[PATCH v2 1/2] printf: convert self-test to KUnit

From: Tamir Duberstein
Date: Fri Feb 07 2025 - 06:32:03 EST

Convert the printf() self-test to a KUnit test.

In the interest of keeping the patch reasonably-sized this doesn't
refactor the tests into proper parameterized tests - it's all one big
test case.

Acked-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> # m68k
Signed-off-by: Tamir Duberstein <tamird@xxxxxxxxx>
---
Documentation/core-api/printk-formats.rst | 2 +-
MAINTAINERS | 2 +-
arch/m68k/configs/amiga_defconfig | 1 -
arch/m68k/configs/apollo_defconfig | 1 -
arch/m68k/configs/atari_defconfig | 1 -
arch/m68k/configs/bvme6000_defconfig | 1 -
arch/m68k/configs/hp300_defconfig | 1 -
arch/m68k/configs/mac_defconfig | 1 -
arch/m68k/configs/multi_defconfig | 1 -
arch/m68k/configs/mvme147_defconfig | 1 -
arch/m68k/configs/mvme16x_defconfig | 1 -
arch/m68k/configs/q40_defconfig | 1 -
arch/m68k/configs/sun3_defconfig | 1 -
arch/m68k/configs/sun3x_defconfig | 1 -
arch/powerpc/configs/ppc64_defconfig | 1 -
lib/Kconfig.debug | 20 +++-
lib/Makefile | 2 +-
lib/{test_printf.c => printf_kunit.c} | 164 +++++++++++++++---------------
tools/testing/selftests/lib/config | 1 -
tools/testing/selftests/lib/printf.sh | 4 -
20 files changed, 104 insertions(+), 104 deletions(-)

diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
index ecccc0473da9..0d9461bd6964 100644
--- a/Documentation/core-api/printk-formats.rst
+++ b/Documentation/core-api/printk-formats.rst
@@ -661,7 +661,7 @@ Do *not* use it from C.
Thanks
======

-If you add other %p extensions, please extend <lib/test_printf.c> with
+If you add other %p extensions, please extend <lib/printf_kunit.c> with
one or more test cases, if at all feasible.

Thank you for your cooperation and attention.
diff --git a/MAINTAINERS b/MAINTAINERS
index 896a307fa065..57e366d356bd 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -25368,7 +25368,7 @@ R: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
S: Maintained
T: git git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux.git
F: Documentation/core-api/printk-formats.rst
-F: lib/test_printf.c
+F: lib/printf_kunit.c
F: lib/test_scanf.c
F: lib/vsprintf.c

