[PATCH v2] lib/test: convert test_overflow.c to use KUnit

From: Daniel Latypov
Date: Tue May 11 2021 - 18:05:24 EST

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This largely consists of:
* replacing `err |= test_func(...)` calls with `test_func(test, ...)`.
* changing pr_warn to KUNIT_*_MSG() macros to mark the failed test
while printing a diagnostic message
* dropping __init as there are concerns of this causing issues w/ KUnit
when running on some other arches.

With the exception of now needing to set CONFIG_KUNIT=y, the test can
still be run as before, at boot time or as a test module.
But now the output of the test will be TAP (Test Anything Protocol),
the format used by kselftest instead of just warnings and printing
"FAIL!" , see [1].

But now the test can also be run more quickly via kunit.py

$ ./tools/testing/kunit/kunit.py run --kunitconfig /dev/stdin <<EOF
CONFIG_KUNIT=y
CONFIG_TEST_OVERFLOW=y
EOF

Note: after a mrproper this took
> Elapsed time: 38.683s total, 3.598s configuring, 32.141s building, 0.000s running

(Normally would be less clunky as you wouldn't use a heredoc).

[1] Here's an example failure message after tweaking the test array:
TAP version 14
1..1
# Subtest: lib_overflow
1..10
# test_u8_overflow: u8 : 18 arithmetic tests
# test_u8_overflow: EXPECTATION FAILED at lib/test_overflow.c:251
Expected _got == p->sum, but
_got == 0
p->sum == 1
wrong result for 0 + 0 (type u8)
...
not ok 1 - test_u8_overflow
# test_s8_overflow: s8 : 19 arithmetic tests
ok 2 - test_s8_overflow
...
# test_overflow_shift: ok: (s32)(0 << 31) == 0
# test_overflow_shift: ok: (s64)(0 << 63) == 0
ok 9 - test_overflow_shift

Signed-off-by: Daniel Latypov <dlatypov@xxxxxxxxxx>
Tested-by: David Gow <davidgow@xxxxxxxxxx>
--
v1 -> v2:
* Use kunit_info() instead of pr_info().
* means messages are printed prefixed with "# test_name: "
* Add in missing conversion to KUNIT_EXPECT_* macros
---
lib/Kconfig.debug | 4 +-
lib/test_overflow.c | 433 ++++++++++++++++++++------------------------
2 files changed, 196 insertions(+), 241 deletions(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 678c13967580..8e19ba9ac22c 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2195,7 +2195,9 @@ config TEST_XARRAY
tristate "Test the XArray code at runtime"

config TEST_OVERFLOW
- tristate "Test check_*_overflow() functions at runtime"
+ tristate "Test check_*_overflow() functions at runtime" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS

config TEST_RHASHTABLE
tristate "Perform selftest on resizable hash table"
diff --git a/lib/test_overflow.c b/lib/test_overflow.c
index 7a4b6f6c5473..098339251908 100644
--- a/lib/test_overflow.c
+++ b/lib/test_overflow.c
@@ -2,10 +2,9 @@
/*
* Test cases for arithmetic overflow checks.
*/
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <kunit/test.h>

#include <linux/device.h>
-#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
@@ -19,7 +18,7 @@
t a, b; \
t sum, diff, prod; \
bool s_of, d_of, p_of; \
- } t ## _tests[] __initconst
+ } t ## _tests[]

DEFINE_TEST_ARRAY(u8) = {
{0, 0, 0, 0, 0, false, false, false},
@@ -215,48 +214,38 @@ DEFINE_TEST_ARRAY(s64) = {
{0, -S64_MAX, -S64_MAX, S64_MAX, 0, false, false, false},
};

