Missing cache flush.

[Jamie Lokier]

David S. Miller wrote:
> 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.

Whether this works depends on the cache line replacement policy.  It
will always work with LRU, for example, and probably everything else
that exists.  But it is not guaranteed, is it?

-- Jamie