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update linux/list
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD
@@ -1,6 +1,9 @@
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#ifndef _LINUX_LIST_H
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#define _LINUX_LIST_H
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#include <linux/stddef.h>
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#include <linux/poison.h>
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#ifndef ARCH_HAS_PREFETCH
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#define ARCH_HAS_PREFETCH
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static inline void prefetch(const void *x) {;}
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@@ -25,9 +28,11 @@ struct list_head {
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#define LIST_HEAD(name) \
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struct list_head name = LIST_HEAD_INIT(name)
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#define INIT_LIST_HEAD(ptr) do { \
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(ptr)->next = (ptr); (ptr)->prev = (ptr); \
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} while (0)
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static inline void INIT_LIST_HEAD(struct list_head *list)
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{
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list->next = list;
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list->prev = list;
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}
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/*
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* Insert a new entry between two known consecutive entries.
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@@ -87,13 +92,37 @@ static inline void __list_del(struct list_head *prev, struct list_head *next)
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/**
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* list_del - deletes entry from list.
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* @entry: the element to delete from the list.
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* Note: list_empty on entry does not return true after this, the entry is in an undefined state.
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* Note: list_empty() on entry does not return true after this, the entry is
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* in an undefined state.
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*/
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static inline void list_del(struct list_head *entry)
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{
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__list_del(entry->prev, entry->next);
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entry->next = (void *) 0;
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entry->prev = (void *) 0;
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entry->next = LIST_POISON1;
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entry->prev = LIST_POISON2;
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}
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/**
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* list_replace - replace old entry by new one
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* @old : the element to be replaced
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* @new : the new element to insert
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*
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* If @old was empty, it will be overwritten.
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*/
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static inline void list_replace(struct list_head *old,
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struct list_head *new)
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{
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new->next = old->next;
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new->next->prev = new;
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new->prev = old->prev;
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new->prev->next = new;
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}
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static inline void list_replace_init(struct list_head *old,
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struct list_head *new)
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{
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list_replace(old, new);
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INIT_LIST_HEAD(old);
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}
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/**
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@@ -129,38 +158,130 @@ static inline void list_move_tail(struct list_head *list,
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list_add_tail(list, head);
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}
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/**
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* list_is_last - tests whether @list is the last entry in list @head
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* @list: the entry to test
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* @head: the head of the list
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*/
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static inline int list_is_last(const struct list_head *list,
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const struct list_head *head)
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{
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return list->next == head;
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}
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/**
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* list_empty - tests whether a list is empty
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* @head: the list to test.
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*/
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static inline int list_empty(struct list_head *head)
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static inline int list_empty(const struct list_head *head)
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{
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return head->next == head;
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}
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static inline void __list_splice(struct list_head *list,
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struct list_head *head)
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/**
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* list_empty_careful - tests whether a list is empty and not being modified
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* @head: the list to test
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*
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* Description:
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* tests whether a list is empty _and_ checks that no other CPU might be
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* in the process of modifying either member (next or prev)
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*
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* NOTE: using list_empty_careful() without synchronization
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* can only be safe if the only activity that can happen
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* to the list entry is list_del_init(). Eg. it cannot be used
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* if another CPU could re-list_add() it.
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*/
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static inline int list_empty_careful(const struct list_head *head)
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{
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struct list_head *first = list->next;
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struct list_head *last = list->prev;
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struct list_head *at = head->next;
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first->prev = head;
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head->next = first;
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last->next = at;
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at->prev = last;
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struct list_head *next = head->next;
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return (next == head) && (next == head->prev);
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}
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/**
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* list_splice - join two lists
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* list_is_singular - tests whether a list has just one entry.
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* @head: the list to test.
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*/
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static inline int list_is_singular(const struct list_head *head)
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{
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return !list_empty(head) && (head->next == head->prev);
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}
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static inline void __list_cut_position(struct list_head *list,
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struct list_head *head, struct list_head *entry)
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{
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struct list_head *new_first = entry->next;
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list->next = head->next;
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list->next->prev = list;
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list->prev = entry;
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entry->next = list;
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head->next = new_first;
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new_first->prev = head;
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}
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/**
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* list_cut_position - cut a list into two
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* @list: a new list to add all removed entries
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* @head: a list with entries
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* @entry: an entry within head, could be the head itself
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* and if so we won't cut the list
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*
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* This helper moves the initial part of @head, up to and
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* including @entry, from @head to @list. You should
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* pass on @entry an element you know is on @head. @list
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* should be an empty list or a list you do not care about
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* losing its data.