-#define check_one_op(t, fmt, op, sym, a, b, r, of) do { \
- t _r; \
- bool _of; \
- \
- _of = check_ ## op ## _overflow(a, b, &_r); \
- if (_of != of) { \
- pr_warn("expected "fmt" "sym" "fmt \
- " to%s overflow (type %s)\n", \
- a, b, of ? "" : " not", #t); \
- err = 1; \
- } \
- if (_r != r) { \
- pr_warn("expected "fmt" "sym" "fmt" == " \
- fmt", got "fmt" (type %s)\n", \
- a, b, r, _r, #t); \
- err = 1; \
- } \
+#define check_one_op(t, fmt, op, sym, a, b, want, of) do { \
+ t _got; \
+ bool _of; \
+ \
+ _of = check_ ## op ## _overflow(a, b, &_got); \
+ KUNIT_EXPECT_EQ_MSG(test, _of, of, \
+ "expected " fmt " " sym " " fmt " to%s overflow " \
+ "(type %s)", a, b, of ? "" : " not", #t); \
+ \
+ KUNIT_EXPECT_EQ_MSG(test, _got, want, \
+ "wrong result for " fmt " " sym " " fmt " (type %s)", \
+ a, b, #t); \
} while (0)

#define DEFINE_TEST_FUNC(t, fmt) \
-static int __init do_test_ ## t(const struct test_ ## t *p) \
-{ \
- int err = 0; \
- \
+static void do_test_ ## t(struct kunit *test, const struct test_ ## t *p)\
+{ \
check_one_op(t, fmt, add, "+", p->a, p->b, p->sum, p->s_of); \
check_one_op(t, fmt, add, "+", p->b, p->a, p->sum, p->s_of); \
check_one_op(t, fmt, sub, "-", p->a, p->b, p->diff, p->d_of); \
check_one_op(t, fmt, mul, "*", p->a, p->b, p->prod, p->p_of); \
check_one_op(t, fmt, mul, "*", p->b, p->a, p->prod, p->p_of); \
- \
- return err; \
} \
\
-static int __init test_ ## t ## _overflow(void) { \
- int err = 0; \
+static void test_ ## t ## _overflow(struct kunit *test) \
+{ \
unsigned i; \
\
- pr_info("%-3s: %zu arithmetic tests\n", #t, \
- ARRAY_SIZE(t ## _tests)); \
+ kunit_info(test, "%-3s: %zu arithmetic tests\n", #t, \
+ ARRAY_SIZE(t ## _tests)); \
for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i) \
- err |= do_test_ ## t(&t ## _tests[i]); \
- return err; \
+ do_test_ ## t(test, &t ## _tests[i]); \
}

DEFINE_TEST_FUNC(u8, "%d");
@@ -270,199 +259,174 @@ DEFINE_TEST_FUNC(u64, "%llu");
DEFINE_TEST_FUNC(s64, "%lld");
#endif

-static int __init test_overflow_calculation(void)
+static void test_overflow_shift(struct kunit *test)
{
- int err = 0;
-
- err |= test_u8_overflow();
- err |= test_s8_overflow();
- err |= test_u16_overflow();
- err |= test_s16_overflow();
- err |= test_u32_overflow();
- err |= test_s32_overflow();
-#if BITS_PER_LONG == 64
- err |= test_u64_overflow();
- err |= test_s64_overflow();
-#endif
-
- return err;
-}
-
-static int __init test_overflow_shift(void)
-{
- int err = 0;
-
/* Args are: value, shift, type, expected result, overflow expected */
-#define TEST_ONE_SHIFT(a, s, t, expect, of) ({ \
+#define TEST_ONE_SHIFT(a, s, t, expect, of) do { \
int __failed = 0; \
typeof(a) __a = (a); \
typeof(s) __s = (s); \
- t __e = (expect); \
- t __d; \
- bool __of = check_shl_overflow(__a, __s, &__d); \
+ t __want = (expect); \
+ t __got; \
+ bool __of = check_shl_overflow(__a, __s, &__got); \
if (__of != of) { \
- pr_warn("expected (%s)(%s << %s) to%s overflow\n", \
- #t, #a, #s, of ? "" : " not"); \
+ KUNIT_FAIL(test, "expected (%s)(%s << %s) to%s overflow"\
+ #t, #a, #s, of ? "" : " not"); \
__failed = 1; \
- } else if (!__of && __d != __e) { \
- pr_warn("expected (%s)(%s << %s) == %s\n", \
+ } else if (!__of && __got != __want) { \
+ KUNIT_EXPECT_EQ_MSG(test, __got, __want, \
+ "expected (%s)(%s << %s) == %s", \
#t, #a, #s, #expect); \
- if ((t)-1 < 0) \
- pr_warn("got %lld\n", (s64)__d); \
- else \
- pr_warn("got %llu\n", (u64)__d); \
__failed = 1; \
} \
if (!__failed) \
- pr_info("ok: (%s)(%s << %s) == %s\n", #t, #a, #s, \
- of ? "overflow" : #expect); \
- __failed; \
-})
+ kunit_info(test, "ok: (%s)(%s << %s) == %s\n", #t, #a, \
+ #s, of ? "overflow" : #expect); \
+} while (0)

