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    Subject[patch 4 11/22] hlist: Add hlist_is_singular_node() helper
    Required to figure out whether the entry is the only one in the hlist.

    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Reviewed-by: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Chris Mason <clm@fb.com>
    Cc: Eric Dumazet <edumazet@google.com>
    Cc: rt@linutronix.de
    Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
    Cc: Arjan van de Ven <arjan@infradead.org>

    ---
    include/linux/list.h | 10 ++++++++++
    1 file changed, 10 insertions(+)

    --- a/include/linux/list.h
    +++ b/include/linux/list.h
    @@ -679,6 +679,16 @@ static inline bool hlist_fake(struct hli
    }

    /*
    + * Check whether the node is the only node of the head without
    + * accessing head.
    + */
    +static inline bool hlist_is_singular_node(struct hlist_node *n,
    + struct hlist_head *h)
    +{
    + return !n->next && n->pprev == &h->first;
    +}
    +
    +/*
    * Move a list from one list head to another. Fixup the pprev
    * reference of the first entry if it exists.
    */

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