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list_nulls: add hlist_nulls_add_head and hlist_nulls_del

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This patch adds the hlist_nulls_add_head() function which is
based on hlist_nulls_add_head_rcu() but without the use of
rcu_assign_pointer(). It also adds hlist_nulls_del which is
exactly the same like hlist_nulls_del_rcu().

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Pablo Neira Ayuso 2009-06-13 12:28:57 +02:00 committed by Patrick McHardy
parent 9858a3ae1d
commit d219dce76c
1 changed files with 18 additions and 0 deletions
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18
include/linux/list_nulls.h
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@ -56,6 +56,18 @@ static inline int hlist_nulls_empty(const struct hlist_nulls_head *h)
return is_a_nulls(h->first); return is_a_nulls(h->first);
} }
static inline void hlist_nulls_add_head(struct hlist_nulls_node *n,
struct hlist_nulls_head *h)
{
struct hlist_nulls_node *first = h->first;
n->next = first;
n->pprev = &h->first;
h->first = n;
if (!is_a_nulls(first))
first->pprev = &n->next;
}
static inline void __hlist_nulls_del(struct hlist_nulls_node *n) static inline void __hlist_nulls_del(struct hlist_nulls_node *n)
{ {
struct hlist_nulls_node *next = n->next; struct hlist_nulls_node *next = n->next;
@ -65,6 +77,12 @@ static inline void __hlist_nulls_del(struct hlist_nulls_node *n)
next->pprev = pprev; next->pprev = pprev;
} }
static inline void hlist_nulls_del(struct hlist_nulls_node *n)
{
__hlist_nulls_del(n);
n->pprev = LIST_POISON2;
}
/** /**
* hlist_nulls_for_each_entry - iterate over list of given type * hlist_nulls_for_each_entry - iterate over list of given type
* @tpos: the type * to use as a loop cursor. * @tpos: the type * to use as a loop cursor.