/* Sane shifts. */
- err |= TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false);
- err |= TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false);
- err |= TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false);
- err |= TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false);
- err |= TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false);
- err |= TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false);
- err |= TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false);
- err |= TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false);
- err |= TEST_ONE_SHIFT(1, 0, int, 1 << 0, false);
- err |= TEST_ONE_SHIFT(1, 16, int, 1 << 16, false);
- err |= TEST_ONE_SHIFT(1, 30, int, 1 << 30, false);
- err |= TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false);
- err |= TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false);
- err |= TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false);
- err |= TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false);
- err |= TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false);
- err |= TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false);
- err |= TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false);
- err |= TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false);
- err |= TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false);
- err |= TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false);
- err |= TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false);
- err |= TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false);
- err |= TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false);
- err |= TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false);
- err |= TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64,
- 0xFFFFFFFFULL << 32, false);
+ TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false);
+ TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false);
+ TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false);
+ TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false);
+ TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false);
+ TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false);
+ TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false);
+ TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false);
+ TEST_ONE_SHIFT(1, 0, int, 1 << 0, false);
+ TEST_ONE_SHIFT(1, 16, int, 1 << 16, false);
+ TEST_ONE_SHIFT(1, 30, int, 1 << 30, false);
+ TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false);
+ TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false);
+ TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false);
+ TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false);
+ TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false);
+ TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false);
+ TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false);
+ TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false);
+ TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false);
+ TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false);
+ TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false);
+ TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false);
+ TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false);
+ TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false);
+ TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64, 0xFFFFFFFFULL << 32, false);

/* Sane shift: start and end with 0, without a too-wide shift. */
- err |= TEST_ONE_SHIFT(0, 7, u8, 0, false);
- err |= TEST_ONE_SHIFT(0, 15, u16, 0, false);
- err |= TEST_ONE_SHIFT(0, 31, unsigned int, 0, false);
- err |= TEST_ONE_SHIFT(0, 31, u32, 0, false);
- err |= TEST_ONE_SHIFT(0, 63, u64, 0, false);
+ TEST_ONE_SHIFT(0, 7, u8, 0, false);
+ TEST_ONE_SHIFT(0, 15, u16, 0, false);
+ TEST_ONE_SHIFT(0, 31, unsigned int, 0, false);
+ TEST_ONE_SHIFT(0, 31, u32, 0, false);
+ TEST_ONE_SHIFT(0, 63, u64, 0, false);

/* Sane shift: start and end with 0, without reaching signed bit. */
- err |= TEST_ONE_SHIFT(0, 6, s8, 0, false);
- err |= TEST_ONE_SHIFT(0, 14, s16, 0, false);
- err |= TEST_ONE_SHIFT(0, 30, int, 0, false);
- err |= TEST_ONE_SHIFT(0, 30, s32, 0, false);
- err |= TEST_ONE_SHIFT(0, 62, s64, 0, false);
+ TEST_ONE_SHIFT(0, 6, s8, 0, false);
+ TEST_ONE_SHIFT(0, 14, s16, 0, false);
+ TEST_ONE_SHIFT(0, 30, int, 0, false);
+ TEST_ONE_SHIFT(0, 30, s32, 0, false);
+ TEST_ONE_SHIFT(0, 62, s64, 0, false);

/* Overflow: shifted the bit off the end. */
- err |= TEST_ONE_SHIFT(1, 8, u8, 0, true);
- err |= TEST_ONE_SHIFT(1, 16, u16, 0, true);
- err |= TEST_ONE_SHIFT(1, 32, unsigned int, 0, true);
- err |= TEST_ONE_SHIFT(1, 32, u32, 0, true);
- err |= TEST_ONE_SHIFT(1, 64, u64, 0, true);
+ TEST_ONE_SHIFT(1, 8, u8, 0, true);
+ TEST_ONE_SHIFT(1, 16, u16, 0, true);
+ TEST_ONE_SHIFT(1, 32, unsigned int, 0, true);
+ TEST_ONE_SHIFT(1, 32, u32, 0, true);
+ TEST_ONE_SHIFT(1, 64, u64, 0, true);

