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

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
 kernel/perf_counter.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

Index: linux-2.6/kernel/perf_counter.c
===================================================================
--- linux-2.6.orig/kernel/perf_counter.c
+++ linux-2.6/kernel/perf_counter.c
@@ -89,8 +89,7 @@ list_del_counter(struct perf_counter *co
 	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;
 	}
 }

--