diff --git a/arch/m68k/configs/amiga_defconfig b/arch/m68k/configs/amiga_defconfig
index dbf2ea561c85..e8c5e08fb6ec 100644
--- a/arch/m68k/configs/amiga_defconfig
+++ b/arch/m68k/configs/amiga_defconfig
@@ -622,7 +622,6 @@ CONFIG_ATOMIC64_SELFTEST=m
CONFIG_ASYNC_RAID6_TEST=m
CONFIG_TEST_HEXDUMP=m
CONFIG_TEST_KSTRTOX=m
-CONFIG_TEST_PRINTF=m
CONFIG_TEST_SCANF=m
CONFIG_TEST_BITMAP=m
CONFIG_TEST_UUID=m
diff --git a/arch/m68k/configs/apollo_defconfig b/arch/m68k/configs/apollo_defconfig
index b0fd199cc0a4..dcaddfc675de 100644
--- a/arch/m68k/configs/apollo_defconfig
+++ b/arch/m68k/configs/apollo_defconfig
@@ -579,7 +579,6 @@ CONFIG_ATOMIC64_SELFTEST=m
CONFIG_ASYNC_RAID6_TEST=m
CONFIG_TEST_HEXDUMP=m
CONFIG_TEST_KSTRTOX=m
-CONFIG_TEST_PRINTF=m
CONFIG_TEST_SCANF=m
CONFIG_TEST_BITMAP=m
CONFIG_TEST_UUID=m
diff --git a/arch/m68k/configs/atari_defconfig b/arch/m68k/configs/atari_defconfig
index bb5b2d3b6c10..53a91c62d415 100644
--- a/arch/m68k/configs/atari_defconfig
+++ b/arch/m68k/configs/atari_defconfig
@@ -599,7 +599,6 @@ CONFIG_ATOMIC64_SELFTEST=m
CONFIG_ASYNC_RAID6_TEST=m
CONFIG_TEST_HEXDUMP=m
CONFIG_TEST_KSTRTOX=m
-CONFIG_TEST_PRINTF=m
CONFIG_TEST_SCANF=m
CONFIG_TEST_BITMAP=m
CONFIG_TEST_UUID=m
diff --git a/arch/m68k/configs/bvme6000_defconfig b/arch/m68k/configs/bvme6000_defconfig
index 8315a13bab73..ea2f84907c4e 100644
--- a/arch/m68k/configs/bvme6000_defconfig
+++ b/arch/m68k/configs/bvme6000_defconfig
@@ -571,7 +571,6 @@ CONFIG_ATOMIC64_SELFTEST=m
CONFIG_ASYNC_RAID6_TEST=m
CONFIG_TEST_HEXDUMP=m
CONFIG_TEST_KSTRTOX=m
-CONFIG_TEST_PRINTF=m
CONFIG_TEST_SCANF=m
CONFIG_TEST_BITMAP=m
CONFIG_TEST_UUID=m
diff --git a/arch/m68k/configs/hp300_defconfig b/arch/m68k/configs/hp300_defconfig
index 350370657e5f..7b1cc9f597bf 100644
--- a/arch/m68k/configs/hp300_defconfig
+++ b/arch/m68k/configs/hp300_defconfig
@@ -581,7 +581,6 @@ CONFIG_ATOMIC64_SELFTEST=m
CONFIG_ASYNC_RAID6_TEST=m
CONFIG_TEST_HEXDUMP=m
CONFIG_TEST_KSTRTOX=m
-CONFIG_TEST_PRINTF=m
CONFIG_TEST_SCANF=m
CONFIG_TEST_BITMAP=m
CONFIG_TEST_UUID=m
diff --git a/arch/m68k/configs/mac_defconfig b/arch/m68k/configs/mac_defconfig
index f942b4755702..831695e766a8 100644
--- a/arch/m68k/configs/mac_defconfig
+++ b/arch/m68k/configs/mac_defconfig
@@ -598,7 +598,6 @@ CONFIG_ATOMIC64_SELFTEST=m
CONFIG_ASYNC_RAID6_TEST=m
CONFIG_TEST_HEXDUMP=m
CONFIG_TEST_KSTRTOX=m
-CONFIG_TEST_PRINTF=m
CONFIG_TEST_SCANF=m
CONFIG_TEST_BITMAP=m
CONFIG_TEST_UUID=m
diff --git a/arch/m68k/configs/multi_defconfig b/arch/m68k/configs/multi_defconfig
index b1eaad02efab..901d8d357218 100644
--- a/arch/m68k/configs/multi_defconfig
+++ b/arch/m68k/configs/multi_defconfig
@@ -685,7 +685,6 @@ CONFIG_ATOMIC64_SELFTEST=m
CONFIG_ASYNC_RAID6_TEST=m
CONFIG_TEST_HEXDUMP=m
CONFIG_TEST_KSTRTOX=m
-CONFIG_TEST_PRINTF=m