/* Overflow: shifted into the signed bit. */
- err |= TEST_ONE_SHIFT(1, 7, s8, 0, true);
- err |= TEST_ONE_SHIFT(1, 15, s16, 0, true);
- err |= TEST_ONE_SHIFT(1, 31, int, 0, true);
- err |= TEST_ONE_SHIFT(1, 31, s32, 0, true);
- err |= TEST_ONE_SHIFT(1, 63, s64, 0, true);
+ TEST_ONE_SHIFT(1, 7, s8, 0, true);
+ TEST_ONE_SHIFT(1, 15, s16, 0, true);
+ TEST_ONE_SHIFT(1, 31, int, 0, true);
+ TEST_ONE_SHIFT(1, 31, s32, 0, true);
+ TEST_ONE_SHIFT(1, 63, s64, 0, true);

/* Overflow: high bit falls off unsigned types. */
/* 10010110 */
- err |= TEST_ONE_SHIFT(150, 1, u8, 0, true);
+ TEST_ONE_SHIFT(150, 1, u8, 0, true);
/* 1000100010010110 */
- err |= TEST_ONE_SHIFT(34966, 1, u16, 0, true);
+ TEST_ONE_SHIFT(34966, 1, u16, 0, true);
/* 10000100000010001000100010010110 */
- err |= TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true);
- err |= TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true);
+ TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true);
+ TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true);
/* 1000001000010000010000000100000010000100000010001000100010010110 */
- err |= TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true);
+ TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true);

/* Overflow: bit shifted into signed bit on signed types. */
/* 01001011 */
- err |= TEST_ONE_SHIFT(75, 1, s8, 0, true);
+ TEST_ONE_SHIFT(75, 1, s8, 0, true);
/* 0100010001001011 */
- err |= TEST_ONE_SHIFT(17483, 1, s16, 0, true);
+ TEST_ONE_SHIFT(17483, 1, s16, 0, true);
/* 01000010000001000100010001001011 */
- err |= TEST_ONE_SHIFT(1107575883, 1, s32, 0, true);
- err |= TEST_ONE_SHIFT(1107575883, 1, int, 0, true);
+ TEST_ONE_SHIFT(1107575883, 1, s32, 0, true);
+ TEST_ONE_SHIFT(1107575883, 1, int, 0, true);
/* 0100000100001000001000000010000001000010000001000100010001001011 */
- err |= TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true);
+ TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true);

/* Overflow: bit shifted past signed bit on signed types. */
/* 01001011 */
- err |= TEST_ONE_SHIFT(75, 2, s8, 0, true);
+ TEST_ONE_SHIFT(75, 2, s8, 0, true);
/* 0100010001001011 */
- err |= TEST_ONE_SHIFT(17483, 2, s16, 0, true);
+ TEST_ONE_SHIFT(17483, 2, s16, 0, true);
/* 01000010000001000100010001001011 */
- err |= TEST_ONE_SHIFT(1107575883, 2, s32, 0, true);
- err |= TEST_ONE_SHIFT(1107575883, 2, int, 0, true);
+ TEST_ONE_SHIFT(1107575883, 2, s32, 0, true);
+ TEST_ONE_SHIFT(1107575883, 2, int, 0, true);
/* 0100000100001000001000000010000001000010000001000100010001001011 */
- err |= TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true);
+ TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true);

/* Overflow: values larger than destination type. */
- err |= TEST_ONE_SHIFT(0x100, 0, u8, 0, true);
- err |= TEST_ONE_SHIFT(0xFF, 0, s8, 0, true);
- err |= TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true);
- err |= TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true);
- err |= TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true);
- err |= TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true);
- err |= TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true);
- err |= TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true);
- err |= TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true);
+ TEST_ONE_SHIFT(0x100, 0, u8, 0, true);
+ TEST_ONE_SHIFT(0xFF, 0, s8, 0, true);
+ TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true);
+ TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true);
+ TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true);
+ TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true);
+ TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true);
+ TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true);
+ TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true);

