sgi-xp: isolate xpc_vars_part structure to sn2 only

Isolate the xpc_vars_part structure of XPC's reserved page to sn2 only.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/misc/sgi-xp/xpc_partition.c b/drivers/misc/sgi-xp/xpc_partition.c
index 1db84cb..be5b754 100644
--- a/drivers/misc/sgi-xp/xpc_partition.c
+++ b/drivers/misc/sgi-xp/xpc_partition.c
@@ -486,6 +486,7 @@
 	dev_dbg(xpc_part, "  last_heartbeat = 0x%016lx\n",
 		part->last_heartbeat);
 
+/* >>> remote_vars_part_pa and vars_part_pa are sn2 only!!! */
 	part->remote_vars_part_pa = remote_vars->vars_part_pa;
 	dev_dbg(xpc_part, "  remote_vars_part_pa = 0x%016lx\n",
 		part->remote_vars_part_pa);