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    SubjectRe: [PATCH] add safe version of list_for_each_entry() to list.h
    Date
    On Friday 04 October 2002 08:58, Christoph Hellwig wrote:
    > > + */
    > > +#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))
    >
    > Identation looks a little strange..

    Dammit. Forgot to insert the patch. Here goes again.

    --
    Kevin Corry
    corryk@us.ibm.com
    http://evms.sourceforge.net/

    ======================================================
    diff -Naur linux-2.5.40a/include/linux/list.h linux-2.5.40b/include/linux/list.h
    --- linux-2.5.40a/include/linux/list.h Fri Oct 4 08:45:54 2002
    +++ linux-2.5.40b/include/linux/list.h Fri Oct 4 08:45:31 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;
    +}
    +
    static inline void __list_splice(struct list_head *list,
    struct list_head *head)
    {
    @@ -240,6 +249,20 @@
    &pos->member != (head); \
    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 */

    -
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