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>
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@ -89,8 +89,7 @@ list_del_counter(struct perf_counter *counter, struct perf_counter_context *ctx)
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list_for_each_entry_safe(sibling, tmp,
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&counter->sibling_list, list_entry) {
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list_del_init(&sibling->list_entry);
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list_add_tail(&sibling->list_entry, &ctx->counter_list);
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list_move_tail(&sibling->list_entry, &ctx->counter_list);
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sibling->group_leader = sibling;
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}
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}
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@ -959,8 +958,7 @@ static void rotate_ctx(struct perf_counter_context *ctx)
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*/
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perf_flags = hw_perf_save_disable();
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list_for_each_entry(counter, &ctx->counter_list, list_entry) {
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list_del(&counter->list_entry);
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list_add_tail(&counter->list_entry, &ctx->counter_list);
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list_move_tail(&counter->list_entry, &ctx->counter_list);
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break;
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}
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hw_perf_restore(perf_flags);
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