Re: [PATCH v5 20/44] drm/tests: Add a few tests around drm_fixed.h

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

Hi Harry,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm/drm-next]
[also build test ERROR on drm-exynos/exynos-drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-misc/drm-misc-next drm-tip/drm-tip linus/master v6.11-rc4 next-20240820]
[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/Harry-Wentland/drm-Add-helper-for-conversion-from-signed-magnitude/20240820-050138
base:   git://anongit.freedesktop.org/drm/drm drm-next
patch link:    https://lore.kernel.org/r/20240819205714.316380-21-harry.wentland%40amd.com
patch subject: [PATCH v5 20/44] drm/tests: Add a few tests around drm_fixed.h
config: parisc-randconfig-001-20240821 (https://download.01.org/0day-ci/archive/20240821/202408211157.n8ubZpFl-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240821/202408211157.n8ubZpFl-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/202408211157.n8ubZpFl-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/gpu/drm/tests/drm_fixp_test.c:6:
   drivers/gpu/drm/tests/drm_fixp_test.c: In function 'drm_test_sm2fixp':
>> drivers/gpu/drm/tests/drm_fixp_test.c:11:66: error: integer overflow in expression of type 'long long int' results in '9223372036854775807' [-Werror=overflow]
      11 |         KUNIT_EXPECT_EQ(test, 0x7fffffffffffffffll, ((1LL << 63) - 1));
         |                                                                  ^
   include/kunit/test.h:725:40: note: in definition of macro 'KUNIT_BASE_BINARY_ASSERTION'
     725 |         const typeof(right) __right = (right);                                 \
         |                                        ^~~~~
   include/kunit/test.h:920:9: note: in expansion of macro 'KUNIT_BINARY_INT_ASSERTION'
     920 |         KUNIT_BINARY_INT_ASSERTION(test,                                       \
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~
   include/kunit/test.h:917:9: note: in expansion of macro 'KUNIT_EXPECT_EQ_MSG'
     917 |         KUNIT_EXPECT_EQ_MSG(test, left, right, NULL)
         |         ^~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/tests/drm_fixp_test.c:11:9: note: in expansion of macro 'KUNIT_EXPECT_EQ'
      11 |         KUNIT_EXPECT_EQ(test, 0x7fffffffffffffffll, ((1LL << 63) - 1));
         |         ^~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +11 drivers/gpu/drm/tests/drm_fixp_test.c

     8	
     9	static void drm_test_sm2fixp(struct kunit *test)
    10	{
  > 11		KUNIT_EXPECT_EQ(test, 0x7fffffffffffffffll, ((1LL << 63) - 1));
    12	
    13		/* 1 */
    14		KUNIT_EXPECT_EQ(test, drm_int2fixp(1), drm_sm2fixp(1ull << DRM_FIXED_POINT));
    15	
    16		/* -1 */
    17		KUNIT_EXPECT_EQ(test, drm_int2fixp(-1), drm_sm2fixp((1ull << 63) | (1ull << DRM_FIXED_POINT)));
    18	
    19		/* 0.5 */
    20		KUNIT_EXPECT_EQ(test, drm_fixp_from_fraction(1, 2), drm_sm2fixp(1ull << (DRM_FIXED_POINT - 1)));
    21	
    22		/* -0.5 */
    23		KUNIT_EXPECT_EQ(test, drm_fixp_from_fraction(-1, 2), drm_sm2fixp((1ull << 63) | (1ull << (DRM_FIXED_POINT - 1))));
    24	

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