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-rw-r--r--lib/list_sort.c4
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;