CONFIG_TEST_SCANF=m
CONFIG_TEST_BITMAP=m
CONFIG_TEST_UUID=m
diff --git a/arch/m68k/configs/mvme147_defconfig b/arch/m68k/configs/mvme147_defconfig
index 6309a4442bb3..2212bb7877e2 100644
--- a/arch/m68k/configs/mvme147_defconfig
+++ b/arch/m68k/configs/mvme147_defconfig
@@ -571,7 +571,6 @@ CONFIG_ATOMIC64_SELFTEST=m
CONFIG_ASYNC_RAID6_TEST=m
CONFIG_TEST_HEXDUMP=m
CONFIG_TEST_KSTRTOX=m
-CONFIG_TEST_PRINTF=m
CONFIG_TEST_SCANF=m
CONFIG_TEST_BITMAP=m
CONFIG_TEST_UUID=m
diff --git a/arch/m68k/configs/mvme16x_defconfig b/arch/m68k/configs/mvme16x_defconfig
index 3feb0731f814..a87b455049e8 100644
--- a/arch/m68k/configs/mvme16x_defconfig
+++ b/arch/m68k/configs/mvme16x_defconfig
@@ -572,7 +572,6 @@ CONFIG_ATOMIC64_SELFTEST=m
CONFIG_ASYNC_RAID6_TEST=m
CONFIG_TEST_HEXDUMP=m
CONFIG_TEST_KSTRTOX=m
-CONFIG_TEST_PRINTF=m
CONFIG_TEST_SCANF=m
CONFIG_TEST_BITMAP=m
CONFIG_TEST_UUID=m
diff --git a/arch/m68k/configs/q40_defconfig b/arch/m68k/configs/q40_defconfig
index ea04b1b0da7d..411e555c7e07 100644
--- a/arch/m68k/configs/q40_defconfig
+++ b/arch/m68k/configs/q40_defconfig
@@ -588,7 +588,6 @@ CONFIG_ATOMIC64_SELFTEST=m
CONFIG_ASYNC_RAID6_TEST=m
CONFIG_TEST_HEXDUMP=m
CONFIG_TEST_KSTRTOX=m
-CONFIG_TEST_PRINTF=m
CONFIG_TEST_SCANF=m
CONFIG_TEST_BITMAP=m
CONFIG_TEST_UUID=m
diff --git a/arch/m68k/configs/sun3_defconfig b/arch/m68k/configs/sun3_defconfig
index f52d9af92153..e095fa159d05 100644
--- a/arch/m68k/configs/sun3_defconfig
+++ b/arch/m68k/configs/sun3_defconfig
@@ -568,7 +568,6 @@ CONFIG_ATOMIC64_SELFTEST=m
CONFIG_ASYNC_RAID6_TEST=m
CONFIG_TEST_HEXDUMP=m
CONFIG_TEST_KSTRTOX=m
-CONFIG_TEST_PRINTF=m
CONFIG_TEST_SCANF=m
CONFIG_TEST_BITMAP=m
CONFIG_TEST_UUID=m
diff --git a/arch/m68k/configs/sun3x_defconfig b/arch/m68k/configs/sun3x_defconfig
index f348447824da..11eb37864ac6 100644
--- a/arch/m68k/configs/sun3x_defconfig
+++ b/arch/m68k/configs/sun3x_defconfig
@@ -569,7 +569,6 @@ CONFIG_ATOMIC64_SELFTEST=m
CONFIG_ASYNC_RAID6_TEST=m
CONFIG_TEST_HEXDUMP=m
CONFIG_TEST_KSTRTOX=m
-CONFIG_TEST_PRINTF=m
CONFIG_TEST_SCANF=m
CONFIG_TEST_BITMAP=m
CONFIG_TEST_UUID=m
diff --git a/arch/powerpc/configs/ppc64_defconfig b/arch/powerpc/configs/ppc64_defconfig
index 465eb96c755e..05018898d282 100644
--- a/arch/powerpc/configs/ppc64_defconfig
+++ b/arch/powerpc/configs/ppc64_defconfig
@@ -444,7 +444,6 @@ CONFIG_TEST_HEXDUMP=m
CONFIG_STRING_SELFTEST=m
CONFIG_TEST_STRING_HELPERS=m
CONFIG_TEST_KSTRTOX=m
-CONFIG_TEST_PRINTF=m
CONFIG_TEST_SCANF=m
CONFIG_TEST_BITMAP=m
CONFIG_TEST_UUID=m
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 1af972a92d06..4834cac1eb8f 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2427,6 +2427,23 @@ config ASYNC_RAID6_TEST
config TEST_HEXDUMP
tristate "Test functions located in the hexdump module at runtime"