/* Nonsense: negative initial value. */
- err |= TEST_ONE_SHIFT(-1, 0, s8, 0, true);
- err |= TEST_ONE_SHIFT(-1, 0, u8, 0, true);
- err |= TEST_ONE_SHIFT(-5, 0, s16, 0, true);
- err |= TEST_ONE_SHIFT(-5, 0, u16, 0, true);
- err |= TEST_ONE_SHIFT(-10, 0, int, 0, true);
- err |= TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true);
- err |= TEST_ONE_SHIFT(-100, 0, s32, 0, true);
- err |= TEST_ONE_SHIFT(-100, 0, u32, 0, true);
- err |= TEST_ONE_SHIFT(-10000, 0, s64, 0, true);
- err |= TEST_ONE_SHIFT(-10000, 0, u64, 0, true);
+ TEST_ONE_SHIFT(-1, 0, s8, 0, true);
+ TEST_ONE_SHIFT(-1, 0, u8, 0, true);
+ TEST_ONE_SHIFT(-5, 0, s16, 0, true);
+ TEST_ONE_SHIFT(-5, 0, u16, 0, true);
+ TEST_ONE_SHIFT(-10, 0, int, 0, true);
+ TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true);
+ TEST_ONE_SHIFT(-100, 0, s32, 0, true);
+ TEST_ONE_SHIFT(-100, 0, u32, 0, true);
+ TEST_ONE_SHIFT(-10000, 0, s64, 0, true);
+ TEST_ONE_SHIFT(-10000, 0, u64, 0, true);

/* Nonsense: negative shift values. */
- err |= TEST_ONE_SHIFT(0, -5, s8, 0, true);
- err |= TEST_ONE_SHIFT(0, -5, u8, 0, true);
- err |= TEST_ONE_SHIFT(0, -10, s16, 0, true);
- err |= TEST_ONE_SHIFT(0, -10, u16, 0, true);
- err |= TEST_ONE_SHIFT(0, -15, int, 0, true);
- err |= TEST_ONE_SHIFT(0, -15, unsigned int, 0, true);
- err |= TEST_ONE_SHIFT(0, -20, s32, 0, true);
- err |= TEST_ONE_SHIFT(0, -20, u32, 0, true);
- err |= TEST_ONE_SHIFT(0, -30, s64, 0, true);
- err |= TEST_ONE_SHIFT(0, -30, u64, 0, true);
+ TEST_ONE_SHIFT(0, -5, s8, 0, true);
+ TEST_ONE_SHIFT(0, -5, u8, 0, true);
+ TEST_ONE_SHIFT(0, -10, s16, 0, true);
+ TEST_ONE_SHIFT(0, -10, u16, 0, true);
+ TEST_ONE_SHIFT(0, -15, int, 0, true);
+ TEST_ONE_SHIFT(0, -15, unsigned int, 0, true);
+ TEST_ONE_SHIFT(0, -20, s32, 0, true);
+ TEST_ONE_SHIFT(0, -20, u32, 0, true);
+ TEST_ONE_SHIFT(0, -30, s64, 0, true);
+ TEST_ONE_SHIFT(0, -30, u64, 0, true);

