One way to do this, (even portably :-) is via displacement flushes.
Linus mentioned this.
Basically if you know the L2 cache size and the assosciativity you can
do this as long as you can get a "2 * L2 cache size * assosciativity"
piece of contiguous physical memory. When you need this "simon says"
flush, you basically read this physical memory span and this will
guarentee that all dirty data has exited the L2 cache.
David S. Miller
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