sh: Tie sparseirq in to Kconfig.

Now that the dependent patches are merged, we are ready to enable
sparseirq support. This simply adds the Kconfig option, and then converts
from the _cpu to the _node allocation routines to follow the upstream
sparseirq API changes.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig

@@ -678,6 +678,18 @@ config GUSA_RB
 	  LLSC, this should be more efficient than the other alternative of
 	  disabling interrupts around the atomic sequence.
 
+config SPARSE_IRQ
+	bool "Support sparse irq numbering"
+	depends on EXPERIMENTAL
+	help
+	  This enables support for sparse irqs. This is useful in general
+	  as most CPUs have a fairly sparse array of IRQ vectors, which
+	  the irq_desc then maps directly on to. Systems with a high
+	  number of off-chip IRQs will want to treat this as
+	  experimental until they have been independently verified.
+
+	  If you don't know what to do here, say N.
+
 endmenu
 
 menu "Boot options"

arch/sh/kernel/cpu/irq/ipr.c

@@ -21,6 +21,7 @@
 #include <linux/module.h>
 #include <linux/io.h>
 #include <linux/interrupt.h>
+#include <linux/topology.h>
 
 static inline struct ipr_desc *get_ipr_desc(unsigned int irq)
 {
@@ -59,21 +60,17 @@ void register_ipr_controller(struct ipr_desc *desc)
 
 	for (i = 0; i < desc->nr_irqs; i++) {
 		struct ipr_data *p = desc->ipr_data + i;
-#ifdef CONFIG_SPARSE_IRQ
 		struct irq_desc *irq_desc;
-#endif
 
 		BUG_ON(p->ipr_idx >= desc->nr_offsets);
 		BUG_ON(!desc->ipr_offsets[p->ipr_idx]);
 
-#ifdef CONFIG_SPARSE_IRQ
-		irq_desc = irq_to_desc_alloc_cpu(p->irq, smp_processor_id());
+		irq_desc = irq_to_desc_alloc_node(p->irq, numa_node_id());
 		if (unlikely(!irq_desc)) {
 			printk(KERN_INFO "can not get irq_desc for %d\n",
 			       p->irq);
 			continue;
 		}
-#endif
 
 		disable_irq_nosync(p->irq);
 		set_irq_chip_and_handler_name(p->irq, &desc->chip,

drivers/sh/intc.c

@@ -24,6 +24,7 @@
 #include <linux/sh_intc.h>
 #include <linux/sysdev.h>
 #include <linux/list.h>
+#include <linux/topology.h>
 
 #define _INTC_MK(fn, mode, addr_e, addr_d, width, shift) \
 	((shift) | ((width) << 5) | ((fn) << 9) | ((mode) << 13) | \
@@ -671,7 +672,7 @@ unsigned int intc_evt2irq(unsigned int vector)
 
 void __init register_intc_controller(struct intc_desc *desc)
 {
-	unsigned int i, k, smp, cpu = smp_processor_id();
+	unsigned int i, k, smp;
 	struct intc_desc_int *d;
 
 	d = alloc_bootmem(sizeof(*d));
@@ -771,19 +772,16 @@ void __init register_intc_controller(struct intc_desc *desc)
 	for (i = 0; i < desc->nr_vectors; i++) {
 		struct intc_vect *vect = desc->vectors + i;
 		unsigned int irq = evt2irq(vect->vect);
-#ifdef CONFIG_SPARSE_IRQ
 		struct irq_desc *irq_desc;
-#endif
+
 		if (!vect->enum_id)
 			continue;
 
-#ifdef CONFIG_SPARSE_IRQ
-		irq_desc = irq_to_desc_alloc_cpu(irq, cpu);
+		irq_desc = irq_to_desc_alloc_node(irq, numa_node_id());
 		if (unlikely(!irq_desc)) {
 			printk(KERN_INFO "can not get irq_desc for %d\n", irq);
 			continue;
 		}
-#endif
 
 		intc_register_irq(desc, d, vect->enum_id, irq);
 	}