powerpc/mm: Fix encoding of page table cache numbers
authorBenjamin Herrenschmidt <benh@kernel.crashing.org>
Thu, 6 Aug 2009 03:50:58 +0000 (13:50 +1000)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Thu, 20 Aug 2009 00:25:12 +0000 (10:25 +1000)
The mask used to encode the page table cache number in the
batch when freeing page tables was too small for the new
possible values of MMU page sizes. This increases it along
with a comment explaining the constraints.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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