__ __ __ __ _____ _ _ _____ _ _ _ | \/ | \ \ / / | __ \ (_) | | / ____| | | | | | \ / |_ __\ V / | |__) | __ ___ ____ _| |_ ___ | (___ | |__ ___| | | | |\/| | '__|> < | ___/ '__| \ \ / / _` | __/ _ \ \___ \| '_ \ / _ \ | | | | | | |_ / . \ | | | | | |\ V / (_| | || __/ ____) | | | | __/ | | |_| |_|_(_)_/ \_\ |_| |_| |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1 if you need WebShell for Seo everyday contact me on Telegram Telegram Address : @jackleetFor_More_Tools:
#ifndef _LINUX_HASH_H
#define _LINUX_HASH_H
/* Fast hashing routine for ints, longs and pointers.
(C) 2002 Nadia Yvette Chambers, IBM */
#include <asm/types.h>
#include <linux/compiler.h>
/*
* The "GOLDEN_RATIO_PRIME" is used in ifs/btrfs/brtfs_inode.h and
* fs/inode.c. It's not actually prime any more (the previous primes
* were actively bad for hashing), but the name remains.
*/
#if BITS_PER_LONG == 32
#define GOLDEN_RATIO_PRIME GOLDEN_RATIO_32
#define hash_long(val, bits) hash_32(val, bits)
#elif BITS_PER_LONG == 64
#define hash_long(val, bits) hash_64(val, bits)
#define GOLDEN_RATIO_PRIME GOLDEN_RATIO_64
#else
#error Wordsize not 32 or 64
#endif
/*
* This hash multiplies the input by a large odd number and takes the
* high bits. Since multiplication propagates changes to the most
* significant end only, it is essential that the high bits of the
* product be used for the hash value.
*
* Chuck Lever verified the effectiveness of this technique:
* http://www.citi.umich.edu/techreports/reports/citi-tr-00-1.pdf
*
* Although a random odd number will do, it turns out that the golden
* ratio phi = (sqrt(5)-1)/2, or its negative, has particularly nice
* properties. (See Knuth vol 3, section 6.4, exercise 9.)
*
* These are the negative, (1 - phi) = phi**2 = (3 - sqrt(5))/2,
* which is very slightly easier to multiply by and makes no
* difference to the hash distribution.
*/
#define GOLDEN_RATIO_32 0x61C88647
#define GOLDEN_RATIO_64 0x61C8864680B583EBull
#ifdef CONFIG_HAVE_ARCH_HASH
/* This header may use the GOLDEN_RATIO_xx constants */
#include <asm/hash.h>
#endif
/*
* The _generic versions exist only so lib/test_hash.c can compare
* the arch-optimized versions with the generic.
*
* Note that if you change these, any <asm/hash.h> that aren't updated
* to match need to have their HAVE_ARCH_* define values updated so the
* self-test will not false-positive.
*/
#ifndef HAVE_ARCH__HASH_32
#define __hash_32 __hash_32_generic
#endif
static inline u32 __hash_32_generic(u32 val)
{
return val * GOLDEN_RATIO_32;
}
static inline u32 hash_32(u32 val, unsigned int bits)
{
/* High bits are more random, so use them. */
return __hash_32(val) >> (32 - bits);
}
#ifndef HAVE_ARCH_HASH_64
#define hash_64 hash_64_generic
#endif
static __always_inline u32 hash_64_generic(u64 val, unsigned int bits)
{
#if BITS_PER_LONG == 64
/* 64x64-bit multiply is efficient on all 64-bit processors */
return val * GOLDEN_RATIO_64 >> (64 - bits);
#else
/* Hash 64 bits using only 32x32-bit multiply. */
return hash_32((u32)val ^ __hash_32(val >> 32), bits);
#endif
}
static inline u32 hash_ptr(const void *ptr, unsigned int bits)
{
return hash_long((unsigned long)ptr, bits);
}
/* This really should be called fold32_ptr; it does no hashing to speak of. */
static inline u32 hash32_ptr(const void *ptr)
{
unsigned long val = (unsigned long)ptr;
