lib/test_cpumask: Add for_each_cpu_and(not) tests

Following the recent introduction of for_each_andnot(), add some tests to
ensure for_each_cpu_and(not) results in the same as iterating over the
result of cpumask_and(not)().
Suggested-by: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Valentin Schneider <vschneid@redhat.com>

lib/cpumask_kunit.c

@@ -33,6 +33,19 @@
 		KUNIT_EXPECT_EQ_MSG((test), nr_cpu_ids - mask_weight, iter, MASK_MSG(mask));	\
 	} while (0)
 
+#define EXPECT_FOR_EACH_CPU_OP_EQ(test, op, mask1, mask2)			\
+	do {									\
+		const cpumask_t *m1 = (mask1);					\
+		const cpumask_t *m2 = (mask2);					\
+		int weight;                                                     \
+		int cpu, iter = 0;						\
+		cpumask_##op(&mask_tmp, m1, m2);                                \
+		weight = cpumask_weight(&mask_tmp);				\
+		for_each_cpu_##op(cpu, mask1, mask2)				\
+			iter++;							\
+		KUNIT_EXPECT_EQ((test), weight, iter);				\
+	} while (0)
+
 #define EXPECT_FOR_EACH_CPU_WRAP_EQ(test, mask)			\
 	do {							\
 		const cpumask_t *m = (mask);			\
@@ -54,6 +67,7 @@
 
 static cpumask_t mask_empty;
 static cpumask_t mask_all;
+static cpumask_t mask_tmp;
 
 static void test_cpumask_weight(struct kunit *test)
 {
@@ -101,10 +115,15 @@ static void test_cpumask_iterators(struct kunit *test)
 	EXPECT_FOR_EACH_CPU_EQ(test, &mask_empty);
 	EXPECT_FOR_EACH_CPU_NOT_EQ(test, &mask_empty);
 	EXPECT_FOR_EACH_CPU_WRAP_EQ(test, &mask_empty);
+	EXPECT_FOR_EACH_CPU_OP_EQ(test, and, &mask_empty, &mask_empty);
+	EXPECT_FOR_EACH_CPU_OP_EQ(test, and, cpu_possible_mask, &mask_empty);
+	EXPECT_FOR_EACH_CPU_OP_EQ(test, andnot, &mask_empty, &mask_empty);
 
 	EXPECT_FOR_EACH_CPU_EQ(test, cpu_possible_mask);
 	EXPECT_FOR_EACH_CPU_NOT_EQ(test, cpu_possible_mask);
 	EXPECT_FOR_EACH_CPU_WRAP_EQ(test, cpu_possible_mask);
+	EXPECT_FOR_EACH_CPU_OP_EQ(test, and, cpu_possible_mask, cpu_possible_mask);
+	EXPECT_FOR_EACH_CPU_OP_EQ(test, andnot, cpu_possible_mask, &mask_empty);
 }
 
 static void test_cpumask_iterators_builtin(struct kunit *test)