sparc64 address-congruence property

The Machine Description (MD) property "address-congruence-offset" is
optional. According to the MD specification the value is assumed 0UL when
not present. This caused early boot failure on T5.

Signed-off-by: Bob Picco <bob.picco@oracle.com>
CC: sparclinux@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index a7171997adfdd4b7b5bf9154528b94c31b0a3bb3..04fd55a6e4613ae009d6f53abce4fbf3f043bc8e 100644 (file)
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -1098,7 +1098,14 @@ static int __init grab_mblocks(struct mdesc_handle *md)
                m->size = *val;
                val = mdesc_get_property(md, node,
                                         "address-congruence-offset", NULL);
-               m->offset = *val;
+
+               /* The address-congruence-offset property is optional.
+                * Explicity zero it be identifty this.
+                */
+               if (val)
+                       m->offset = *val;
+               else
+                       m->offset = 0UL;
 
                numadbg("MBLOCK[%d]: base[%llx] size[%llx] offset[%llx]\n",
                        count - 1, m->base, m->size, m->offset);