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Subject[PATCH 04/11] 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>
---
kernel/perf_counter.c | 6 ++----
1 file changed, 2 insertions(+), 4 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;
}
}
@@ -959,8 +958,7 @@ static void rotate_ctx(struct perf_count
*/
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);
--



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