/* Overflow: shifted at or beyond entire type's bit width. */
- err |= TEST_ONE_SHIFT(0, 8, u8, 0, true);
- err |= TEST_ONE_SHIFT(0, 9, u8, 0, true);
- err |= TEST_ONE_SHIFT(0, 8, s8, 0, true);
- err |= TEST_ONE_SHIFT(0, 9, s8, 0, true);
- err |= TEST_ONE_SHIFT(0, 16, u16, 0, true);
- err |= TEST_ONE_SHIFT(0, 17, u16, 0, true);
- err |= TEST_ONE_SHIFT(0, 16, s16, 0, true);
- err |= TEST_ONE_SHIFT(0, 17, s16, 0, true);
- err |= TEST_ONE_SHIFT(0, 32, u32, 0, true);
- err |= TEST_ONE_SHIFT(0, 33, u32, 0, true);
- err |= TEST_ONE_SHIFT(0, 32, int, 0, true);
- err |= TEST_ONE_SHIFT(0, 33, int, 0, true);
- err |= TEST_ONE_SHIFT(0, 32, s32, 0, true);
- err |= TEST_ONE_SHIFT(0, 33, s32, 0, true);
- err |= TEST_ONE_SHIFT(0, 64, u64, 0, true);
- err |= TEST_ONE_SHIFT(0, 65, u64, 0, true);
- err |= TEST_ONE_SHIFT(0, 64, s64, 0, true);
- err |= TEST_ONE_SHIFT(0, 65, s64, 0, true);
+ TEST_ONE_SHIFT(0, 8, u8, 0, true);
+ TEST_ONE_SHIFT(0, 9, u8, 0, true);
+ TEST_ONE_SHIFT(0, 8, s8, 0, true);
+ TEST_ONE_SHIFT(0, 9, s8, 0, true);
+ TEST_ONE_SHIFT(0, 16, u16, 0, true);
+ TEST_ONE_SHIFT(0, 17, u16, 0, true);
+ TEST_ONE_SHIFT(0, 16, s16, 0, true);
+ TEST_ONE_SHIFT(0, 17, s16, 0, true);
+ TEST_ONE_SHIFT(0, 32, u32, 0, true);
+ TEST_ONE_SHIFT(0, 33, u32, 0, true);
+ TEST_ONE_SHIFT(0, 32, int, 0, true);
+ TEST_ONE_SHIFT(0, 33, int, 0, true);
+ TEST_ONE_SHIFT(0, 32, s32, 0, true);
+ TEST_ONE_SHIFT(0, 33, s32, 0, true);
+ TEST_ONE_SHIFT(0, 64, u64, 0, true);
+ TEST_ONE_SHIFT(0, 65, u64, 0, true);
+ TEST_ONE_SHIFT(0, 64, s64, 0, true);
+ TEST_ONE_SHIFT(0, 65, s64, 0, true);

/*
* Corner case: for unsigned types, we fail when we've shifted
@@ -473,13 +437,11 @@ static int __init test_overflow_shift(void)
* signed bit). So, for now, we will test this condition but
* mark it as not expected to overflow.
*/
- err |= TEST_ONE_SHIFT(0, 7, s8, 0, false);
- err |= TEST_ONE_SHIFT(0, 15, s16, 0, false);
- err |= TEST_ONE_SHIFT(0, 31, int, 0, false);
- err |= TEST_ONE_SHIFT(0, 31, s32, 0, false);
- err |= TEST_ONE_SHIFT(0, 63, s64, 0, false);
-
- return err;
+ TEST_ONE_SHIFT(0, 7, s8, 0, false);
+ TEST_ONE_SHIFT(0, 15, s16, 0, false);
+ TEST_ONE_SHIFT(0, 31, int, 0, false);
+ TEST_ONE_SHIFT(0, 31, s32, 0, false);
+ TEST_ONE_SHIFT(0, 63, s64, 0, false);
}

/*
@@ -499,7 +461,7 @@ static int __init test_overflow_shift(void)
#define TEST_SIZE (5 * 4096)

#define DEFINE_TEST_ALLOC(func, free_func, want_arg, want_gfp, want_node)\
-static int __init test_ ## func (void *arg) \
+static void test_ ## func (struct kunit *test, void *arg) \
{ \
volatile size_t a = TEST_SIZE; \
volatile size_t b = (SIZE_MAX / TEST_SIZE) + 1; \
@@ -507,31 +469,26 @@ static int __init test_ ## func (void *arg) \
\
/* Tiny allocation test. */ \
ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, 1);\
- if (!ptr) { \
- pr_warn(#func " failed regular allocation?!\n"); \
- return 1; \
- } \
+ KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \
+ #func " failed regular allocation?!"); \
free ## want_arg (free_func, arg, ptr); \
\
/* Wrapped allocation test. */ \
ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \
a * b); \
- if (!ptr) { \
- pr_warn(#func " unexpectedly failed bad wrapping?!\n"); \
- return 1; \
- } \
+ KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \
+ #func " unexpectedly failed bad wrapping?!"); \
free ## want_arg (free_func, arg, ptr); \
\
/* Saturated allocation test. */ \
ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \
array_size(a, b)); \
if (ptr) { \
- pr_warn(#func " missed saturation!\n"); \
+ KUNIT_FAIL(test, #func " missed saturation!\n"); \
free ## want_arg (free_func, arg, ptr); \
- return 1; \
+ return; \
} \
- pr_info(#func " detected saturation\n"); \
- return 0; \
+ kunit_info(test, #func " detected saturation\n"); \
}

