On Thu, 2012-06-28 at 13:05 +0200, Peter Zijlstra wrote:

quoted

Some embedded ppc's know about the lowest level (SW loaded PMD) but
that's not an issue here. We flush these special TLB entries
specifically and synchronously in __pte_free_tlb().

OK, I missed that.. is that
arch/powerpc/mm/tlb_nohash.c:tlb_flush_pgtable() ?

Yup.

quoted

quoted

So even if the hardware did do speculative tlb fills, it would do

them

quoted

quoted

from the hash-table, but that's already cleared out.

Right,

Phew at least I got the important thing right ;-)

Yeah as long as we have that hash :-) The day we move on (if ever) it
will be as bad as ARM :-)

Cheers,
Ben.


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