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- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt "\n"
- #include <linux/compiler.h>
- #include <linux/types.h>
- #include <linux/module.h>
- #include <linux/hash.h>
- #include <linux/stringhash.h>
- #include <linux/printk.h>
- static u32 __init __attribute_const__
- xorshift(u32 seed)
- {
- seed ^= seed << 13;
- seed ^= seed >> 17;
- seed ^= seed << 5;
- return seed;
- }
- static u8 __init __attribute_const__
- mod255(u32 x)
- {
- x = (x & 0xffff) + (x >> 16);
- x = (x & 0xff) + (x >> 8);
- x = (x & 0xff) + (x >> 8);
- x = (x & 0xff) + (x >> 8);
- return x;
- }
- static void __init
- fill_buf(char *buf, size_t len, u32 seed)
- {
- size_t i;
- for (i = 0; i < len; i++) {
- seed = xorshift(seed);
- buf[i] = mod255(seed);
- }
- }
- static bool __init
- test_int_hash(unsigned long long h64, u32 hash_or[2][33])
- {
- int k;
- u32 h0 = (u32)h64, h1, h2;
-
- hash_or[0][0] |= h1 = __hash_32(h0);
- #ifdef HAVE_ARCH__HASH_32
- hash_or[1][0] |= h2 = __hash_32_generic(h0);
- #if HAVE_ARCH__HASH_32 == 1
- if (h1 != h2) {
- pr_err("__hash_32(%#x) = %#x != __hash_32_generic() = %#x",
- h0, h1, h2);
- return false;
- }
- #endif
- #endif
-
- for (k = 1; k <= 32; k++) {
- u32 const m = ((u32)2 << (k-1)) - 1;
-
- hash_or[0][k] |= h1 = hash_32(h0, k);
- if (h1 > m) {
- pr_err("hash_32(%#x, %d) = %#x > %#x", h0, k, h1, m);
- return false;
- }
- #ifdef HAVE_ARCH_HASH_32
- h2 = hash_32_generic(h0, k);
- #if HAVE_ARCH_HASH_32 == 1
- if (h1 != h2) {
- pr_err("hash_32(%#x, %d) = %#x != hash_32_generic() "
- " = %#x", h0, k, h1, h2);
- return false;
- }
- #else
- if (h2 > m) {
- pr_err("hash_32_generic(%#x, %d) = %#x > %#x",
- h0, k, h1, m);
- return false;
- }
- #endif
- #endif
-
- hash_or[1][k] |= h1 = hash_64(h64, k);
- if (h1 > m) {
- pr_err("hash_64(%#llx, %d) = %#x > %#x", h64, k, h1, m);
- return false;
- }
- #ifdef HAVE_ARCH_HASH_64
- h2 = hash_64_generic(h64, k);
- #if HAVE_ARCH_HASH_64 == 1
- if (h1 != h2) {
- pr_err("hash_64(%#llx, %d) = %#x != hash_64_generic() "
- "= %#x", h64, k, h1, h2);
- return false;
- }
- #else
- if (h2 > m) {
- pr_err("hash_64_generic(%#llx, %d) = %#x > %#x",
- h64, k, h1, m);
- return false;
- }
- #endif
- #endif
- }
- (void)h2;
- return true;
- }
- #define SIZE 256
- static int __init
- test_hash_init(void)
- {
- char buf[SIZE+1];
- u32 string_or = 0, hash_or[2][33] = { { 0, } };
- unsigned tests = 0;
- unsigned long long h64 = 0;
- int i, j;
- fill_buf(buf, SIZE, 1);
-
- for (j = SIZE; j > 0; --j) {
- buf[j] = '\0';
- for (i = 0; i <= j; i++) {
- u64 hashlen = hashlen_string(buf+i, buf+i);
- u32 h0 = full_name_hash(buf+i, buf+i, j-i);
-
- if (hashlen_len(hashlen) != j-i) {
- pr_err("hashlen_string(%d..%d) returned length"
- " %u, expected %d",
- i, j, hashlen_len(hashlen), j-i);
- return -EINVAL;
- }
-
- if (hashlen_hash(hashlen) != h0) {
- pr_err("hashlen_string(%d..%d) = %08x != "
- "full_name_hash() = %08x",
- i, j, hashlen_hash(hashlen), h0);
- return -EINVAL;
- }
- string_or |= h0;
- h64 = h64 << 32 | h0;
- if (!test_int_hash(h64, hash_or))
- return -EINVAL;
- tests++;
- }
- }
-
- if (~string_or) {
- pr_err("OR of all string hash results = %#x != %#x",
- string_or, -1u);
- return -EINVAL;
- }
- if (~hash_or[0][0]) {
- pr_err("OR of all __hash_32 results = %#x != %#x",
- hash_or[0][0], -1u);
- return -EINVAL;
- }
- #ifdef HAVE_ARCH__HASH_32
- #if HAVE_ARCH__HASH_32 != 1
- if (~hash_or[1][0]) {
- pr_err("OR of all __hash_32_generic results = %#x != %#x",
- hash_or[1][0], -1u);
- return -EINVAL;
- }
- #endif
- #endif
-
- for (i = 1; i <= 32; i++) {
- u32 const m = ((u32)2 << (i-1)) - 1;
- if (hash_or[0][i] != m) {
- pr_err("OR of all hash_32(%d) results = %#x "
- "(%#x expected)", i, hash_or[0][i], m);
- return -EINVAL;
- }
- if (hash_or[1][i] != m) {
- pr_err("OR of all hash_64(%d) results = %#x "
- "(%#x expected)", i, hash_or[1][i], m);
- return -EINVAL;
- }
- }
-
- #ifdef HAVE_ARCH__HASH_32
- #if HAVE_ARCH__HASH_32 != 1
- pr_info("__hash_32() is arch-specific; not compared to generic.");
- #endif
- #else
- pr_info("__hash_32() has no arch implementation to test.");
- #endif
- #ifdef HAVE_ARCH_HASH_32
- #if HAVE_ARCH_HASH_32 != 1
- pr_info("hash_32() is arch-specific; not compared to generic.");
- #endif
- #else
- pr_info("hash_32() has no arch implementation to test.");
- #endif
- #ifdef HAVE_ARCH_HASH_64
- #if HAVE_ARCH_HASH_64 != 1
- pr_info("hash_64() is arch-specific; not compared to generic.");
- #endif
- #else
- pr_info("hash_64() has no arch implementation to test.");
- #endif
- pr_notice("%u tests passed.", tests);
- return 0;
- }
- static void __exit test_hash_exit(void)
- {
- }
- module_init(test_hash_init);
- module_exit(test_hash_exit);
- MODULE_LICENSE("GPL");
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