perf_counter: use list_move_tail()

Instead of del/add use a move list-op.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 4 deletions

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index b2e838959f3e..0fe22c916e29 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -89,8 +89,7 @@ list_del_counter(struct perf_counter *counter, struct perf_counter_context *ctx)
         list_for_each_entry_safe(sibling, tmp,
                                  &counter->sibling_list, list_entry) {
 
-                list_del_init(&sibling->list_entry);
-                list_add_tail(&sibling->list_entry, &ctx->counter_list);
+                list_move_tail(&sibling->list_entry, &ctx->counter_list);
                 sibling->group_leader = sibling;
         }
 }
@@ -959,8 +958,7 @@ static void rotate_ctx(struct perf_counter_context *ctx)
          */
         perf_flags = hw_perf_save_disable();
         list_for_each_entry(counter, &ctx->counter_list, list_entry) {
-                list_del(&counter->list_entry);
-                list_add_tail(&counter->list_entry, &ctx->counter_list);
+                list_move_tail(&counter->list_entry, &ctx->counter_list);
                 break;
         }
         hw_perf_restore(perf_flags);