MN10300: cleanup IRQ affinity setting

The irq_set_affinity handler for the mn10300 cpu pic had some hard-coded IRQs
which were not to be migrated from one cpu to another. This patch cleans those
up by using a combination of IRQF_NOBALANCING and specialized irq chips with
no irq_set_affinity handler. This maintains the previous behavior by using
generic IRQ interfaces rather than hard coding IRQ numbers in the default
irq_set_affinity handler.

Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>

3 files changed, 17 insertions, 52 deletions

diff --git a/arch/mn10300/kernel/irq.c b/arch/mn10300/kernel/irq.c
index 35932a8de8b..6ab3b73efcf 100644
--- a/arch/mn10300/kernel/irq.c
+++ b/arch/mn10300/kernel/irq.c
@@ -142,57 +142,11 @@ mn10300_cpupic_setaffinity(struct irq_data *d, const struct cpumask *mask,
                            bool force)
 {
         unsigned long flags;
-        int err;
 
         flags = arch_local_cli_save();
-
-        /* check irq no */
-        switch (d->irq) {
-        case TMJCIRQ:
-        case RESCHEDULE_IPI:
-        case CALL_FUNC_SINGLE_IPI:
-        case LOCAL_TIMER_IPI:
-        case FLUSH_CACHE_IPI:
-        case CALL_FUNCTION_NMI_IPI:
-        case DEBUGGER_NMI_IPI:
-#ifdef CONFIG_MN10300_TTYSM0
-        case SC0RXIRQ:
-        case SC0TXIRQ:
-#ifdef CONFIG_MN10300_TTYSM0_TIMER8
-        case TM8IRQ:
-#elif CONFIG_MN10300_TTYSM0_TIMER2
-        case TM2IRQ:
-#endif /* CONFIG_MN10300_TTYSM0_TIMER8 */
-#endif /* CONFIG_MN10300_TTYSM0 */
-
-#ifdef CONFIG_MN10300_TTYSM1
-        case SC1RXIRQ:
-        case SC1TXIRQ:
-#ifdef CONFIG_MN10300_TTYSM1_TIMER12
-        case TM12IRQ:
-#elif defined(CONFIG_MN10300_TTYSM1_TIMER9)
-        case TM9IRQ:
-#elif defined(CONFIG_MN10300_TTYSM1_TIMER3)
-        case TM3IRQ:
-#endif /* CONFIG_MN10300_TTYSM1_TIMER12 */
-#endif /* CONFIG_MN10300_TTYSM1 */
-
-#ifdef CONFIG_MN10300_TTYSM2
-        case SC2RXIRQ:
-        case SC2TXIRQ:
-        case TM10IRQ:
-#endif /* CONFIG_MN10300_TTYSM2 */
-                err = -1;
-                break;
-
-        default:
-                set_bit(d->irq, irq_affinity_request);
-                err = 0;
-                break;
-        }
-
+        set_bit(d->irq, irq_affinity_request);
         arch_local_irq_restore(flags);
-        return err;
+        return 0;
 }
 #endif /* CONFIG_SMP */
 
diff --git a/arch/mn10300/kernel/mn10300-serial.c b/arch/mn10300/kernel/mn10300-serial.c
index 131b81f9d6c..4968cfe66c0 100644
--- a/arch/mn10300/kernel/mn10300-serial.c
+++ b/arch/mn10300/kernel/mn10300-serial.c
@@ -936,15 +936,18 @@ static int mn10300_serial_startup(struct uart_port *_port)
         irq_set_chip(port->tm_irq, &mn10300_serial_pic);
 
         if (request_irq(port->rx_irq, mn10300_serial_interrupt,
-                        IRQF_DISABLED, port->rx_name, port) < 0)
+                        IRQF_DISABLED | IRQF_NOBALANCING,
+                        port->rx_name, port) < 0)
                 goto error;
 
         if (request_irq(port->tx_irq, mn10300_serial_interrupt,
-                        IRQF_DISABLED, port->tx_name, port) < 0)
+                        IRQF_DISABLED | IRQF_NOBALANCING,
+                        port->tx_name, port) < 0)
                 goto error2;
 
         if (request_irq(port->tm_irq, mn10300_serial_interrupt,
-                        IRQF_DISABLED, port->tm_name, port) < 0)
+                        IRQF_DISABLED | IRQF_NOBALANCING,
+                        port->tm_name, port) < 0)
                 goto error3;
         mn10300_serial_mask_ack(port->tm_irq);
 
diff --git a/arch/mn10300/kernel/smp.c b/arch/mn10300/kernel/smp.c
index e62c223e4c4..95983cd21e7 100644
--- a/arch/mn10300/kernel/smp.c
+++ b/arch/mn10300/kernel/smp.c
@@ -130,10 +130,12 @@ static irqreturn_t smp_call_function_interrupt(int irq, void *dev_id);
 
 static struct irqaction reschedule_ipi = {
         .handler        = smp_reschedule_interrupt,
+        .flags          = IRQF_NOBALANCING,
         .name           = "smp reschedule IPI"
 };
 static struct irqaction call_function_ipi = {
         .handler        = smp_call_function_interrupt,
+        .flags          = IRQF_NOBALANCING,
         .name           = "smp call function IPI"
 };
 
@@ -141,7 +143,7 @@ static struct irqaction call_function_ipi = {
 static irqreturn_t smp_ipi_timer_interrupt(int irq, void *dev_id);
 static struct irqaction local_timer_ipi = {
         .handler        = smp_ipi_timer_interrupt,
-        .flags          = IRQF_DISABLED,
+        .flags          = IRQF_DISABLED | IRQF_NOBALANCING,
         .name           = "smp local timer IPI"
 };
 #endif
@@ -180,6 +182,7 @@ static void init_ipi(void)
 
 #ifdef CONFIG_MN10300_CACHE_ENABLED
         /* set up the cache flush IPI */
+        irq_set_chip(FLUSH_CACHE_IPI, &mn10300_ipi_type);
         flags = arch_local_cli_save();
         __set_intr_stub(NUM2EXCEP_IRQ_LEVEL(FLUSH_CACHE_GxICR_LV),
                         mn10300_low_ipi_handler);
@@ -189,6 +192,7 @@ static void init_ipi(void)
 #endif
 
         /* set up the NMI call function IPI */
+        irq_set_chip(CALL_FUNCTION_NMI_IPI, &mn10300_ipi_type);
         flags = arch_local_cli_save();
         GxICR(CALL_FUNCTION_NMI_IPI) = GxICR_NMI | GxICR_ENABLE | GxICR_DETECT;
         tmp16 = GxICR(CALL_FUNCTION_NMI_IPI);
@@ -199,6 +203,10 @@ static void init_ipi(void)
         __set_intr_stub(NUM2EXCEP_IRQ_LEVEL(SMP_BOOT_GxICR_LV),
                         mn10300_low_ipi_handler);
         arch_local_irq_restore(flags);
+
+#ifdef CONFIG_KERNEL_DEBUGGER
+        irq_set_chip(DEBUGGER_NMI_IPI, &mn10300_ipi_type);
+#endif
 }
 
 /**