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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Statically sized hash table implementation
* (C) 2012 Sasha Levin <levinsasha928@gmail.com>
*/
#ifndef _LINUX_HASHTABLE_H
#define _LINUX_HASHTABLE_H
#include <linux/list.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/bitops.h>
#include <linux/hash.h>
#include <linux/log2.h>
#define DEFINE_HASHTABLE(name, bits) \
struct hlist_head name[1 << (bits)] = \
{ [0 ... ((1 << (bits)) - 1)] = HLIST_HEAD_INIT }
#define DECLARE_HASHTABLE(name, bits) \
struct hlist_head name[1 << (bits)]
#define HASH_SIZE(name) (ARRAY_SIZE(name))
#define HASH_BITS(name) ilog2(HASH_SIZE(name))
/* Use hash_32 when possible to allow for fast 32bit hashing in 64bit kernels. */
#define hash_min(val, bits) \
(sizeof(val) <= 4 ? hash_32(val, bits) : hash_long(val, bits))
static inline void __hash_init(struct hlist_head *ht, unsigned int sz)
{
unsigned int i;
for (i = 0; i < sz; i++)
INIT_HLIST_HEAD(&ht[i]);
}
/**
* hash_init - initialize a hash table
* @hashtable: hashtable to be initialized
*
* Calculates the size of the hashtable from the given parameter, otherwise
* same as hash_init_size.
*
* This has to be a macro since HASH_BITS() will not work on pointers since
* it calculates the size during preprocessing.
*/
#define hash_init(hashtable) __hash_init(hashtable, HASH_SIZE(hashtable))
/**
* hash_add - add an object to a hashtable
* @hashtable: hashtable to add to
* @node: the &struct hlist_node of the object to be added
* @key: the key of the object to be added
*/
#define hash_add(hashtable, node, key) \
hlist_add_head(node, &hashtable[hash_min(key, HASH_BITS(hashtable))])
/**
* hash_hashed - check whether an object is in any hashtable
* @node: the &struct hlist_node of the object to be checked
*/
static inline bool hash_hashed(struct hlist_node *node)
{
return !hlist_unhashed(node);
}
static inline bool __hash_empty(struct hlist_head *ht, unsigned int sz)
{
unsigned int i;
for (i = 0; i < sz; i++)
if (!hlist_empty(&ht[i]))
return false;
return true;
}
/**
* hash_empty - check whether a hashtable is empty
* @hashtable: hashtable to check
*
* This has to be a macro since HASH_BITS() will not work on pointers since
* it calculates the size during preprocessing.
*/
#define hash_empty(hashtable) __hash_empty(hashtable, HASH_SIZE(hashtable))
/**
* hash_del - remove an object from a hashtable
* @node: &struct hlist_node of the object to remove
*/
static inline void hash_del(struct hlist_node *node)
{
hlist_del_init(node);
}
/**
* hash_for_each - iterate over a hashtable
* @name: hashtable to iterate
* @bkt: integer to use as bucket loop cursor
* @obj: the type * to use as a loop cursor for each entry
* @member: the name of the hlist_node within the struct
*/
#define hash_for_each(name, bkt, obj, member) \
for ((bkt) = 0, obj = NULL; obj == NULL && (bkt) < HASH_SIZE(name);\
(bkt)++)\
hlist_for_each_entry(obj, &name[bkt], member)
/**
* hash_for_each_safe - iterate over a hashtable safe against removal of
* hash entry
* @name: hashtable to iterate
* @bkt: integer to use as bucket loop cursor
* @tmp: a &struct used for temporary storage
* @obj: the type * to use as a loop cursor for each entry
* @member: the name of the hlist_node within the struct
*/
#define hash_for_each_safe(name, bkt, tmp, obj, member) \
for ((bkt) = 0, obj = NULL; obj == NULL && (bkt) < HASH_SIZE(name);\
(bkt)++)\
hlist_for_each_entry_safe(obj, tmp, &name[bkt], member)
/**
* hash_for_each_possible - iterate over all possible objects hashing to the
* same bucket
* @name: hashtable to iterate
* @obj: the type * to use as a loop cursor for each entry
* @member: the name of the hlist_node within the struct
* @key: the key of the objects to iterate over
*/
#define hash_for_each_possible(name, obj, member, key) \
hlist_for_each_entry(obj, &name[hash_min(key, HASH_BITS(name))], member)
/**
* hash_for_each_possible_safe - iterate over all possible objects hashing to the
* same bucket safe against removals
* @name: hashtable to iterate
* @obj: the type * to use as a loop cursor for each entry
* @tmp: a &struct used for temporary storage
* @member: the name of the hlist_node within the struct
* @key: the key of the objects to iterate over
*/
#define hash_for_each_possible_safe(name, obj, tmp, member, key) \
hlist_for_each_entry_safe(obj, tmp,\
&name[hash_min(key, HASH_BITS(name))], member)
#endif
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| sched | Folder | 0755 |
|
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| unaligned | Folder | 0755 |
|
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| align.h | File | 339 B | 0644 |
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| arm-smccc.h | File | 5.63 KB | 0644 |
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| atomic.h | File | 363 B | 0644 |
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| bitfield.h | File | 5.33 KB | 0644 |
