lib/fortify_kunit.c:28:9: sparse: sparse: incompatible types for operation (==):

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   622322f53c6d9ddd3c2a4aad852b3e1adbd56da7
commit: 875bfd5276f31d09e811d31fca638b9f4d1205e8 fortify: Add KUnit test for FORTIFY_SOURCE internals
date:   8 months ago
config: s390-randconfig-s051-20230423 (https://download.01.org/0day-ci/archive/20230423/202304232034.zAYM3qkH-lkp@xxxxxxxxx/config)
compiler: s390-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=875bfd5276f31d09e811d31fca638b9f4d1205e8
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 875bfd5276f31d09e811d31fca638b9f4d1205e8
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202304232034.zAYM3qkH-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
   lib/fortify_kunit.c:28:9: sparse: sparse: undefined identifier '__compiletime_strlen'
   lib/fortify_kunit.c:28:9: sparse: sparse: undefined identifier '__compiletime_strlen'
>> lib/fortify_kunit.c:28:9: sparse: sparse: incompatible types for operation (==):
>> lib/fortify_kunit.c:28:9: sparse:    bad type const __left
>> lib/fortify_kunit.c:28:9: sparse:    int const __right
   lib/fortify_kunit.c:29:9: sparse: sparse: undefined identifier '__compiletime_strlen'
   lib/fortify_kunit.c:29:9: sparse: sparse: undefined identifier '__compiletime_strlen'
   lib/fortify_kunit.c:29:9: sparse: sparse: incompatible types for operation (==):
   lib/fortify_kunit.c:29:9: sparse:    bad type const __left
   lib/fortify_kunit.c:29:9: sparse:    int const __right
   lib/fortify_kunit.c:30:9: sparse: sparse: undefined identifier '__compiletime_strlen'
   lib/fortify_kunit.c:30:9: sparse: sparse: undefined identifier '__compiletime_strlen'
   lib/fortify_kunit.c:30:9: sparse: sparse: incompatible types for operation (==):
   lib/fortify_kunit.c:30:9: sparse:    bad type const __left
   lib/fortify_kunit.c:30:9: sparse:    int const __right
   lib/fortify_kunit.c:32:9: sparse: sparse: undefined identifier '__compiletime_strlen'
   lib/fortify_kunit.c:32:9: sparse: sparse: undefined identifier '__compiletime_strlen'
   lib/fortify_kunit.c:32:9: sparse: sparse: incompatible types for operation (==):
   lib/fortify_kunit.c:32:9: sparse:    bad type const __left
>> lib/fortify_kunit.c:32:9: sparse:    unsigned long const __right
   lib/fortify_kunit.c:34:9: sparse: sparse: undefined identifier '__compiletime_strlen'
   lib/fortify_kunit.c:34:9: sparse: sparse: undefined identifier '__compiletime_strlen'
   lib/fortify_kunit.c:34:9: sparse: sparse: incompatible types for operation (==):
   lib/fortify_kunit.c:34:9: sparse:    bad type const __left
   lib/fortify_kunit.c:34:9: sparse:    unsigned long const __right
   lib/fortify_kunit.c:56:16: sparse: sparse: undefined identifier '__compiletime_strlen'

vim +28 lib/fortify_kunit.c

    25	
    26	static void known_sizes_test(struct kunit *test)
    27	{
  > 28		KUNIT_EXPECT_EQ(test, __compiletime_strlen("88888888"), 8);
    29		KUNIT_EXPECT_EQ(test, __compiletime_strlen(array_of_10), 10);
    30		KUNIT_EXPECT_EQ(test, __compiletime_strlen(ptr_of_11), 11);
    31	
  > 32		KUNIT_EXPECT_EQ(test, __compiletime_strlen(array_unknown), SIZE_MAX);
    33		/* Externally defined and dynamically sized string pointer: */
    34		KUNIT_EXPECT_EQ(test, __compiletime_strlen(saved_command_line), SIZE_MAX);
    35	}
    36	

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