Re: [PATCH] rtc: Improve performance of rtc_time64_to_tm. Add tests.

[kernel test robot <lkp@xxxxxxxxx>]

Hi Cassio,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on abelloni/rtc-next]
[also build test ERROR on v5.13-rc3 next-20210528]
[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]

url:    https://github.com/0day-ci/linux/commits/Cassio-Neri/rtc-Improve-performance-of-rtc_time64_to_tm-Add-tests/20210530-003728
base:   https://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux.git rtc-next
config: i386-randconfig-r012-20210530 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/8747741de658b538ddea6a357747ad5fb9211b45
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Cassio-Neri/rtc-Improve-performance-of-rtc_time64_to_tm-Add-tests/20210530-003728
        git checkout 8747741de658b538ddea6a357747ad5fb9211b45
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   ld: drivers/rtc/lib_test.o: in function `rtc_time64_to_tm_test_date_range':
>> drivers/rtc/lib_test.c:56: undefined reference to `__divdi3'


vim +56 drivers/rtc/lib_test.c

    28	
    29	/*
    30	 * Checks every day in a 160000 years interval starting on 1970-01-01
    31	 * against the expected result.
    32	 */
    33	static void rtc_time64_to_tm_test_date_range(struct kunit *test)
    34	{
    35		/*
    36		 * 160000 years = (160000 / 400) * 400 years
    37		 *              = (160000 / 400) * 146097 days
    38		 *              = (160000 / 400) * 146097 * 86400 seconds
    39		 */
    40		time64_t total_secs = ((time64_t) 160000) / 400 * 146097 * 86400;
    41		int      year       = 1970;
    42		int      month      = 1;
    43		int      mday       = 1;
    44		int      yday       = 1;
    45	
    46		struct rtc_time result;
    47		time64_t secs;
    48	
    49		for (secs = 0; secs <= total_secs; secs += 86400) {
    50	
    51			rtc_time64_to_tm(secs, &result);
    52	
    53			#define FAIL_MSG "%d/%02d/%02d (%2d) : %ld", \
    54				year, month, mday, yday, secs/86400
    55	
  > 56			KUNIT_ASSERT_EQ_MSG(test, year - 1900, result.tm_year, FAIL_MSG);
    57			KUNIT_ASSERT_EQ_MSG(test, month - 1, result.tm_mon, FAIL_MSG);
    58			KUNIT_ASSERT_EQ_MSG(test, mday, result.tm_mday, FAIL_MSG);
    59			KUNIT_ASSERT_EQ_MSG(test, yday, result.tm_yday, FAIL_MSG);
    60	
    61			advance_date(&year, &month, &mday, &yday);
    62		}
    63	}
    64	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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