[thomas-weissschuh:b4/auxclock-nanosleep 17/42] kernel/time/aux_clock_test.c:184:18: warning: integer overflow in expression of type 'long int' results in '705032704'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/thomas.weissschuh/linux.git b4/auxclock-nanosleep
head:   368883ddc7ac709883254193a4588fdf9b2da65a
commit: 05ab3171697e70cdc4302f27ef62d851a2580f93 [17/42] timekeeping: Add a test for auxiliary to monotonic clock conversions
config: arc-randconfig-002-20260911 (https://download.01.org/0day-ci/archive/20260911/202609111530.PtcoH3H4-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260911/202609111530.PtcoH3H4-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/202609111530.PtcoH3H4-lkp@intel.com/

All warnings (new ones prefixed by >>):

   kernel/time/aux_clock_test.c: In function 'mono_conv_edge_cases':
>> kernel/time/aux_clock_test.c:184:18: warning: integer overflow in expression of type 'long int' results in '705032704' [-Woverflow]
     small_delta = 5 * NSEC_PER_SEC;
                     ^
   kernel/time/aux_clock_test.c:186:28: warning: integer overflow in expression of type 'long int' results in '765657088' [-Woverflow]
     large_delta = 365 * 86400 * NSEC_PER_SEC;
                               ^


vim +184 kernel/time/aux_clock_test.c

   173	
   174	/* Mostly for development only. */
   175	static void mono_conv_edge_cases(struct kunit *test)
   176	{
   177		ktime_t mono_base, aux_base, small_delta, large_delta;
   178		struct tk_aux_mono_conv conv;
   179		ktime_t converted_mono;
   180		bool is_before;
   181	
   182		mono_base = 0;
   183		aux_base = 0;
 > 184		small_delta = 5 * NSEC_PER_SEC;
   185		/* 1 year */
   186		large_delta = 365 * 86400 * NSEC_PER_SEC;
   187	
   188		setup_aux_mono_conv(&conv, 5, mono_base, aux_base);
   189	
   190		/* delta = 0 */
   191		is_before = ktime_aux_before_mono_and_convert(&conv, aux_base, mono_base, &converted_mono);
   192		KUNIT_EXPECT_FALSE(test, is_before);
   193	
   194		is_before = ktime_aux_before_mono_and_convert(&conv, aux_base, mono_base + 1,
   195							      &converted_mono);
   196		KUNIT_EXPECT_TRUE(test, is_before);
   197		KUNIT_EXPECT_EQ(test, converted_mono, mono_base);
   198	
   199		/* positive small delta */
   200		is_before = ktime_aux_before_mono_and_convert(&conv, aux_base + small_delta, mono_base,
   201							      &converted_mono);
   202		KUNIT_EXPECT_FALSE(test, is_before);
   203	
   204		is_before = ktime_aux_before_mono_and_convert(&conv, aux_base, mono_base + small_delta,
   205							      &converted_mono);
   206		KUNIT_EXPECT_TRUE(test, is_before);
   207		KUNIT_EXPECT_EQ(test, converted_mono, mono_base);
   208	
   209		/* positive large delta */
   210		is_before = ktime_aux_before_mono_and_convert(&conv, aux_base + large_delta, mono_base,
   211							      &converted_mono);
   212		KUNIT_EXPECT_FALSE(test, is_before);
   213	
   214		is_before = ktime_aux_before_mono_and_convert(&conv, aux_base, mono_base + large_delta,
   215							      &converted_mono);
   216		KUNIT_EXPECT_TRUE(test, is_before);
   217		KUNIT_EXPECT_EQ(test, converted_mono, mono_base);
   218	
   219		/* negative small delta */
   220		is_before = ktime_aux_before_mono_and_convert(&conv, aux_base - small_delta, mono_base,
   221							      &converted_mono);
   222		KUNIT_EXPECT_TRUE(test, is_before);
   223		KUNIT_EXPECT_EQ(test, converted_mono, -4761904702);
   224	
   225		is_before = ktime_aux_before_mono_and_convert(&conv, aux_base, mono_base - small_delta,
   226							      &converted_mono);
   227		KUNIT_EXPECT_FALSE(test, is_before);
   228	
   229		/* negative large delta */
   230		is_before = ktime_aux_before_mono_and_convert(&conv, aux_base - large_delta, mono_base,
   231							      &converted_mono);
   232		KUNIT_EXPECT_TRUE(test, is_before);
   233		KUNIT_EXPECT_EQ(test, converted_mono, -30034285333871842);
   234	
   235		is_before = ktime_aux_before_mono_and_convert(&conv, aux_base, mono_base - large_delta,
   236							      &converted_mono);
   237		KUNIT_EXPECT_FALSE(test, is_before);
   238	}
   239	

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