linux-kernel - [24/84] sparc64 address-congruence property

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Message-ID: <lsq.1375276989.298370057@decadent.org.uk>
Date:	Wed, 31 Jul 2013 15:23:09 +0200
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, sparclinux@...r.kernel.org,
	"Bob Picco" <bob.picco@...cle.com>,
	"bob picco" <bpicco@...oft.net>,
	"David S. Miller" <davem@...emloft.net>
Subject: [24/84] sparc64 address-congruence property

3.2.50-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: bob picco <bpicco@...oft.net>

commit 771a37ff4d80b80db3b0df3e7696f14b298c67b7 upstream.

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@...cle.com>
CC: sparclinux@...r.kernel.org
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/sparc/mm/init_64.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index 6ff4d78..b4989f9 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -1071,7 +1071,14 @@ 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);

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