Re: [PATCH v5 09/10] kunit: Use string_stream for test log

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

Hi Richard,

kernel test robot noticed the following build warnings:

[auto build test WARNING on shuah-kselftest/kunit]
[also build test WARNING on next-20230824]
[cannot apply to shuah-kselftest/kunit-fixes linus/master v6.5-rc7]
[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/Richard-Fitzgerald/kunit-string-stream-Don-t-create-a-fragment-for-empty-strings/20230824-223722
base:   https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git kunit
patch link:    https://lore.kernel.org/r/20230824143129.1957914-10-rf%40opensource.cirrus.com
patch subject: [PATCH v5 09/10] kunit: Use string_stream for test log
config: hexagon-randconfig-002-20230825 (https://download.01.org/0day-ci/archive/20230825/202308251443.dMAw1CW3-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230825/202308251443.dMAw1CW3-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/202308251443.dMAw1CW3-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> lib/kunit/kunit-test.c:542:8: warning: unused variable 'full_log' [-Wunused-variable]
     542 |         char *full_log;
         |               ^
   lib/kunit/kunit-test.c:581:26: warning: cast from 'void (*)(const void *)' to 'kunit_action_t *' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
     581 |                 kunit_add_action(test, (kunit_action_t *)kfree, full_log);
         |                                        ^~~~~~~~~~~~~~~~~~~~~~~
   2 warnings generated.


vim +/full_log +542 lib/kunit/kunit-test.c

   533	
   534	/*
   535	 * Log tests call string_stream functions, which aren't exported. So only
   536	 * build this code if this test is built-in.
   537	 */
   538	#if IS_BUILTIN(CONFIG_KUNIT_TEST)
   539	static void kunit_log_test(struct kunit *test)
   540	{
   541		struct kunit_suite suite;
 > 542		char *full_log;
   543	
   544		suite.log = kunit_alloc_string_stream(test, GFP_KERNEL);
   545		KUNIT_ASSERT_NOT_ERR_OR_NULL(test, suite.log);
   546		string_stream_set_append_newlines(suite.log, true);
   547	
   548		kunit_log(KERN_INFO, test, "put this in log.");
   549		kunit_log(KERN_INFO, test, "this too.");
   550		kunit_log(KERN_INFO, &suite, "add to suite log.");
   551		kunit_log(KERN_INFO, &suite, "along with this.");
   552	

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