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*
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*/
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static inline void list_cut_position(struct list_head *list,
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struct list_head *head, struct list_head *entry)
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{
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if (list_empty(head))
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return;
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if (list_is_singular(head) &&
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(head->next != entry && head != entry))
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return;
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if (entry == head)
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INIT_LIST_HEAD(list);
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else
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__list_cut_position(list, head, entry);
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}
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static inline void __list_splice(const struct list_head *list,
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struct list_head *prev,
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struct list_head *next)
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{
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struct list_head *first = list->next;
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struct list_head *last = list->prev;
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first->prev = prev;
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prev->next = first;
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last->next = next;
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next->prev = last;
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}
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/**
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* list_splice - join two lists, this is designed for stacks
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* @list: the new list to add.
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* @head: the place to add it in the first list.
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*/
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static inline void list_splice(struct list_head *list, struct list_head *head)
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static inline void list_splice(const struct list_head *list,
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struct list_head *head)
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{
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if (!list_empty(list))
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__list_splice(list, head);
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__list_splice(list, head, head->next);
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}
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/**
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* list_splice_tail - join two lists, each list being a queue
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* @list: the new list to add.
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* @head: the place to add it in the first list.
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*/
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static inline void list_splice_tail(struct list_head *list,
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struct list_head *head)
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{
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if (!list_empty(list))
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__list_splice(list, head->prev, head);
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}
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/**
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@@ -174,7 +295,24 @@ static inline void list_splice_init(struct list_head *list,
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struct list_head *head)
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{
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if (!list_empty(list)) {
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__list_splice(list, head);
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__list_splice(list, head, head->next);
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INIT_LIST_HEAD(list);
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}
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}
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/**
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* list_splice_tail_init - join two lists and reinitialise the emptied list
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* @list: the new list to add.
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* @head: the place to add it in the first list.
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*
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* Each of the lists is a queue.
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* The list at @list is reinitialised
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*/
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static inline void list_splice_tail_init(struct list_head *list,
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struct list_head *head)
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{
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if (!list_empty(list)) {
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__list_splice(list, head->prev, head);
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INIT_LIST_HEAD(list);
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}
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}
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@@ -186,28 +324,53 @@ static inline void list_splice_init(struct list_head *list,
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* @member: the name of the list_struct within the struct.
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*/
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#define list_entry(ptr, type, member) \
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((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
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container_of(ptr, type, member)
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/**
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* list_first_entry - get the first element from a list
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* @ptr: the list head to take the element from.
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* @type: the type of the struct this is embedded in.
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* @member: the name of the list_struct within the struct.
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*
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* Note, that list is expected to be not empty.
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*/
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#define list_first_entry(ptr, type, member) \
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list_entry((ptr)->next, type, member)
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/**
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* list_for_each - iterate over a list
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* @pos: the &struct list_head to use as a loop counter.
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* @pos: the &struct list_head to use as a loop cursor.
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* @head: the head for your list.
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*/
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#define list_for_each(pos, head) \
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for (pos = (head)->next, prefetch(pos->next); pos != (head); \
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pos = pos->next, prefetch(pos->next))
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for (pos = (head)->next; prefetch(pos->next), pos != (head); \
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pos = pos->next)
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/**
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* __list_for_each - iterate over a list
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* @pos: the &struct list_head to use as a loop cursor.
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* @head: the head for your list.
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*
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* This variant differs from list_for_each() in that it's the
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* simplest possible list iteration code, no prefetching is done.
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* Use this for code that knows the list to be very short (empty
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* or 1 entry) most of the time.
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*/
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#define __list_for_each(pos, head) \
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for (pos = (head)->next; pos != (head); pos = pos->next)
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/**
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* list_for_each_prev - iterate over a list backwards
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* @pos: the &struct list_head to use as a loop counter.
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* @pos: the &struct list_head to use as a loop cursor.
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* @head: the head for your list.
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*/
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#define list_for_each_prev(pos, head) \
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for (pos = (head)->prev, prefetch(pos->prev); pos != (head); \
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pos = pos->prev, prefetch(pos->prev))
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for (pos = (head)->prev; prefetch(pos->prev), pos != (head); \
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pos = pos->prev)
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/**
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* list_for_each_safe - iterate over a list safe against removal of list entry
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* @pos: the &struct list_head to use as a loop counter.
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* list_for_each_safe - iterate over a list safe against removal of list entry
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* @pos: the &struct list_head to use as a loop cursor.
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* @n: another &struct list_head to use as temporary storage
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* @head: the head for your list.