+config PRINTF_KUNIT_TEST
+ tristate "KUnit test printf() family of functions at runtime" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ Enable this option to test the printf functions at boot.
+
+ KUnit tests run during boot and output the results to the debug log
+ in TAP format (http://testanything.org/). Only useful for kernel devs
+ running the KUnit test harness, and not intended for inclusion into a
+ production build.
+
+ 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 STRING_KUNIT_TEST
tristate "KUnit test string functions at runtime" if !KUNIT_ALL_TESTS
depends on KUNIT
@@ -2440,9 +2457,6 @@ config STRING_HELPERS_KUNIT_TEST
config TEST_KSTRTOX
tristate "Test kstrto*() family of functions at runtime"

-config TEST_PRINTF
- tristate "Test printf() family of functions at runtime"
-
config TEST_SCANF
tristate "Test scanf() family of functions at runtime"

diff --git a/lib/Makefile b/lib/Makefile
index d5cfc7afbbb8..844665b1f0e7 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -84,7 +84,7 @@ obj-$(CONFIG_TEST_SORT) += test_sort.o
obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_keys.o
obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_key_base.o
obj-$(CONFIG_TEST_DYNAMIC_DEBUG) += test_dynamic_debug.o
-obj-$(CONFIG_TEST_PRINTF) += test_printf.o
+obj-$(CONFIG_PRINTF_KUNIT_TEST) += printf_kunit.o
obj-$(CONFIG_TEST_SCANF) += test_scanf.o

obj-$(CONFIG_TEST_BITMAP) += test_bitmap.o
diff --git a/lib/test_printf.c b/lib/printf_kunit.c
similarity index 89%
rename from lib/test_printf.c
rename to lib/printf_kunit.c
index 59dbe4f9a4cb..fe6f4df92dd5 100644
--- a/lib/test_printf.c
+++ b/lib/printf_kunit.c
@@ -5,7 +5,7 @@

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

-#include <linux/init.h>
+#include <kunit/test.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/printk.h>
@@ -25,8 +25,6 @@

#include <linux/property.h>

-#include "../tools/testing/selftests/kselftest_module.h"
-
#define BUF_SIZE 256
#define PAD_SIZE 16
#define FILL_CHAR '$'
@@ -37,72 +35,71 @@
block \
__diag_pop();

-KSTM_MODULE_GLOBALS();
+static char *test_buffer;
+static char *alloced_buffer;
+
+static struct kunit *kunittest;

-static char *test_buffer __initdata;
-static char *alloced_buffer __initdata;
+#define tc_fail(fmt, ...) \
+ KUNIT_FAIL(kunittest, fmt, ##__VA_ARGS__)

-static int __printf(4, 0) __init
+static void __printf(4, 0)
do_test(int bufsize, const char *expect, int elen,
const char *fmt, va_list ap)
{
va_list aq;
int ret, written;

- total_tests++;
-
memset(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_SIZE);
va_copy(aq, ap);
ret = vsnprintf(test_buffer, bufsize, fmt, aq);
va_end(aq);

if (ret != elen) {
- pr_warn("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",
+ tc_fail("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",
bufsize, fmt, ret, elen);
- return 1;
+ return;
}

if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) {
- pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n", bufsize, fmt);
- return 1;
+ tc_fail("vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n", bufsize, fmt);
+ return;
}

if (!bufsize) {
if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) {
- pr_warn("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",
+ tc_fail("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",
fmt);
- return 1;
}
- return 0;
+ return;
}

written = min(bufsize-1, elen);
if (test_buffer[written]) {
- pr_warn("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",
+ tc_fail("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",
bufsize, fmt);
- return 1;
+ return;
}

if (memchr_inv(test_buffer + written + 1, FILL_CHAR, bufsize - (written + 1))) {
- pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n",
+ tc_fail("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n",
bufsize, fmt);
- return 1;
+ return;
}

if (memchr_inv(test_buffer + bufsize, FILL_CHAR, BUF_SIZE + PAD_SIZE - bufsize)) {
- pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond buffer\n", bufsize, fmt);
- return 1;
+ tc_fail("vsnprintf(buf, %d, \"%s\", ...) wrote beyond buffer\n", bufsize, fmt);
+ return;
}

if (memcmp(test_buffer, expect, written)) {
- pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n",
+ tc_fail("vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n",
bufsize, fmt, test_buffer, written, expect);
- return 1;
+ return;
}
- return 0;
}

