diff options
author | Thomas Gleixner <[email protected]> | 2016-07-04 09:50:27 +0000 |
---|---|---|
committer | Ingo Molnar <[email protected]> | 2016-07-07 10:35:07 +0200 |
commit | 15dba1e37b5cfd7fab9bc84e0f05f35c918f4eef (patch) | |
tree | 9388b6b0c3347e48f4abfa59e35fe4bcde22bcc3 | |
parent | 2b1ecc3d1a6b10f8fbac7f83d80db30b5a2c2791 (diff) |
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 <[email protected]>
Reviewed-by: Frederic Weisbecker <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Cc: Chris Mason <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: George Spelvin <[email protected]>
Cc: Josh Triplett <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
-rw-r--r-- | include/linux/list.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/list.h b/include/linux/list.h index 5356f4d661a7..5183138aa932 100644 --- a/include/linux/list.h +++ b/include/linux/list.h @@ -679,6 +679,16 @@ static inline bool hlist_fake(struct hlist_node *h) } /* + * 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. */ |