irqdomain: Simple NUMA awareness.

While common irqdesc allocation is node aware, the irqdomain code is not.

Presently we observe a number of regressions/inconsistencies on
NUMA-capable platforms:

- Platforms using irqdomains with legacy mappings, where the
  irq_descs are allocated node-local and the irqdomain data
  structure is not.

- Drivers implementing irqdomains will lose node locality
  regardless of the underlying struct device's node id.

This plugs in NUMA node id proliferation across the various allocation
callsites by way of_node_to_nid() node lookup. While of_node_to_nid()
does the right thing for OF-capable platforms it doesn't presently handle
the non-DT case. This is trivially dealt with by simply wraping in to
numa_node_id() unconditionally.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

include/linux/of.h

@@ -21,6 +21,7 @@
 #include <linux/kref.h>
 #include <linux/mod_devicetable.h>
 #include <linux/spinlock.h>
+#include <linux/topology.h>
 
 #include <asm/byteorder.h>
 #include <asm/errno.h>
@@ -158,11 +159,6 @@ static inline unsigned long of_read_ulong(const __be32 *cell, int size)
 
 #define OF_BAD_ADDR	((u64)-1)
 
-#ifndef of_node_to_nid
-static inline int of_node_to_nid(struct device_node *np) { return -1; }
-#define of_node_to_nid of_node_to_nid
-#endif
-
 static inline const char* of_node_full_name(struct device_node *np)
 {
 	return np ? np->full_name : "<no-node>";
@@ -412,6 +408,15 @@ static inline int of_machine_is_compatible(const char *compat)
 	while (0)
 #endif /* CONFIG_OF */
 
+#ifndef of_node_to_nid
+static inline int of_node_to_nid(struct device_node *np)
+{
+	return numa_node_id();
+}
+
+#define of_node_to_nid of_node_to_nid
+#endif
+
 /**
  * of_property_read_bool - Findfrom a property
  * @np:		device node from which the property value is to be read.