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Fri, 14 Feb 2025 13:52:55 -0800 (PST) From: Tamir Duberstein Date: Fri, 14 Feb 2025 16:52:39 -0500 Subject: [PATCH v4 1/3] printf: convert self-test to KUnit Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250214-printf-kunit-convert-v4-1-c254572f1565@gmail.com> References: <20250214-printf-kunit-convert-v4-0-c254572f1565@gmail.com> In-Reply-To: <20250214-printf-kunit-convert-v4-0-c254572f1565@gmail.com> To: Arpitha Raghunandan <98.arpi@gmail.com>, David Gow , Petr Mladek , Steven Rostedt , Andy Shevchenko , Rasmus Villemoes , Sergey Senozhatsky , Andrew Morton , Shuah Khan , Jonathan Corbet , Geert Uytterhoeven , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Brendan Higgins Cc: linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linuxppc-dev@lists.ozlabs.org, Tamir Duberstein X-Mailer: b4 0.15-dev 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. Signed-off-by: Tamir Duberstein --- Documentation/core-api/printk-formats.rst | 4 +- MAINTAINERS | 2 +- lib/Kconfig.debug | 12 +- lib/Makefile | 1 - lib/tests/Makefile | 1 + lib/{test_printf.c => tests/printf_kunit.c} | 188 +++++++++++++++------------- tools/testing/selftests/lib/config | 1 - tools/testing/selftests/lib/printf.sh | 4 - 8 files changed, 117 insertions(+), 96 deletions(-) diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst index ecccc0473da9..4bdc394e86af 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 with -one or more test cases, if at all feasible. +If you add other %p extensions, please extend +with one or more test cases, if at all feasible. Thank you for your cooperation and attention. diff --git a/MAINTAINERS b/MAINTAINERS index 92fc0eca7061..d85366e22ff6 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -25466,8 +25466,8 @@ R: Sergey Senozhatsky 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/test_scanf.c +F: lib/tests/printf_kunit.c F: lib/vsprintf.c VT1211 HARDWARE MONITOR DRIVER diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 85b95d645b10..0c27745dff56 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -2436,6 +2436,15 @@ 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 runtime. + + If unsure, say N. + config STRING_KUNIT_TEST tristate "KUnit test string functions at runtime" if !KUNIT_ALL_TESTS depends on KUNIT @@ -2449,9 +2458,6 @@ 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 961aef91d493..f31e6a3100ba 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -77,7 +77,6 @@ obj-$(CONFIG_TEST_RHASHTABLE) += test_rhashtable.o obj-$(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_TEST_SCANF) += test_scanf.o obj-$(CONFIG_TEST_BITMAP) += test_bitmap.o diff --git a/lib/tests/Makefile b/lib/tests/Makefile index 8961fbcff7a4..183c6a838a5d 100644 --- a/lib/tests/Makefile +++ b/lib/tests/Makefile @@ -30,6 +30,7 @@ obj-$(CONFIG_LINEAR_RANGES_TEST) += test_linear_ranges.o obj-$(CONFIG_MEMCPY_KUNIT_TEST) += memcpy_kunit.o CFLAGS_overflow_kunit.o = $(call cc-disable-warning, tautological-constant-out-of-range-compare) obj-$(CONFIG_OVERFLOW_KUNIT_TEST) += overflow_kunit.o +obj-$(CONFIG_PRINTF_KUNIT_TEST) += printf_kunit.o obj-$(CONFIG_SIPHASH_KUNIT_TEST) += siphash_kunit.o obj-$(CONFIG_SLUB_KUNIT_TEST) += slub_kunit.o obj-$(CONFIG_TEST_SORT) += test_sort.o diff --git a/lib/test_printf.c b/lib/tests/printf_kunit.c similarity index 87% rename from lib/test_printf.c rename to lib/tests/printf_kunit.c index 59dbe4f9a4cb..287bbfb61148 100644 --- a/lib/test_printf.c +++ b/lib/tests/printf_kunit.c @@ -3,9 +3,7 @@ * Test cases for printf facility. */ -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include +#include #include #include #include @@ -25,8 +23,6 @@ #include -#include "../tools/testing/selftests/kselftest_module.h" - #define BUF_SIZE 256 #define PAD_SIZE 16 #define FILL_CHAR '$' @@ -37,12 +33,17 @@ block \ __diag_pop(); -KSTM_MODULE_GLOBALS(); +static unsigned int total_tests; + +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) { @@ -57,52 +58,50 @@ do_test(int bufsize, const char *expect, int elen, 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", 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", + 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", - fmt); - return 1; + tc_fail("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer", fmt); } - 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", 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", 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", 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'", 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 +109,8 @@ __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'.", + elen, fmt); return; } @@ -124,19 +122,18 @@ __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'", fmt, p, expect); - failed_tests++; } kfree(p); } @@ -146,7 +143,7 @@ __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 +155,7 @@ test_basic(void) __test("xxx\0yyy", 7, "xxx%cyyy", '\0'); } -static void __init +static void test_number(void) { test("0x1234abcd ", "%#-12x", 0x1234abcd); @@ -180,7 +177,7 @@ 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 +215,7 @@ 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]; @@ -230,7 +227,7 @@ plain_format(void) return -1; if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) { - pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"", + kunit_warn(kunittest, "crng possibly not yet initialized. plain 'p' buffer contains \"%s\"", PTR_VAL_NO_CRNG); return 0; } @@ -250,7 +247,7 @@ 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 +256,7 @@ 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; @@ -270,7 +267,7 @@ plain_hash_to_buffer(const void *p, char *buf, size_t len) return -1; if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) { - pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"", + kunit_warn(kunittest, "crng possibly not yet initialized. plain 'p' buffer contains \"%s\"", PTR_VAL_NO_CRNG); return 0; } @@ -278,7 +275,7 @@ 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 +295,29 @@ 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; + kunit_warn(kunittest, "skipping plain 'p' tests"); 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"); 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"); } } -static void __init +static void test_hashed(const char *fmt, const void *p) { char buf[PLAIN_BUF_SIZE]; @@ -343,7 +337,7 @@ 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 +348,7 @@ 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 +358,7 @@ error_pointer(void) #define PTR_INVALID ((void *)0x000000ab) -static void __init +static void invalid_pointer(void) { test_hashed("%p", PTR_INVALID); @@ -372,18 +366,18 @@ 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 +426,7 @@ struct_resource(void) "%pR", &test_resource); } -static void __init +static void struct_range(void) { struct range test_range = DEFINE_RANGE(0xc0ffee00ba5eba11, @@ -448,17 +442,17 @@ 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 +463,7 @@ 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 +475,7 @@ mac(void) test("057afcd6482d", "%pmR", addr); } -static void __init +static void ip4(void) { struct sockaddr_in sa; @@ -496,19 +490,19 @@ 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 +514,7 @@ 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 +529,7 @@ 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 +550,12 @@ 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 +589,12 @@ 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 +608,7 @@ large_bitmap(void) bitmap_free(bits); } -static void __init +static void bitmap(void) { DECLARE_BITMAP(bits, 20); @@ -637,7 +631,7 @@ bitmap(void) large_bitmap(); } -static void __init +static void netdev_features(void) { } @@ -663,7 +657,7 @@ 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 +695,7 @@ 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 +743,7 @@ 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 }; @@ -763,7 +757,7 @@ static void __init fwnode_pointer(void) rval = software_node_register_node_group(group); if (rval) { - pr_warn("cannot register softnodes; rval %d\n", rval); + kunit_warn(kunittest, "cannot register softnodes; rval %d", rval); return; } @@ -776,7 +770,7 @@ 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 +787,7 @@ 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 +807,7 @@ errptr(void) #endif } -static void __init +static void test_pointer(void) { plain(); @@ -842,13 +836,15 @@ 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 +853,31 @@ static void __init selftest(void) kfree(alloced_buffer); } -KSTM_MODULE_LOADERS(test_printf); +static int printf_suite_init(struct kunit_suite *suite) +{ + total_tests = 0; + return 0; +} + +static void printf_suite_exit(struct kunit_suite *suite) +{ + kunit_info(suite, "ran %u tests", total_tests); +} + +static struct kunit_case printf_test_cases[] = { + KUNIT_CASE(printf_test), + {} +}; + +static struct kunit_suite printf_test_suite = { + .name = "printf", + .suite_init = printf_suite_init, + .suite_exit = printf_suite_exit, + .test_cases = printf_test_cases, +}; + +kunit_test_suite(printf_test_suite); + MODULE_AUTHOR("Rasmus Villemoes "); 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 306a3d4dca98..f4b4b8822241 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_TEST_BITOPS=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