Re: [PATCH v4 07/10] kunit: string-stream: Decouple string_stream from kunit

[kernel test robot]

Hi Richard,

kernel test robot noticed the following build warnings:

[auto build test WARNING on shuah-kselftest/kunit]
[also build test WARNING on shuah-kselftest/kunit-fixes linus/master v6.5-rc6 next-20230809]
[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-Improve-testing-of-string_stream/20230814-212947
base:   https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git kunit
patch link:    https://lore.kernel.org/r/20230814132309.32641-8-rf%40opensource.cirrus.com
patch subject: [PATCH v4 07/10] kunit: string-stream: Decouple string_stream from kunit
config: hexagon-randconfig-r014-20230815 (https://download.01.org/0day-ci/archive/20230815/202308150347.LvFXkSdz-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230815/202308150347.LvFXkSdz-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308150347.LvFXkSdz-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> lib/kunit/string-stream.c:199:38: warning: cast from 'void (*)(struct string_stream *)' to 'kunit_action_t *' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
     199 |         if (kunit_add_action_or_reset(test, (kunit_action_t *)raw_free_string_stream, stream) != 0)
         |                                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler.h:55:47: note: expanded from macro 'if'
      55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
         |                                               ^~~~
   include/linux/compiler.h:57:52: note: expanded from macro '__trace_if_var'
      57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
         |                                                    ^~~~
>> lib/kunit/string-stream.c:199:38: warning: cast from 'void (*)(struct string_stream *)' to 'kunit_action_t *' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
     199 |         if (kunit_add_action_or_reset(test, (kunit_action_t *)raw_free_string_stream, stream) != 0)
         |                                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler.h:55:47: note: expanded from macro 'if'
      55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
         |                                               ^~~~
   include/linux/compiler.h:57:61: note: expanded from macro '__trace_if_var'
      57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
         |                                                             ^~~~
>> lib/kunit/string-stream.c:199:38: warning: cast from 'void (*)(struct string_stream *)' to 'kunit_action_t *' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
     199 |         if (kunit_add_action_or_reset(test, (kunit_action_t *)raw_free_string_stream, stream) != 0)
         |                                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler.h:55:47: note: expanded from macro 'if'
      55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
         |                                               ^~~~
   include/linux/compiler.h:57:86: note: expanded from macro '__trace_if_var'
      57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
         |                                                                                      ^~~~
   include/linux/compiler.h:68:3: note: expanded from macro '__trace_if_value'
      68 |         (cond) ?                                        \
         |          ^~~~
   lib/kunit/string-stream.c:210:29: warning: cast from 'void (*)(struct string_stream *)' to 'kunit_action_t *' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
     210 |         kunit_release_action(test, (kunit_action_t *)raw_free_string_stream, (void *)stream);
         |                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 warnings generated.


vim +199 lib/kunit/string-stream.c

   188	
   189	struct string_stream *alloc_string_stream(struct kunit *test, gfp_t gfp)
   190	{
   191		struct string_stream *stream;
   192	
   193		stream = raw_alloc_string_stream(gfp);
   194		if (IS_ERR(stream))
   195			return stream;
   196	
   197		stream->test = test;
   198	
 > 199		if (kunit_add_action_or_reset(test, (kunit_action_t *)raw_free_string_stream, stream) != 0)
   200			return ERR_PTR(-ENOMEM);
   201	
   202		return stream;
   203	}
   204	

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