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系统运行时,如何规避A7的L2 Cache对系统性能影响

目前想评估A7的L2 Cache对某些精简版Android系统性能影响,但是由于L1 D-cache与L2 cache公用一个使能位,当L1 d-cache使能后,L2 cache也必然使能;

所以,想请教如何在内核中使能L2 cache,但是L2 cache不起作用,前提是L1 D-cache依然有用。