-static void __printf(3, 4) __init
+static void __printf(3, 4)
__test(const char *expect, int elen, const char *fmt, ...)
{
va_list ap;
@@ -110,9 +107,8 @@ __test(const char *expect, int elen, const char *fmt, ...)
char *p;

if (elen >= BUF_SIZE) {
- pr_err("error in test suite: expected output length %d too long. Format was '%s'.\n",
- elen, fmt);
- failed_tests++;
+ tc_fail("error in test suite: expected output length %d too long. Format was '%s'.\n",
+ elen, fmt);
return;
}

@@ -124,19 +120,17 @@ __test(const char *expect, int elen, const char *fmt, ...)
* enough and 0), and then we also test that kvasprintf would
* be able to print it as expected.
*/
- failed_tests += do_test(BUF_SIZE, expect, elen, fmt, ap);
+ do_test(BUF_SIZE, expect, elen, fmt, ap);
rand = get_random_u32_inclusive(1, elen + 1);
/* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */
- failed_tests += do_test(rand, expect, elen, fmt, ap);
- failed_tests += do_test(0, expect, elen, fmt, ap);
+ do_test(rand, expect, elen, fmt, ap);
+ do_test(0, expect, elen, fmt, ap);

p = kvasprintf(GFP_KERNEL, fmt, ap);
if (p) {
- total_tests++;
if (memcmp(p, expect, elen+1)) {
- pr_warn("kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n",
+ tc_fail("kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n",
fmt, p, expect);
- failed_tests++;
}
kfree(p);
}
@@ -146,7 +140,7 @@ __test(const char *expect, int elen, const char *fmt, ...)
#define test(expect, fmt, ...) \
__test(expect, strlen(expect), fmt, ##__VA_ARGS__)

-static void __init
+static void
test_basic(void)
{
/* Work around annoying "warning: zero-length gnu_printf format string". */
@@ -158,7 +152,7 @@ test_basic(void)
__test("xxx\0yyy", 7, "xxx%cyyy", '\0');
}

-static void __init
+static void
test_number(void)
{
test("0x1234abcd ", "%#-12x", 0x1234abcd);
@@ -180,7 +174,7 @@ test_number(void)
test("00|0|0|0|0", "%.2d|%.1d|%.0d|%.*d|%1.0d", 0, 0, 0, 0, 0, 0);
}

-static void __init
+static void
test_string(void)
{
test("", "%s%.0s", "", "123");
@@ -218,7 +212,7 @@ test_string(void)
#define ZEROS "00000000" /* hex 32 zero bits */
#define ONES "ffffffff" /* hex 32 one bits */

-static int __init
+static int
plain_format(void)
{
char buf[PLAIN_BUF_SIZE];
@@ -250,7 +244,7 @@ plain_format(void)
#define ZEROS ""
#define ONES ""

-static int __init
+static int
plain_format(void)
{
/* Format is implicitly tested for 32 bit machines by plain_hash() */
@@ -259,7 +253,7 @@ plain_format(void)

#endif /* BITS_PER_LONG == 64 */

-static int __init
+static int
plain_hash_to_buffer(const void *p, char *buf, size_t len)
{
int nchars;
@@ -278,7 +272,7 @@ plain_hash_to_buffer(const void *p, char *buf, size_t len)
return 0;
}

