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powerpc/pseries/ddw: Revert "Extend upper limit for huge DMA window for persistent memory"

Steve Best requested to merge sfbest/centos-stream-9:2056057 into main

Bugzilla: http://bugzilla.redhat.com/2056057

Build Info: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=43783440

Tested: Successfully tested by IBM. I did sanity boot testing on power 9 (ibm-p9z-06-lp10).

commit 2d33f5504490a9d90924476dbccd4a5349ee1ad0 Author: Alexey Kardashevskiy aik@ozlabs.ru Date: Mon Nov 8 15:03:17 2021 +1100

powerpc/pseries/ddw: Revert "Extend upper limit for huge DMA window for persistent memory"

This reverts commit 54fc3c681ded9437e4548e2501dc1136b23cfa9a
which does not allow 1:1 mapping even for the system RAM which
is usually possible.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211108040320.3857636-2-aik@ozlabs.ru

Signed-off-by: Steve Best sbest@redhat.com

Edited by Steve Best

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