[PATCH v3 4/5] lib/cpumask_kunit: log mask contents

[Sander Vanheule <sander@svanheule.net>]

For extra context, log the contents of the masks under test.  This
should help with finding out why a certain test fails.

Link: https://lore.kernel.org/lkml/CABVgOSkPXBc-PWk1zBZRQ_Tt+Sz1ruFHBj3ixojymZF=Vi4tpQ@mail.gmail.com/
Suggested-by: David Gow <davidgow@google.com>
Signed-off-by: Sander Vanheule <sander@svanheule.net>
---
Changes in v3:
Instead of unconditionally printing the mask contents before each test
with kunit_info(), use *_MSG() macros to only print on failure.
Drop David's Reviewed-by since the patch is completely rewritten.

 lib/cpumask_kunit.c | 51 +++++++++++++++++++++++++++------------------
 1 file changed, 31 insertions(+), 20 deletions(-)

diff --git a/lib/cpumask_kunit.c b/lib/cpumask_kunit.c
index 4d353614d853..ecbeec72221e 100644
--- a/lib/cpumask_kunit.c
+++ b/lib/cpumask_kunit.c
@@ -9,6 +9,10 @@
 #include <linux/cpu.h>
 #include <linux/cpumask.h>
 
+#define MASK_MSG(m) \
+	"%s contains %sCPUs %*pbl", #m, (cpumask_weight(m) ? "" : "no "), \
+	nr_cpumask_bits, cpumask_bits(m)
+
 #define EXPECT_FOR_EACH_CPU_EQ(test, mask)			\
 	do {							\
 		const cpumask_t *m = (mask);			\
@@ -16,7 +20,7 @@
 		int cpu, iter = 0;				\
 		for_each_cpu(cpu, m)				\
 			iter++;					\
-		KUNIT_EXPECT_EQ((test), mask_weight, iter);	\
+		KUNIT_EXPECT_EQ_MSG((test), mask_weight, iter, MASK_MSG(mask));	\
 	} while (0)
 
 #define EXPECT_FOR_EACH_CPU_NOT_EQ(test, mask)					\
@@ -26,7 +30,7 @@
 		int cpu, iter = 0;						\
 		for_each_cpu_not(cpu, m)					\
 			iter++;							\
-		KUNIT_EXPECT_EQ((test), nr_cpu_ids - mask_weight, iter);	\
+		KUNIT_EXPECT_EQ_MSG((test), nr_cpu_ids - mask_weight, iter, MASK_MSG(mask));	\
 	} while (0)
 
 #define EXPECT_FOR_EACH_CPU_WRAP_EQ(test, mask)			\
@@ -36,7 +40,7 @@
 		int cpu, iter = 0;				\
 		for_each_cpu_wrap(cpu, m, nr_cpu_ids / 2)	\
 			iter++;					\
-		KUNIT_EXPECT_EQ((test), mask_weight, iter);	\
+		KUNIT_EXPECT_EQ_MSG((test), mask_weight, iter, MASK_MSG(mask));	\
 	} while (0)
 
 #define EXPECT_FOR_EACH_CPU_BUILTIN_EQ(test, name)		\
@@ -45,7 +49,7 @@
 		int cpu, iter = 0;				\
 		for_each_##name##_cpu(cpu)			\
 			iter++;					\
-		KUNIT_EXPECT_EQ((test), mask_weight, iter);	\
+		KUNIT_EXPECT_EQ_MSG((test), mask_weight, iter, MASK_MSG(cpu_##name##_mask));	\
 	} while (0)
 
 static cpumask_t mask_empty;
@@ -53,36 +57,43 @@ static cpumask_t mask_all;
 
 static void test_cpumask_weight(struct kunit *test)
 {
-	KUNIT_EXPECT_TRUE(test, cpumask_empty(&mask_empty));
-	KUNIT_EXPECT_TRUE(test, cpumask_full(&mask_all));
+	KUNIT_EXPECT_TRUE_MSG(test, cpumask_empty(&mask_empty), MASK_MSG(&mask_empty));
+	KUNIT_EXPECT_TRUE_MSG(test, cpumask_full(&mask_all), MASK_MSG(&mask_all));
 
