rculist_nulls.h

Go to the documentation of this file.

#ifndef _LINUX_RCULIST_NULLS_H
#define _LINUX_RCULIST_NULLS_H

#ifdef __KERNEL__

/*
 * RCU-protected list version
 */
#include <linux/list_nulls.h>
#include <linux/rcupdate.h>

static inline void hlist_nulls_del_init_rcu(struct hlist_nulls_node *n)
{
    if (!hlist_nulls_unhashed(n)) {
        __hlist_nulls_del(n);
        n->pprev = NULL;
    }
}

#define hlist_nulls_first_rcu(head) \
    (*((struct hlist_nulls_node __rcu __force **)&(head)->first))

#define hlist_nulls_next_rcu(node) \
    (*((struct hlist_nulls_node __rcu __force **)&(node)->next))

static inline void hlist_nulls_del_rcu(struct hlist_nulls_node *n)
{
    __hlist_nulls_del(n);
    n->pprev = LIST_POISON2;
}

static inline void hlist_nulls_add_head_rcu(struct hlist_nulls_node *n,
                    struct hlist_nulls_head *h)
{
    struct hlist_nulls_node *first = h->first;

    n->next = first;
    n->pprev = &h->first;
    rcu_assign_pointer(hlist_nulls_first_rcu(h), n);
    if (!is_a_nulls(first))
        first->pprev = &n->next;
}
#define hlist_nulls_for_each_entry_rcu(tpos, pos, head, member)         \
    for (pos = rcu_dereference_raw(hlist_nulls_first_rcu(head));        \
        (!is_a_nulls(pos)) &&                       \
        ({ tpos = hlist_nulls_entry(pos, typeof(*tpos), member); 1; }); \
        pos = rcu_dereference_raw(hlist_nulls_next_rcu(pos)))

#endif
#endif