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*/
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@@ -215,44 +378,297 @@ static inline void list_splice_init(struct list_head *list,
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for (pos = (head)->next, n = pos->next; pos != (head); \
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pos = n, n = pos->next)
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/**
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* list_for_each_prev_safe - iterate over a list backwards safe against removal of list entry
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* @pos: the &struct list_head to use as a loop cursor.
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* @n: another &struct list_head to use as temporary storage
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* @head: the head for your list.
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*/
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#define list_for_each_prev_safe(pos, n, head) \
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for (pos = (head)->prev, n = pos->prev; \
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prefetch(pos->prev), pos != (head); \
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pos = n, n = pos->prev)
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/**
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* list_for_each_entry - iterate over list of given type
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* @pos: the type * to use as a loop counter.
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* @pos: the type * to use as a loop cursor.
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* @head: the head for your list.
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* @member: the name of the list_struct within the struct.
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*/
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#define list_for_each_entry(pos, head, member) \
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for (pos = list_entry((head)->next, typeof(*pos), member), \
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prefetch(pos->member.next); \
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&pos->member != (head); \
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pos = list_entry(pos->member.next, typeof(*pos), member), \
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prefetch(pos->member.next))
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for (pos = list_entry((head)->next, typeof(*pos), member); \
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prefetch(pos->member.next), &pos->member != (head); \
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pos = list_entry(pos->member.next, typeof(*pos), member))
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/**
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* list_for_each_entry_reverse - iterate backwards over list of given type.
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* @pos: the type * to use as a loop cursor.
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* @head: the head for your list.
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* @member: the name of the list_struct within the struct.
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*/
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#define list_for_each_entry_reverse(pos, head, member) \
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for (pos = list_entry((head)->prev, typeof(*pos), member); \
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prefetch(pos->member.prev), &pos->member != (head); \
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pos = list_entry(pos->member.prev, typeof(*pos), member))
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/**
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* list_prepare_entry - prepare a pos entry for use in list_for_each_entry_continue()
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* @pos: the type * to use as a start point
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* @head: the head of the list
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* @member: the name of the list_struct within the struct.
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*
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* Prepares a pos entry for use as a start point in list_for_each_entry_continue().
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*/
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#define list_prepare_entry(pos, head, member) \
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((pos) ? : list_entry(head, typeof(*pos), member))
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/**
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* list_for_each_entry_continue - continue iteration over list of given type
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* @pos: the type * to use as a loop cursor.
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* @head: the head for your list.
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* @member: the name of the list_struct within the struct.
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*
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* Continue to iterate over list of given type, continuing after
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* the current position.
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*/
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#define list_for_each_entry_continue(pos, head, member) \
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for (pos = list_entry(pos->member.next, typeof(*pos), member); \
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prefetch(pos->member.next), &pos->member != (head); \
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pos = list_entry(pos->member.next, typeof(*pos), member))
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/**
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* list_for_each_entry_continue_reverse - iterate backwards from the given point
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* @pos: the type * to use as a loop cursor.
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* @head: the head for your list.
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* @member: the name of the list_struct within the struct.
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*
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* Start to iterate over list of given type backwards, continuing after
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* the current position.
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*/
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#define list_for_each_entry_continue_reverse(pos, head, member) \
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for (pos = list_entry(pos->member.prev, typeof(*pos), member); \
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prefetch(pos->member.prev), &pos->member != (head); \
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pos = list_entry(pos->member.prev, typeof(*pos), member))
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/**
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* list_for_each_entry_from - iterate over list of given type from the current point
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* @pos: the type * to use as a loop cursor.
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* @head: the head for your list.
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* @member: the name of the list_struct within the struct.
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*
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* Iterate over list of given type, continuing from current position.
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*/
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#define list_for_each_entry_from(pos, head, member) \
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for (; prefetch(pos->member.next), &pos->member != (head); \
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pos = list_entry(pos->member.next, typeof(*pos), member))
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|
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/**
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* list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
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* @pos: the type * to use as a loop counter.
|
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* @pos: the type * to use as a loop cursor.
|
||||
* @n: another type * to use as temporary storage
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* @head: the head for your list.
|
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* @member: the name of the list_struct within the struct.
