[IA64-SGI] fix bogus address dereference in sn/setup.c

Some code in sn/setup.c was trying to dereference a physical address, which
usually doesn't work (esp. not with the region register init patch I posted).
This patch converts the function used to find the klconfig to return virtual
char * instead of a physical address and updates the caller to deal with it.
Signed-off-by: Jesse Barnes <jbarnes@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/sn/kernel/setup.c

@@ -505,15 +505,15 @@ static void __init scan_for_ionodes(void)
 
 	/* Setup ionodes with memory */
 	for (nasid = 0; nasid < MAX_PHYSNODE_ID; nasid += 2) {
-		u64 klgraph_header;
+		char *klgraph_header;
 		cnodeid_t cnodeid;
 
 		if (physical_node_map[nasid] == -1)
 			continue;
 
-		klgraph_header = cnodeid = -1;
-		klgraph_header = ia64_sn_get_klconfig_addr(nasid);
-		if (klgraph_header <= 0) {
+		cnodeid = -1;
+		klgraph_header = __va(ia64_sn_get_klconfig_addr(nasid));
+		if (!klgraph_header) {
 			if (IS_RUNNING_ON_SIMULATOR())
 				continue;
 			BUG();	/* All nodes must have klconfig tables! */

include/asm-ia64/sn/sn_sal.h

@@ -203,7 +203,7 @@ ia64_sn_get_master_baseio_nasid(void)
 	return ret_stuff.v0;
 }
 
-static inline u64
+static inline char *
 ia64_sn_get_klconfig_addr(nasid_t nasid)
 {
 	struct ia64_sal_retval ret_stuff;
@@ -223,7 +223,7 @@ ia64_sn_get_klconfig_addr(nasid_t nasid)
 	if (ret_stuff.status != 0) {
 		panic("ia64_sn_get_klconfig_addr: Returned error %lx\n", ret_stuff.status);
 	}
-	return(ret_stuff.v0);
+	return ret_stuff.v0 ? __va(ret_stuff.v0) : NULL;
 }
 
 /*