powerpc/pseries: Revert support for ibm,drc-info devtree property

This reverts commit 6cebf17929c8b8de217babe7d7cd7f45550cff41.

The earlier patch tried to enable support for a new property
"ibm,drc-info" on powerpc systems.

Unfortunately, some errors in the associated patch set break things
in some of the DLPAR operations.  In particular when attempting to
hot-add a new CPU or set of CPUs, the original patch failed to
properly calculate the available resources, and aborted the operation.
In addition, the original set missed several opportunities to compress
and reuse common code.

As the associated patch set was meant to provide an optimization of
storage and performance of a set of device-tree properties for future
systems with large amounts of resources, reverting just restores
the previous behavior for existing systems.  It seems unnecessary
to enable this feature and introduce the consequent problems in the
field that it will cause at this time, so please revert it for now
until testing of the corrections are finished properly.

Fixes: 6cebf17929c8 ("powerpc: Enable support for ibm,drc-info devtree property")
Signed-off-by: Michael W. Bringmann <mwb@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index adf044daafd763a544685b92f60dbe434cc64f90..d22c41c26bb309f7e5319994dab91c60eff3e14f 100644 (file)
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -874,7 +874,7 @@ struct ibm_arch_vec __cacheline_aligned ibm_architecture_vec = {
                .mmu = 0,
                .hash_ext = 0,
                .radix_ext = 0,
-               .byte22 = OV5_FEAT(OV5_DRC_INFO),
+               .byte22 = 0,
        },
 
        /* option vector 6: IBM PAPR hints */