bitmap fixes for v6.0-rc3

Hi Linus,
 
 Please pull (hopefully) the last portion of fixes from Sander for his
 UP rework series. The original series came from -mm tree, and it was
 not the latest version, that's why we need follow-ups. It fixes only
 a test introduced by that series. The test fails under certain configs.
 
 From Sander:
 
 This series fixes the reported issues, and implements the suggested
 improvements, for the version of the cpumask tests [1] that was merged
 with commit c41e8866c2 ("lib/test: introduce cpumask KUnit test
 suite").
 
 These changes include fixes for the tests, and better alignment with the
 KUnit style guidelines.
 
 Thanks,
 Yury
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Merge tag 'bitmap-6.0-rc3' of github.com:/norov/linux

Pull bitmap fixes from Yury Norov:
 "Fix the reported issues, and implements the suggested improvements,
  for the version of the cpumask tests [1] that was merged with commit
  c41e8866c2 ("lib/test: introduce cpumask KUnit test suite").

  These changes include fixes for the tests, and better alignment with
  the KUnit style guidelines"

* tag 'bitmap-6.0-rc3' of github.com:/norov/linux:
  lib/cpumask_kunit: add tests file to MAINTAINERS
  lib/cpumask_kunit: log mask contents
  lib/test_cpumask: follow KUnit style guidelines
  lib/test_cpumask: fix cpu_possible_mask last test
  lib/test_cpumask: drop cpu_possible_mask full test

MAINTAINERS

@@ -3612,6 +3612,7 @@ F:	include/linux/find.h
 F:	include/linux/nodemask.h
 F:	lib/bitmap.c
 F:	lib/cpumask.c
+F:	lib/cpumask_kunit.c
 F:	lib/find_bit.c
 F:	lib/find_bit_benchmark.c
 F:	lib/test_bitmap.c

lib/Kconfig.debug

@@ -2029,13 +2029,16 @@ config LKDTM
 	Documentation on how to use the module can be found in
 	Documentation/fault-injection/provoke-crashes.rst
 
-config TEST_CPUMASK
+config CPUMASK_KUNIT_TEST
-	tristate "cpumask tests" if !KUNIT_ALL_TESTS
+	tristate "KUnit test for cpumask" if !KUNIT_ALL_TESTS
 	depends on KUNIT
 	default KUNIT_ALL_TESTS
 	help
 	  Enable to turn on cpumask tests, running at boot or module load time.
 
+	  For more information on KUnit and unit tests in general, please refer
+	  to the KUnit documentation in Documentation/dev-tools/kunit/.
+
 	  If unsure, say N.
 
 config TEST_LIST_SORT

lib/Makefile

@@ -60,6 +60,7 @@ obj-$(CONFIG_TEST_BPF) += test_bpf.o
 obj-$(CONFIG_TEST_FIRMWARE) += test_firmware.o
 obj-$(CONFIG_TEST_BITOPS) += test_bitops.o
 CFLAGS_test_bitops.o += -Werror
+obj-$(CONFIG_CPUMASK_KUNIT_TEST) += cpumask_kunit.o
 obj-$(CONFIG_TEST_SYSCTL) += test_sysctl.o
 obj-$(CONFIG_TEST_SIPHASH) += test_siphash.o
 obj-$(CONFIG_HASH_KUNIT_TEST) += test_hash.o
@@ -100,7 +101,6 @@ obj-$(CONFIG_TEST_HMM) += test_hmm.o
 obj-$(CONFIG_TEST_FREE_PAGES) += test_free_pages.o
 obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o
 obj-$(CONFIG_TEST_REF_TRACKER) += test_ref_tracker.o
-obj-$(CONFIG_TEST_CPUMASK) += test_cpumask.o
 CFLAGS_test_fprobe.o += $(CC_FLAGS_FTRACE)
 obj-$(CONFIG_FPROBE_SANITY_TEST) += test_fprobe.o
 #

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;
@@ -53,37 +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_MSG(test, cpumask_empty(&mask_empty), MASK_MSG(&mask_empty));
-	KUNIT_EXPECT_TRUE(test, cpumask_full(cpu_possible_mask));
+	KUNIT_EXPECT_TRUE_MSG(test, cpumask_full(&mask_all), MASK_MSG(&mask_all));
-	KUNIT_EXPECT_TRUE(test, cpumask_full(&mask_all));
 
-	KUNIT_EXPECT_EQ(test, 0, cpumask_weight(&mask_empty));
+	KUNIT_EXPECT_EQ_MSG(test, 0, cpumask_weight(&mask_empty), MASK_MSG(&mask_empty));
-	KUNIT_EXPECT_EQ(test, nr_cpu_ids, cpumask_weight(cpu_possible_mask));
+	KUNIT_EXPECT_EQ_MSG(test, nr_cpu_ids, cpumask_weight(cpu_possible_mask),
-	KUNIT_EXPECT_EQ(test, nr_cpumask_bits, cpumask_weight(&mask_all));
+			    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_LE_MSG(test, nr_cpu_ids, cpumask_first(&mask_empty), MASK_MSG(&mask_empty));
-	KUNIT_EXPECT_EQ(test, 0, cpumask_first(cpu_possible_mask));
+	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_EQ_MSG(test, 0, cpumask_first_zero(&mask_empty), MASK_MSG(&mask_empty));
-	KUNIT_EXPECT_LE(test, nr_cpu_ids, cpumask_first_zero(cpu_possible_mask));
+	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_LE_MSG(test, nr_cpumask_bits, cpumask_last(&mask_empty),
-	KUNIT_EXPECT_EQ(test, nr_cpumask_bits - 1, cpumask_last(cpu_possible_mask));
+			    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_EQ_MSG(test, 0, cpumask_next_zero(-1, &mask_empty), MASK_MSG(&mask_empty));
-	KUNIT_EXPECT_LE(test, nr_cpu_ids, cpumask_next_zero(-1, cpu_possible_mask));
+	KUNIT_EXPECT_LE_MSG(test, nr_cpu_ids, cpumask_next_zero(-1, cpu_possible_mask),
+			    MASK_MSG(cpu_possible_mask));
 
-	KUNIT_EXPECT_LE(test, nr_cpu_ids, cpumask_next(-1, &mask_empty));
+	KUNIT_EXPECT_LE_MSG(test, nr_cpu_ids, cpumask_next(-1, &mask_empty),
-	KUNIT_EXPECT_EQ(test, 0, cpumask_next(-1, cpu_possible_mask));
+			    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)