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*/
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#define list_for_each_entry_safe(pos, n, head, member) \
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for (pos = list_entry((head)->next, typeof(*pos), member), \
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n = list_entry(pos->member.next, typeof(*pos), member); \
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&pos->member != (head); \
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n = list_entry(pos->member.next, typeof(*pos), member); \
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&pos->member != (head); \
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pos = n, n = list_entry(n->member.next, typeof(*n), member))
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|
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/**
|
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* list_for_each_entry_continue - iterate over list of given type
|
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* continuing after existing point
|
||||
* @pos: the type * to use as a loop counter.
|
||||
* list_for_each_entry_safe_continue
|
||||
* @pos: the type * to use as a loop cursor.
|
||||
* @n: another type * to use as temporary storage
|
||||
* @head: the head for your list.
|
||||
* @member: the name of the list_struct within the struct.
|
||||
*
|
||||
* Iterate over list of given type, continuing after current point,
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* safe against removal of list entry.
|
||||
*/
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||||
#define list_for_each_entry_continue(pos, head, member) \
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for (pos = list_entry(pos->member.next, typeof(*pos), member), \
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prefetch(pos->member.next); \
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&pos->member != (head); \
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pos = list_entry(pos->member.next, typeof(*pos), member), \
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prefetch(pos->member.next))
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#define list_for_each_entry_safe_continue(pos, n, head, member) \
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for (pos = list_entry(pos->member.next, typeof(*pos), member), \
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n = list_entry(pos->member.next, typeof(*pos), member); \
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||||
&pos->member != (head); \
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pos = n, n = list_entry(n->member.next, typeof(*n), member))
|
||||
|
||||
/**
|
||||
* list_for_each_entry_safe_from
|
||||
* @pos: the type * to use as a loop cursor.
|
||||
* @n: another type * to use as temporary storage
|
||||
* @head: the head for your list.
|
||||
* @member: the name of the list_struct within the struct.
|
||||
*
|
||||
* Iterate over list of given type from current point, safe against
|
||||
* removal of list entry.
|
||||
*/
|
||||
#define list_for_each_entry_safe_from(pos, n, head, member) \
|
||||
for (n = list_entry(pos->member.next, typeof(*pos), member); \
|
||||
&pos->member != (head); \
|
||||
pos = n, n = list_entry(n->member.next, typeof(*n), member))
|
||||
|
||||
/**
|
||||
* list_for_each_entry_safe_reverse
|
||||
* @pos: the type * to use as a loop cursor.
|
||||
* @n: another type * to use as temporary storage
|
||||
* @head: the head for your list.
|
||||
* @member: the name of the list_struct within the struct.
|
||||
*
|
||||
* Iterate backwards over list of given type, safe against removal
|
||||
* of list entry.
|
||||
*/
|
||||
#define list_for_each_entry_safe_reverse(pos, n, head, member) \
|
||||
for (pos = list_entry((head)->prev, typeof(*pos), member), \
|
||||
n = list_entry(pos->member.prev, typeof(*pos), member); \
|
||||
&pos->member != (head); \
|
||||
pos = n, n = list_entry(n->member.prev, typeof(*n), member))
|
||||
|
||||
/*
|
||||
* Double linked lists with a single pointer list head.
|
||||
* Mostly useful for hash tables where the two pointer list head is
|
||||
* too wasteful.
|
||||
* You lose the ability to access the tail in O(1).
|
||||
*/
|
||||
|
||||
struct hlist_head {
|
||||
struct hlist_node *first;
|
||||
};
|
||||
|
||||
struct hlist_node {
|
||||
struct hlist_node *next, **pprev;
|
||||
};
|
||||
|
||||
#define HLIST_HEAD_INIT { .first = NULL }
|
||||
#define HLIST_HEAD(name) struct hlist_head name = { .first = NULL }
|
||||
#define INIT_HLIST_HEAD(ptr) ((ptr)->first = NULL)
|
||||
static inline void INIT_HLIST_NODE(struct hlist_node *h)
|
||||
{
|