-static int __init
+static int
plain_hash(void)
{
char buf[PLAIN_BUF_SIZE];
@@ -298,32 +292,29 @@ plain_hash(void)
* We can't use test() to test %p because we don't know what output to expect
* after an address is hashed.
*/
-static void __init
+static void
plain(void)
{
int err;

if (no_hash_pointers) {
pr_warn("skipping plain 'p' tests");
- skipped_tests += 2;
return;
}

err = plain_hash();
if (err) {
- pr_warn("plain 'p' does not appear to be hashed\n");
- failed_tests++;
+ tc_fail("plain 'p' does not appear to be hashed\n");
return;
}

err = plain_format();
if (err) {
- pr_warn("hashing plain 'p' has unexpected format\n");
- failed_tests++;
+ tc_fail("hashing plain 'p' has unexpected format\n");
}
}

-static void __init
+static void
test_hashed(const char *fmt, const void *p)
{
char buf[PLAIN_BUF_SIZE];
@@ -343,7 +334,7 @@ test_hashed(const char *fmt, const void *p)
/*
* NULL pointers aren't hashed.
*/
-static void __init
+static void
null_pointer(void)
{
test(ZEROS "00000000", "%p", NULL);
@@ -354,7 +345,7 @@ null_pointer(void)
/*
* Error pointers aren't hashed.
*/
-static void __init
+static void
error_pointer(void)
{
test(ONES "fffffff5", "%p", ERR_PTR(-11));
@@ -364,7 +355,7 @@ error_pointer(void)

#define PTR_INVALID ((void *)0x000000ab)

-static void __init
+static void
invalid_pointer(void)
{
test_hashed("%p", PTR_INVALID);
@@ -372,18 +363,18 @@ invalid_pointer(void)
test("(efault)", "%pE", PTR_INVALID);
}

-static void __init
+static void
symbol_ptr(void)
{
}

-static void __init
+static void
kernel_ptr(void)
{
/* We can't test this without access to kptr_restrict. */
}

-static void __init
+static void
struct_resource(void)
{
struct resource test_resource = {
@@ -432,7 +423,7 @@ struct_resource(void)
"%pR", &test_resource);
}

-static void __init
+static void
struct_range(void)
{
struct range test_range = DEFINE_RANGE(0xc0ffee00ba5eba11,
@@ -448,17 +439,17 @@ struct_range(void)
"%pra", &test_range);
}

-static void __init
+static void
addr(void)
{
}

-static void __init
+static void
escaped_str(void)
{
}

-static void __init
+static void
hex_string(void)
{
const char buf[3] = {0xc0, 0xff, 0xee};
@@ -469,7 +460,7 @@ hex_string(void)
"%*ph|%*phC|%*phD|%*phN", 3, buf, 3, buf, 3, buf, 3, buf);
}

-static void __init
+static void
mac(void)
{
const u8 addr[6] = {0x2d, 0x48, 0xd6, 0xfc, 0x7a, 0x05};
@@ -481,7 +472,7 @@ mac(void)
test("057afcd6482d", "%pmR", addr);
}

-static void __init
+static void
ip4(void)
{
struct sockaddr_in sa;
@@ -496,19 +487,19 @@ ip4(void)
test("001.002.003.004:12345|1.2.3.4:12345", "%piSp|%pISp", &sa, &sa);
}

-static void __init
+static void
ip6(void)
{
}

-static void __init
+static void
ip(void)
{
ip4();
ip6();
}

-static void __init
+static void
uuid(void)
{
const char uuid[16] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
@@ -520,7 +511,7 @@ uuid(void)
test("03020100-0504-0706-0809-0A0B0C0D0E0F", "%pUL", uuid);
}

-static struct dentry test_dentry[4] __initdata = {
+static struct dentry test_dentry[4] = {
{ .d_parent = &test_dentry[0],
.d_name = QSTR_INIT(test_dentry[0].d_iname, 3),
.d_iname = "foo" },
@@ -535,7 +526,7 @@ static struct dentry test_dentry[4] __initdata = {
.d_iname = "romeo" },
};

-static void __init
+static void
dentry(void)
{
test("foo", "%pd", &test_dentry[0]);
@@ -556,12 +547,12 @@ dentry(void)
test(" bravo/alfa| bravo/alfa", "%12pd2|%*pd2", &test_dentry[2], 12, &test_dentry[2]);
}