/*
@@ -555,60 +512,56 @@ DEFINE_TEST_ALLOC(kvzalloc_node, kvfree, 0, 1, 1);
DEFINE_TEST_ALLOC(devm_kmalloc, devm_kfree, 1, 1, 0);
DEFINE_TEST_ALLOC(devm_kzalloc, devm_kfree, 1, 1, 0);

-static int __init test_overflow_allocation(void)
+static void test_overflow_allocation(struct kunit *test)
{
const char device_name[] = "overflow-test";
struct device *dev;
- int err = 0;

/* Create dummy device for devm_kmalloc()-family tests. */
dev = root_device_register(device_name);
- if (IS_ERR(dev)) {
- pr_warn("Cannot register test device\n");
- return 1;
- }
-
- err |= test_kmalloc(NULL);
- err |= test_kmalloc_node(NULL);
- err |= test_kzalloc(NULL);
- err |= test_kzalloc_node(NULL);
- err |= test_kvmalloc(NULL);
- err |= test_kvmalloc_node(NULL);
- err |= test_kvzalloc(NULL);
- err |= test_kvzalloc_node(NULL);
- err |= test_vmalloc(NULL);
- err |= test_vmalloc_node(NULL);
- err |= test_vzalloc(NULL);
- err |= test_vzalloc_node(NULL);
- err |= test_devm_kmalloc(dev);
- err |= test_devm_kzalloc(dev);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, dev,
+ "Cannot register test device");
+
+ test_kmalloc(test, NULL);
+ test_kmalloc_node(test, NULL);
+ test_kzalloc(test, NULL);
+ test_kzalloc_node(test, NULL);
+ test_kvmalloc(test, NULL);
+ test_kvmalloc_node(test, NULL);
+ test_kvzalloc(test, NULL);
+ test_kvzalloc_node(test, NULL);
+ test_vmalloc(test, NULL);
+ test_vmalloc_node(test, NULL);
+ test_vzalloc(test, NULL);
+ test_vzalloc_node(test, NULL);
+ test_devm_kmalloc(test, dev);
+ test_devm_kzalloc(test, dev);

device_unregister(dev);
-
- return err;
}

-static int __init test_module_init(void)
-{
- int err = 0;
-
- err |= test_overflow_calculation();
- err |= test_overflow_shift();
- err |= test_overflow_allocation();
+static struct kunit_case overflow_test_cases[] = {
+ KUNIT_CASE(test_u8_overflow),
+ KUNIT_CASE(test_s8_overflow),
+ KUNIT_CASE(test_u16_overflow),
+ KUNIT_CASE(test_s16_overflow),
+ KUNIT_CASE(test_u32_overflow),
+ KUNIT_CASE(test_s32_overflow),
+#if BITS_PER_LONG == 64
+ KUNIT_CASE(test_u64_overflow),
+ KUNIT_CASE(test_s64_overflow),
+#endif

- if (err) {
- pr_warn("FAIL!\n");
- err = -EINVAL;
- } else {
- pr_info("all tests passed\n");
- }
+ KUNIT_CASE(test_overflow_shift),
+ KUNIT_CASE(test_overflow_allocation),
+ {}
+};

- return err;
-}
+static struct kunit_suite overflow_test_suite = {
+ .name = "lib_overflow",
+ .test_cases = overflow_test_cases,
+};

-static void __exit test_module_exit(void)
-{ }
+kunit_test_suites(&overflow_test_suite);

-module_init(test_module_init);
-module_exit(test_module_exit);
MODULE_LICENSE("Dual MIT/GPL");

base-commit: 88b06399c9c766c283e070b022b5ceafa4f63f19
--
2.31.1.607.g51e8a6a459-goog

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