#if BITS_PER_LONG == 64
val ^= (val >> 32);
#endif
return (u32)val;
}
#endif /* _LINUX_HASH_H */
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| sched | Folder | 0755 |
|
|
| unaligned | Folder | 0755 |
|
|
| align.h | File | 339 B | 0644 |
|
| arm-smccc.h | File | 5.63 KB | 0644 |
|
| atomic.h | File | 363 B | 0644 |
|
| bitfield.h | File | 5.33 KB | 0644 |
|
| bitmap.h | File | 4.82 KB | 0644 |
|
| bitops.h | File | 2.15 KB | 0644 |
|
| bits.h | File | 1.17 KB | 0644 |
|
| btf_ids.h | File | 5.97 KB | 0644 |
|
| bug.h | File | 442 B | 0644 |
|
| build_bug.h | File | 3.04 KB | 0644 |
|
| compiler-gcc.h | File | 1.24 KB | 0644 |
|
| compiler.h | File | 5.82 KB | 0644 |
|
| compiler_types.h | File | 1.09 KB | 0644 |
|
| const.h | File | 421 B | 0644 |
|
| coresight-pmu.h | File | 2.32 KB | 0644 |
|
| ctype.h | File | 1.9 KB | 0644 |
|
| debug_locks.h | File | 288 B | 0644 |
|
| delay.h | File | 117 B | 0644 |
|
| err.h | File | 1.99 KB | 0644 |
|
| export.h | File | 129 B | 0644 |
|
| filter.h | File | 9.59 KB | 0644 |
|
| find.h | File | 5.77 KB | 0644 |
|
| ftrace.h | File | 120 B | 0644 |
|
| gfp.h | File | 322 B | 0644 |
|
| gfp_types.h | File | 46 B | 0644 |
|
| hardirq.h | File | 280 B | 0644 |
|
| hash.h | File | 2.93 KB | 0644 |
|
| hashtable.h | File | 4.44 KB | 0644 |
|
| interrupt.h | File | 129 B | 0644 |
|
| interval_tree_generic.h | File | 6.7 KB | 0644 |
|
| irqflags.h | File | 1.37 KB | 0644 |
|
| jhash.h | File | 4.46 KB | 0644 |
|
| kallsyms.h | File | 646 B | 0644 |
|
| kconfig.h | File | 2.39 KB | 0644 |
|
| kern_levels.h | File | 954 B | 0644 |
|
| kernel.h | File | 2.64 KB | 0644 |
|
| linkage.h | File | 123 B | 0644 |
|
| list.h | File | 22.48 KB | 0644 |
|
| list_sort.h | File | 374 B | 0644 |
|
| lockdep.h | File | 1.43 KB | 0644 |
|
| log2.h | File | 4.46 KB | 0644 |
|
| math.h | File | 764 B | 0644 |
|
| math64.h | File | 1.22 KB | 0644 |
|
| module.h | File | 270 B | 0644 |
|
| mutex.h | File | 117 B | 0644 |
|
| nmi.h | File | 0 B | 0644 |
|
| numa.h | File | 292 B | 0644 |
|
| objtool_types.h | File | 1.8 KB | 0644 |
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| overflow.h | File | 4.11 KB | 0644 |
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| poison.h | File | 2.5 KB | 0644 |
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| proc_fs.h | File | 123 B | 0644 |
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| rbtree.h | File | 9.32 KB | 0644 |
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| rbtree_augmented.h | File | 9.34 KB | 0644 |
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| rcu.h | File | 437 B | 0644 |
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| refcount.h | File | 4.11 KB | 0644 |
|
| ring_buffer.h | File | 2.4 KB | 0644 |
|
| rwsem.h | File | 920 B | 0644 |
|
| seq_file.h | File | 126 B | 0644 |
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| sizes.h | File | 1.12 KB | 0644 |
|
| slab.h | File | 1.17 KB | 0644 |
|
| spinlock.h | File | 1.24 KB | 0644 |
|
| stacktrace.h | File | 678 B | 0644 |
|
| static_call_types.h | File | 2.74 KB | 0644 |
|
| string.h | File | 1.4 KB | 0644 |
|
| stringify.h | File | 380 B | 0644 |
|
| time64.h | File | 347 B | 0644 |
|
| types.h | File | 1.72 KB | 0644 |
|
| zalloc.h | File | 252 B | 0644 |
|