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| bitmap.h | File | 4.82 KB | 0644 |
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| bitops.h | File | 2.15 KB | 0644 |
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| bits.h | File | 1.17 KB | 0644 |
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| btf_ids.h | File | 5.97 KB | 0644 |
|
| bug.h | File | 442 B | 0644 |
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| build_bug.h | File | 3.04 KB | 0644 |
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| compiler-gcc.h | File | 1.24 KB | 0644 |
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| compiler.h | File | 5.82 KB | 0644 |
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| compiler_types.h | File | 1.09 KB | 0644 |
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| const.h | File | 421 B | 0644 |
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| coresight-pmu.h | File | 2.32 KB | 0644 |
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| ctype.h | File | 1.9 KB | 0644 |
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| debug_locks.h | File | 288 B | 0644 |
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| delay.h | File | 117 B | 0644 |
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| err.h | File | 1.99 KB | 0644 |
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| export.h | File | 129 B | 0644 |
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| filter.h | File | 9.59 KB | 0644 |
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| find.h | File | 5.77 KB | 0644 |
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| ftrace.h | File | 120 B | 0644 |
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| gfp.h | File | 322 B | 0644 |
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| gfp_types.h | File | 46 B | 0644 |
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| hardirq.h | File | 280 B | 0644 |
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| hash.h | File | 2.93 KB | 0644 |
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| hashtable.h | File | 4.44 KB | 0644 |
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| interrupt.h | File | 129 B | 0644 |
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| interval_tree_generic.h | File | 6.7 KB | 0644 |
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| irqflags.h | File | 1.37 KB | 0644 |
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| jhash.h | File | 4.46 KB | 0644 |
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| kallsyms.h | File | 646 B | 0644 |
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| kconfig.h | File | 2.39 KB | 0644 |
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| kern_levels.h | File | 954 B | 0644 |
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| kernel.h | File | 2.64 KB | 0644 |
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| linkage.h | File | 123 B | 0644 |
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| list.h | File | 22.48 KB | 0644 |
|
| list_sort.h | File | 374 B | 0644 |
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| lockdep.h | File | 1.43 KB | 0644 |
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| log2.h | File | 4.46 KB | 0644 |
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| math.h | File | 764 B | 0644 |
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| math64.h | File | 1.22 KB | 0644 |
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| module.h | File | 270 B | 0644 |
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| mutex.h | File | 117 B | 0644 |
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| nmi.h | File | 0 B | 0644 |
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| numa.h | File | 292 B | 0644 |
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| 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 |
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| ring_buffer.h | File | 2.4 KB | 0644 |
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| rwsem.h | File | 920 B | 0644 |
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| seq_file.h | File | 126 B | 0644 |
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| sizes.h | File | 1.12 KB | 0644 |
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| slab.h | File | 1.17 KB | 0644 |
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| spinlock.h | File | 1.24 KB | 0644 |
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| stacktrace.h | File | 678 B | 0644 |
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| static_call_types.h | File | 2.74 KB | 0644 |
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| string.h | File | 1.4 KB | 0644 |
|
| stringify.h | File | 380 B | 0644 |
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| time64.h | File | 347 B | 0644 |
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| types.h | File | 1.72 KB | 0644 |
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| zalloc.h | File | 252 B | 0644 |
|