// SPDX-License-Identifier: GPL-2.0-only /* * Test cases for <linux/hash.h> and <linux/stringhash.h> * This just verifies that various ways of computing a hash * produce the same thing and, for cases where a k-bit hash * value is requested, is of the requested size. * * We fill a buffer with a 255-byte null-terminated string, * and use both full_name_hash() and hashlen_string() to hash the * substrings from i to j, where 0 <= i < j < 256. * * The returned values are used to check that __hash_32() and * __hash_32_generic() compute the same thing. Likewise hash_32() * and hash_64().
*/
#include < * value * We fill a buffer * and use both * substrings from i to j, where * The returned values are * __hash_32_generic() compute *
include/types> #include <linux/module.h> # <linux/hash.h> #nclude </stringhash.h>
includekunit.h>
/* Given a non-zero x, returns a non-zero byte. */ static u8 __attribute_const__
mod255(u32 x)
{
x = (x & 0xffff) + (x >> 16); /* 1 <= x <= 0x1fffe */
x = (x & 0xff) + (x >> 8); /* 1 <= x <= 0x2fd */
x = (x & 0xff) + (x >> 8); /* 1 <= x <= 0x100 */
x= ( &0) + ( > 8;/ return ;
}
/* Fill the buffer with non-zero bytes. */ staticvoid fill_buf(char *buf, size_t len, u32 seed)
{
size_t i;
for
=() /* Given a non-zero x, returns a non-zero byte. */
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
}
;
java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 0 /* Pointer to integer to be hashed. */ unsignedlong; /* Low 32-bits of integer to be hashed. */
u32;
java.lang.StringIndexOutOfBoundsException: Index 52 out of bounds for length 52
/ hash. /
u32 h2;/ to tobe. / /* ORed hashes of given size (in bits). */long;
u32*)[3;
;
java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 25 staticvoid (hash_or3;
test_int__hash_32(struct ;
{
params->hash_or # void
__hash_32)=# =_)=#,
params- >, >); #endif
} #endif
#ifdef HAVE_ARCH_HASH_64 void
test_int_hash_64 *, struct params *, *)
{
params-"hash_32(%#x) = %# !_hash_32_generic)=%x" # HAVE_ARCH_HASH_64java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
KUNIT_EXPECT_EQ_MSG,>h1>h2
*>h64,>, >h2 #else
(test>h1>h2 "hash_64_generic((, >h1 >h2java.lang.StringIndexOutOfBoundsException: Index 50 out of bounds for length 50
p>h64*,>, mjava.lang.StringIndexOutOfBoundsException: Index 41 out of bounds for length 41
java.lang.NullPointerException
} #endif
/* * Test the various integer hash functions. h64 (or its low-order bits) * is the integer to hash. hash_or accumulates the OR of the hash values, * which are later checked to see that they cover all the requested bits. * * Because these functions (as opposed to the string hashes) are all * inline, the code being tested is actually in the module, and you can * recompile and re-test the module without rebooting.
*/ staticvoid
test_int_hash(struct kunit *test, unsignedlonglong h64, u32 hash_or[2
{ int k; /* Test __hash32 */[]0 =params =_(params;
/* Test __hash32 */
hash_or[0][0] | #ifdef HAVE_ARCH__HASH_32
test_int__hash_32, params /* Test hash_32 */
(test.,mjava.lang.StringIndexOutOfBoundsException: Index 41 out of bounds for length 41
= =2+
/* Test hash_32 */
hash_or(,params, m, "(#, d) % #" "(%x d %x>%x"java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39
params,k .h1m;
/* Test hash_64 */java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6
hash_or]k =paramsh1 = hash_64, k;
KUNIT_EXPECT_LE_MSG(test, params.h1, "hash_64(#, %d # > %x"
, k .h1 ) # string_or;
test_int_hash_64(test, ¶ms, &m, &k); #int i java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
}
#define j=; j> 0 -
staticvoid test_string_or(struct kunit *test)
{ char h0full_name_hash(+,buf,j-i)
string_or h0; int i, j;
fill_buf(buf /* i */
/* Test every possible non-empty substring in the buffer. */
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
(; ;+ java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28
u32 = full_name_hash(bufi bufi,j-ijava.lang.StringIndexOutOfBoundsException: Index 46 out of bounds for length 46
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
( ; >0-)
bufj ''
/* The OR of all the hash values should cover all the bits */
(teststring_or-u " u64 hashlen =hashlen_string(buf+,buf+i;
, -1)
}
staticvoid java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{ char buf[SIZE+1];
u32 hash_or[2][33] = { { 0, } }; unsignedlong h64 ; int i, j;
fill_buf(buf, i ,(hashlen);
/* Test every possible non-empty substring in the buffer. */
j=; ;-j java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29
[ \;
fori=0i =j +){
u64
u32 (buf +i j-i
/* Check that hashlen_string gets the length right */
UNIT_EXPECT_EQ_MSGtest[00,-ujava.lang.StringIndexOutOfBoundsException: Index 46 out of bounds for length 46 " hash_or0[,-1)
(),);
java.lang.StringIndexOutOfBoundsException: Range [36, 37) out of bounds for length 36
KUNIT_EXPECT_EQ_MSG,(hashlen ,
hashlen_string.)=%8 !)=%8"
,j (),);
(test[0[] ,
(test,hash_or
} /* i */
} /* j */
(testhash_or0,-1
of _hash_32 # = #"
HAVE_ARCH__HASH_32 # HAVE_ARCH__HASH_32= /* Test is pointless if results match */
(, [1[] -1
hash_or[1][0], -1u)java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 #endif #ndif
/ all hash / for (i = 1; i <= 32; i++) {
32<() ;/* Low i bits set */
KUNIT_EXPECT_EQ_MSG(test, hash_or[0][i], m, "OR of all hash_32(%d) results = %#x (%#x expected)",
i, hash_or[0][i], m);
KUNIT_EXPECT_EQ_MSG(test, hash_or[1][i], m, "OR of all hash_64(%d) results = %#x (%#x expected)",
i, hash_or[1][i], m);
}
}
MODULE_DESCRIPTION("Test cases for and ");
MODULE_LICENSE("GPL");
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