-static void __init
+static void
struct_va_format(void)
{
}

-static void __init
+static void
time_and_date(void)
{
/* 1543210543 */
@@ -595,12 +586,12 @@ time_and_date(void)
test("15:32:23|0119-00-04", "%ptTtrs|%ptTdrs", &t, &t);
}

-static void __init
+static void
struct_clk(void)
{
}

-static void __init
+static void
large_bitmap(void)
{
const int nbits = 1 << 16;
@@ -614,7 +605,7 @@ large_bitmap(void)
bitmap_free(bits);
}

-static void __init
+static void
bitmap(void)
{
DECLARE_BITMAP(bits, 20);
@@ -637,7 +628,7 @@ bitmap(void)
large_bitmap();
}

-static void __init
+static void
netdev_features(void)
{
}
@@ -663,7 +654,7 @@ static const struct page_flags_test pft[] = {
"%#x", "kasantag"},
};

-static void __init
+static void
page_flags_test(int section, int node, int zone, int last_cpupid,
int kasan_tag, unsigned long flags, const char *name,
char *cmp_buf)
@@ -701,7 +692,7 @@ page_flags_test(int section, int node, int zone, int last_cpupid,
test(cmp_buf, "%pGp", &flags);
}

-static void __init
+static void
flags(void)
{
unsigned long flags;
@@ -749,7 +740,7 @@ flags(void)
kfree(cmp_buffer);
}

-static void __init fwnode_pointer(void)
+static void fwnode_pointer(void)
{
const struct software_node first = { .name = "first" };
const struct software_node second = { .name = "second", .parent = &first };
@@ -776,7 +767,7 @@ static void __init fwnode_pointer(void)
software_node_unregister_node_group(group);
}

-static void __init fourcc_pointer(void)
+static void fourcc_pointer(void)
{
struct {
u32 code;
@@ -793,7 +784,7 @@ static void __init fourcc_pointer(void)
test(try[i].str, "%p4cc", &try[i].code);
}

-static void __init
+static void
errptr(void)
{
test("-1234", "%pe", ERR_PTR(-1234));
@@ -813,7 +804,7 @@ errptr(void)
#endif
}

-static void __init
+static void
test_pointer(void)
{
plain();
@@ -842,13 +833,15 @@ test_pointer(void)
fourcc_pointer();
}

-static void __init selftest(void)
+static void printf_test(struct kunit *test)
{
alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
if (!alloced_buffer)
return;
test_buffer = alloced_buffer + PAD_SIZE;

+ kunittest = test;
+
test_basic();
test_number();
test_string();
@@ -857,7 +850,18 @@ static void __init selftest(void)
kfree(alloced_buffer);
}

-KSTM_MODULE_LOADERS(test_printf);
+static struct kunit_case printf_test_cases[] = {
+ KUNIT_CASE(printf_test),
+ {}
+};
+
+static struct kunit_suite printf_test_suite = {
+ .name = "printf",
+ .test_cases = printf_test_cases,
+};
+
+kunit_test_suite(printf_test_suite);
+
MODULE_AUTHOR("Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>");
MODULE_DESCRIPTION("Test cases for printf facility");
MODULE_LICENSE("GPL");
diff --git a/tools/testing/selftests/lib/config b/tools/testing/selftests/lib/config
index dc15aba8d0a3..0a63594177c2 100644
--- a/tools/testing/selftests/lib/config
+++ b/tools/testing/selftests/lib/config
@@ -1,4 +1,3 @@
-CONFIG_TEST_PRINTF=m
CONFIG_TEST_SCANF=m
CONFIG_TEST_BITMAP=m
CONFIG_PRIME_NUMBERS=m
diff --git a/tools/testing/selftests/lib/printf.sh b/tools/testing/selftests/lib/printf.sh
deleted file mode 100755
index 05f4544e87f9..000000000000
--- a/tools/testing/selftests/lib/printf.sh
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/bin/sh
-# SPDX-License-Identifier: GPL-2.0
-# Tests the printf infrastructure using test_printf kernel module.
-$(dirname $0)/../kselftest/module.sh "printf" test_printf

--
2.48.1