-	KUNIT_EXPECT_EQ(test, 0, cpumask_weight(&mask_empty));
-	KUNIT_EXPECT_EQ(test, nr_cpu_ids, cpumask_weight(cpu_possible_mask));
-	KUNIT_EXPECT_EQ(test, nr_cpumask_bits, cpumask_weight(&mask_all));
+	KUNIT_EXPECT_EQ_MSG(test, 0, cpumask_weight(&mask_empty), MASK_MSG(&mask_empty));
+	KUNIT_EXPECT_EQ_MSG(test, nr_cpu_ids, cpumask_weight(cpu_possible_mask),
+			    MASK_MSG(cpu_possible_mask));
+	KUNIT_EXPECT_EQ_MSG(test, nr_cpumask_bits, cpumask_weight(&mask_all), MASK_MSG(&mask_all));
 }
 
 static void test_cpumask_first(struct kunit *test)
 {
-	KUNIT_EXPECT_LE(test, nr_cpu_ids, cpumask_first(&mask_empty));
-	KUNIT_EXPECT_EQ(test, 0, cpumask_first(cpu_possible_mask));
+	KUNIT_EXPECT_LE_MSG(test, nr_cpu_ids, cpumask_first(&mask_empty), MASK_MSG(&mask_empty));
+	KUNIT_EXPECT_EQ_MSG(test, 0, cpumask_first(cpu_possible_mask), MASK_MSG(cpu_possible_mask));
 
-	KUNIT_EXPECT_EQ(test, 0, cpumask_first_zero(&mask_empty));
-	KUNIT_EXPECT_LE(test, nr_cpu_ids, cpumask_first_zero(cpu_possible_mask));
+	KUNIT_EXPECT_EQ_MSG(test, 0, cpumask_first_zero(&mask_empty), MASK_MSG(&mask_empty));
+	KUNIT_EXPECT_LE_MSG(test, nr_cpu_ids, cpumask_first_zero(cpu_possible_mask),
+			    MASK_MSG(cpu_possible_mask));
 }
 
 static void test_cpumask_last(struct kunit *test)
 {
-	KUNIT_EXPECT_LE(test, nr_cpumask_bits, cpumask_last(&mask_empty));
-	KUNIT_EXPECT_EQ(test, nr_cpu_ids - 1, cpumask_last(cpu_possible_mask));
+	KUNIT_EXPECT_LE_MSG(test, nr_cpumask_bits, cpumask_last(&mask_empty),
+			    MASK_MSG(&mask_empty));
+	KUNIT_EXPECT_EQ_MSG(test, nr_cpu_ids - 1, cpumask_last(cpu_possible_mask),
+			    MASK_MSG(cpu_possible_mask));
 }
 
 static void test_cpumask_next(struct kunit *test)
 {
-	KUNIT_EXPECT_EQ(test, 0, cpumask_next_zero(-1, &mask_empty));
-	KUNIT_EXPECT_LE(test, nr_cpu_ids, cpumask_next_zero(-1, cpu_possible_mask));
-
-	KUNIT_EXPECT_LE(test, nr_cpu_ids, cpumask_next(-1, &mask_empty));
-	KUNIT_EXPECT_EQ(test, 0, cpumask_next(-1, cpu_possible_mask));
+	KUNIT_EXPECT_EQ_MSG(test, 0, cpumask_next_zero(-1, &mask_empty), MASK_MSG(&mask_empty));
+	KUNIT_EXPECT_LE_MSG(test, nr_cpu_ids, cpumask_next_zero(-1, cpu_possible_mask),
+			    MASK_MSG(cpu_possible_mask));
+
+	KUNIT_EXPECT_LE_MSG(test, nr_cpu_ids, cpumask_next(-1, &mask_empty),
+			    MASK_MSG(&mask_empty));
+	KUNIT_EXPECT_EQ_MSG(test, 0, cpumask_next(-1, cpu_possible_mask),
+			    MASK_MSG(cpu_possible_mask));
 }
 
 static void test_cpumask_iterators(struct kunit *test)
-- 
2.37.2