||||
h->next = NULL;
|
||||
h->pprev = NULL;
|
||||
}
|
||||
|
||||
static inline int hlist_unhashed(const struct hlist_node *h)
|
||||
{
|
||||
return !h->pprev;
|
||||
}
|
||||
|
||||
static inline int hlist_empty(const struct hlist_head *h)
|
||||
{
|
||||
return !h->first;
|
||||
}
|
||||
|
||||
static inline void __hlist_del(struct hlist_node *n)
|
||||
{
|
||||
struct hlist_node *next = n->next;
|
||||
struct hlist_node **pprev = n->pprev;
|
||||
*pprev = next;
|
||||
if (next)
|
||||
next->pprev = pprev;
|
||||
}
|
||||
|
||||
static inline void hlist_del(struct hlist_node *n)
|
||||
{
|
||||
__hlist_del(n);
|
||||
n->next = LIST_POISON1;
|
||||
n->pprev = LIST_POISON2;
|
||||
}
|
||||
|
||||
static inline void hlist_del_init(struct hlist_node *n)
|
||||
{
|
||||
if (!hlist_unhashed(n)) {
|
||||
__hlist_del(n);
|
||||
INIT_HLIST_NODE(n);
|
||||
}
|
||||
}
|
||||
|
||||
static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h)
|
||||
{
|
||||
struct hlist_node *first = h->first;
|
||||
n->next = first;
|
||||
if (first)
|
||||
first->pprev = &n->next;
|
||||
h->first = n;
|
||||
n->pprev = &h->first;
|
||||
}
|
||||
|
||||
/* next must be != NULL */
|
||||
static inline void hlist_add_before(struct hlist_node *n,
|
||||
struct hlist_node *next)
|
||||
{
|
||||
n->pprev = next->pprev;
|
||||
n->next = next;
|
||||
next->pprev = &n->next;
|
||||
*(n->pprev) = n;
|
||||
}
|
||||
|
||||
static inline void hlist_add_after(struct hlist_node *n,
|
||||
struct hlist_node *next)
|
||||
{
|
||||
next->next = n->next;
|
||||
n->next = next;
|
||||
next->pprev = &n->next;
|
||||
|
||||
if(next->next)
|
||||
next->next->pprev = &next->next;
|
||||
}
|
||||
|
||||
#define hlist_entry(ptr, type, member) container_of(ptr,type,member)
|
||||
|
||||
#define hlist_for_each(pos, head) \
|
||||
for (pos = (head)->first; pos && ({ prefetch(pos->next); 1; }); \
|
||||
pos = pos->next)
|
||||
|
||||
#define hlist_for_each_safe(pos, n, head) \
|
||||
for (pos = (head)->first; pos && ({ n = pos->next; 1; }); \
|
||||
pos = n)
|
||||
|
||||
/**
|
||||
* hlist_for_each_entry - iterate over list of given type
|
||||
* @tpos: the type * to use as a loop cursor.
|
||||
* @pos: the &struct hlist_node to use as a loop cursor.
|
||||
* @head: the head for your list.
|
||||
* @member: the name of the hlist_node within the struct.
|
||||
*/
|
||||
#define hlist_for_each_entry(tpos, pos, head, member) \
|
||||
for (pos = (head)->first; \
|
||||
pos && ({ prefetch(pos->next); 1;}) && \
|
||||
({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
|
||||
pos = pos->next)
|
||||
|
||||
/**
|
||||
* hlist_for_each_entry_continue - iterate over a hlist continuing after current point
|
||||
* @tpos: the type * to use as a loop cursor.
|
||||
* @pos: the &struct hlist_node to use as a loop cursor.
|
||||
* @member: the name of the hlist_node within the struct.
|
||||
*/
|
||||
#define hlist_for_each_entry_continue(tpos, pos, member) \
|
||||
for (pos = (pos)->next; \
|
||||
pos && ({ prefetch(pos->next); 1;}) && \
|
||||
({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
|
||||
pos = pos->next)
|
||||
|
||||
/**
|
||||
* hlist_for_each_entry_from - iterate over a hlist continuing from current point
|
||||
* @tpos: the type * to use as a loop cursor.
|
||||
* @pos: the &struct hlist_node to use as a loop cursor.
|
||||
* @member: the name of the hlist_node within the struct.
|
||||
*/
|
||||
#define hlist_for_each_entry_from(tpos, pos, member) \
|
||||
for (; pos && ({ prefetch(pos->next); 1;}) && \
|
||||
({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
|
||||
pos = pos->next)
|
||||
|
||||
/**
|
||||
* hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry
|
||||
* @tpos: the type * to use as a loop cursor.
|
||||
* @pos: the &struct hlist_node to use as a loop cursor.
|
||||
* @n: another &struct hlist_node to use as temporary storage
|
||||
* @head: the head for your list.
|
||||
* @member: the name of the hlist_node within the struct.
|
||||
*/
|
||||
#define hlist_for_each_entry_safe(tpos, pos, n, head, member) \
|
||||
for (pos = (head)->first; \
|
||||
pos && ({ n = pos->next; 1; }) && \
|
||||
({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
|
||||
pos = n)
|
||||
|
||||
#endif
|
||||
|
||||
11
include/linux/poison.h
Normal file
11
include/linux/poison.h
Normal file
@@ -0,0 +1,11 @@
|
||||
#ifndef _LINUX_POISON_H
|
||||
#define _LINUX_POISON_H
|
||||
|
||||
/********** include/linux/list.h **********/
|
||||
/*
|
||||
* used to verify that nobody uses non-initialized list entries.
|
||||
*/
|
||||
#define LIST_POISON1 ((void *) 0x0)
|
||||
#define LIST_POISON2 ((void *) 0x0)
|
||||
|
||||
#endif
|
||||
Reference in New Issue
Block a user