Commit 03270c13 authored by Matthew Wilcox's avatar Matthew Wilcox Committed by Linus Torvalds
Browse files

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: default avatarMatthew 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 3b3c4bab

lib/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -575,4 +575,7 @@ config PARMAN 
config PRIME_NUMBERS

	tristate



config STRING_SELFTEST

	bool "Test string functions"



endmenu

lib/string.c

+129 −0
Original line number Diff line number Diff line
@@ -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 */

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