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    Subject[PATCH] add safe version of list_for_each_entry() to list.h
    From
    Date
    Please consider adding the following patch to list.h.

    The following patch adds list_for_each_entry_safe() and
    list_member() to list.h.

    - List_for_each_entry_safe adds a removal-safe version of this macro.
    - List_member indicates if the container object is currently in a list.

    Thanks.
    Mark

    diff -Naur old/include/linux/list.h new/include/linux/list.h
    --- old/include/linux/list.h Thu Oct 3 18:06:42 2002
    +++ new/include/linux/list.h Thu Oct 3 18:10:46 2002
    @@ -137,6 +137,15 @@
    return head->next == head;
    }

    +/**
    + * list_member - tests whether a list member is currently on a list
    + * @member: member to evaulate
    + */
    +static inline int list_member(struct list_head *member)
    +{
    + return ((!member->next || !member->prev) ? 0 : 1);
    +}
    +
    static inline void __list_splice(struct list_head *list,
    struct list_head *head)
    {
    @@ -241,6 +250,20 @@
    pos = list_entry(pos->member.next, typeof(*pos), member), \
    prefetch(pos->member.next))

    +/**
    + * list_for_each_entry_safe - iterate over list safe against removal of list entry
    + * @pos: the type * to use as a loop counter.
    + * @n: another type * to use as temporary storage
    + * @head: the head for your list.
    + * @member: the name of the list_struct within the struct.
    + */
    +#define list_for_each_entry_safe(pos, n, head, member) \
    + for (pos = list_entry((head)->next, typeof(*pos), member), \
    + n = list_entry(pos->member.next, typeof(*pos), member); \
    + &pos->member != (head); \
    + pos = n, \
    + n = list_entry(pos->member.next, typeof(*pos), member))
    +
    #endif /* __KERNEL__ || _LVM_H_INCLUDE */

    #endif

    -
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