[PATCH] powerpc: Minor numa memory code cleanup

Here is an updated version of the patch that panics if no memory is
found as Nathan suggested.  I'm still concerned that panic strings
(not just the one added here) at this stage of booting do not show
up on my system.  But, that is an issue separate from this patch.

Combine get_mem_*_cells() routines to avoid multiple memory node
lookups.  Added missing of_node_put() call.  Changed variable names
to help with some confusion as to meaning.

Signed-off-by: Mike Kravetz <kravetz@us.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/mm/numa.c

@@ -254,29 +254,17 @@ static int __init find_min_common_depth(void)
 	return depth;
 }
 
-static int __init get_mem_addr_cells(void)
+static void __init get_n_mem_cells(int *n_addr_cells, int *n_size_cells)
 {
 	struct device_node *memory = NULL;
-	int rc;
 
 	memory = of_find_node_by_type(memory, "memory");
 	if (!memory)
-		return 0; /* it won't matter */
+		panic("numa.c: No memory nodes found!");
 
-	rc = prom_n_addr_cells(memory);
-	return rc;
-}
-
-static int __init get_mem_size_cells(void)
-{
-	struct device_node *memory = NULL;
-	int rc;
-
-	memory = of_find_node_by_type(memory, "memory");
-	if (!memory)
-		return 0; /* it won't matter */
-	rc = prom_n_size_cells(memory);
-	return rc;
+	*n_addr_cells = prom_n_addr_cells(memory);
+	*n_size_cells = prom_n_size_cells(memory);
+	of_node_put(memory);
 }
 
 static unsigned long __init read_n_cells(int n, unsigned int **buf)
@@ -386,7 +374,7 @@ static int __init parse_numa_properties(void)
 {
 	struct device_node *cpu = NULL;
 	struct device_node *memory = NULL;
-	int addr_cells, size_cells;
+	int n_addr_cells, n_size_cells;
 	int max_domain;
 	unsigned long i;
 
@@ -425,8 +413,7 @@ static int __init parse_numa_properties(void)
 		}
 	}
 
-	addr_cells = get_mem_addr_cells();
-	size_cells = get_mem_size_cells();
+	get_n_mem_cells(&n_addr_cells, &n_size_cells);
 	memory = NULL;
 	while ((memory = of_find_node_by_type(memory, "memory")) != NULL) {
 		unsigned long start;
@@ -443,8 +430,8 @@ static int __init parse_numa_properties(void)
 		ranges = memory->n_addrs;
 new_range:
 		/* these are order-sensitive, and modify the buffer pointer */
-		start = read_n_cells(addr_cells, &memcell_buf);
-		size = read_n_cells(size_cells, &memcell_buf);
+		start = read_n_cells(n_addr_cells, &memcell_buf);
+		size = read_n_cells(n_size_cells, &memcell_buf);
 
 		numa_domain = of_node_numa_domain(memory);