383				.proc_handler	= proc_dou8vec_minmax,
   384				.extra1		= SYSCTL_FOUR,
   385				.extra2		= SYSCTL_ONE_THOUSAND,
   386			},
   387		};
   388	
   389		struct ctl_table table_bar[] = {
   390			{
   391				.procname	= "bar",
   392				.data		= &data,
   393				.maxlen		= sizeof(u8),
   394				.mode		= 0644,
   395				.proc_handler	= proc_dou8vec_minmax,
   396				.extra1		= SYSCTL_NEG_ONE,
   397				.extra2		= SYSCTL_ONE_HUNDRED,
   398			},
   399		};
   400	
   401		struct ctl_table table_qux[] = {
   402			{
   403				.procname	= "qux",
   404				.data		= &data,
   405				.maxlen		= sizeof(u8),
   406				.mode		= 0644,
   407				.proc_handler	= proc_dou8vec_minmax,
   408				.extra1		= SYSCTL_ZERO,
   409				.extra2		= SYSCTL_TWO_HUNDRED,
   410			},
   411		};
   412	
   413		KUNIT_EXPECT_EQ(test, -EINVAL,
 > 414				sysctl_check_table_test_helper("foo", table_foo));
   415		KUNIT_EXPECT_EQ(test, -EINVAL,
   416				sysctl_check_table_test_helper("foo", table_bar));
   417		KUNIT_EXPECT_EQ(test, 0,
   418				sysctl_check_table_test_helper("foo", table_qux));
   419	}
   420	

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