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author | Matthew Wilcox <mawilcox@microsoft.com> | 2017-09-08 16:13:52 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-08 18:26:48 -0700 |
commit | 03270c13c5ffaa6ac76fe70d0b6929313ca73d86 (patch) | |
tree | 0f566be5762b64fb1d5eef07ff55481181155c73 | |
parent | lib/string.c: add multibyte memset functions (diff) | |
download | linux-dev-03270c13c5ffaa6ac76fe70d0b6929313ca73d86.tar.xz linux-dev-03270c13c5ffaa6ac76fe70d0b6929313ca73d86.zip |
lib/string.c: add testcases for memset16/32/64
[akpm@linux-foundation.org: minor tweaks]
Link: http://lkml.kernel.org/r/20170720184539.31609-3-willy@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: David Miller <davem@davemloft.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r-- | lib/Kconfig | 3 | ||||
-rw-r--r-- | lib/string.c | 129 |
2 files changed, 132 insertions, 0 deletions
diff --git a/lib/Kconfig b/lib/Kconfig index 6762529ad9e4..40b114a11d7c 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -575,4 +575,7 @@ config PARMAN config PRIME_NUMBERS tristate +config STRING_SELFTEST + bool "Test string functions" + endmenu diff --git a/lib/string.c b/lib/string.c index 198148bb61fd..abf6499e3915 100644 --- a/lib/string.c +++ b/lib/string.c @@ -1051,3 +1051,132 @@ void fortify_panic(const char *name) BUG(); } EXPORT_SYMBOL(fortify_panic); + +#ifdef CONFIG_STRING_SELFTEST +#include <linux/slab.h> +#include <linux/module.h> + +static __init int memset16_selftest(void) +{ + unsigned i, j, k; + u16 v, *p = kmalloc(256 * 2 * 2, GFP_KERNEL); + + for (i = 0; i < 256; i++) { + for (j = 0; j < 256; j++) { + memset(p, 0xa1, 256 * 2 * sizeof(v)); + memset16(p + i, 0xb1b2, j); + for (k = 0; k < 512; k++) { + v = p[k]; + if (k < i) { + if (v != 0xa1a1) + goto fail; + } else if (k < i + j) { + if (v != 0xb1b2) + goto fail; + } else { + if (v != 0xa1a1) + goto fail; + } + } + } + } + +fail: + kfree(p); + if (i < 256) + return (i << 24) | (j << 16) | k; + return 0; +} + +static __init int memset32_selftest(void) +{ + unsigned i, j, k; + u32 v, *p = kmalloc(256 * 2 * 4, GFP_KERNEL); + + for (i = 0; i < 256; i++) { + for (j = 0; j < 256; j++) { + memset(p, 0xa1, 256 * 2 * sizeof(v)); + memset32(p + i, 0xb1b2b3b4, j); + for (k = 0; k < 512; k++) { + v = p[k]; + if (k < i) { + if (v != 0xa1a1a1a1) + goto fail; + } else if (k < i + j) { + if (v != 0xb1b2b3b4) + goto fail; + } else { + if (v != 0xa1a1a1a1) + goto fail; + } + } + } + } + +fail: + kfree(p); + if (i < 256) + return (i << 24) | (j << 16) | k; + return 0; +} + +static __init int memset64_selftest(void) +{ + unsigned i, j, k; + u64 v, *p = kmalloc(256 * 2 * 8, GFP_KERNEL); + + for (i = 0; i < 256; i++) { + for (j = 0; j < 256; j++) { + memset(p, 0xa1, 256 * 2 * sizeof(v)); + memset64(p + i, 0xb1b2b3b4b5b6b7b8ULL, j); + for (k = 0; k < 512; k++) { + v = p[k]; + if (k < i) { + if (v != 0xa1a1a1a1a1a1a1a1ULL) + goto fail; + } else if (k < i + j) { + if (v != 0xb1b2b3b4b5b6b7b8ULL) + goto fail; + } else { + if (v != 0xa1a1a1a1a1a1a1a1ULL) + goto fail; + } + } + } + } + +fail: + kfree(p); + if (i < 256) + return (i << 24) | (j << 16) | k; + return 0; +} + +static __init int string_selftest_init(void) +{ + int test, subtest; + + test = 1; + subtest = memset16_selftest(); + if (subtest) + goto fail; + + test = 2; + subtest = memset32_selftest(); + if (subtest) + goto fail; + + test = 3; + subtest = memset64_selftest(); + if (subtest) + goto fail; + + pr_info("String selftests succeeded\n"); + return 0; +fail: + pr_crit("String selftest failure %d.%08x\n", test, subtest); + return 0; +} + +module_init(string_selftest_init); +#endif /* CONFIG_STRING_SELFTEST */ |