diff options
| -rw-r--r-- | lib/list_sort.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/list_sort.c b/lib/list_sort.c index a34c78c30d56..6b9fdaf1d32e 100644 --- a/lib/list_sort.c +++ b/lib/list_sort.c @@ -47,6 +47,7 @@ static void merge_and_restore_back_links(void *priv, struct list_head *a, struct list_head *b) { struct list_head *tail = head; + u8 count = 0; while (a && b) { /* if equal, take 'a' -- important for sort stability */ @@ -70,7 +71,8 @@ static void merge_and_restore_back_links(void *priv, * element comparison is needed, so the client's cmp() * routine can invoke cond_resched() periodically. */ - (*cmp)(priv, tail->next, tail->next); + if (unlikely(!(++count))) + (*cmp)(priv, tail->next, tail->next); tail->next->prev = tail; tail = tail->next; |