powerpc: partly merge iseries do_IRQ

Hide some of the iseries details in iSeries_get_irq.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

arch/powerpc/kernel/irq.c

@@ -78,10 +78,6 @@ EXPORT_SYMBOL(__irq_offset_value);
 
 static int ppc_spurious_interrupts;
 
-#if defined(CONFIG_PPC_ISERIES) && defined(CONFIG_SMP)
-extern void iSeries_smp_message_recv(struct pt_regs *);
-#endif
-
 #ifdef CONFIG_PPC32
 #define NR_MASK_WORDS	((NR_IRQS + 31) / 32)
 
@@ -195,49 +191,6 @@ void fixup_irqs(cpumask_t map)
 }
 #endif
 
-#ifdef CONFIG_PPC_ISERIES
-void do_IRQ(struct pt_regs *regs)
-{
-	struct paca_struct *lpaca;
-
-	irq_enter();
-
-#ifdef CONFIG_DEBUG_STACKOVERFLOW
-	/* Debugging check for stack overflow: is there less than 2KB free? */
-	{
-		long sp;
-
-		sp = __get_SP() & (THREAD_SIZE-1);
-
-		if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
-			printk("do_IRQ: stack overflow: %ld\n",
-				sp - sizeof(struct thread_info));
-			dump_stack();
-		}
-	}
-#endif
-
-	lpaca = get_paca();
-#ifdef CONFIG_SMP
-	if (lpaca->lppaca.int_dword.fields.ipi_cnt) {
-		lpaca->lppaca.int_dword.fields.ipi_cnt = 0;
-		iSeries_smp_message_recv(regs);
-	}
-#endif /* CONFIG_SMP */
-	if (hvlpevent_is_pending())
-		process_hvlpevents(regs);
-
-	irq_exit();
-
-	if (lpaca->lppaca.int_dword.fields.decr_int) {
-		lpaca->lppaca.int_dword.fields.decr_int = 0;
-		/* Signal a fake decrementer interrupt */
-		timer_interrupt(regs);
-	}
-}
-
-#else	/* CONFIG_PPC_ISERIES */
-
 void do_IRQ(struct pt_regs *regs)
 {
 	int irq;
@@ -286,16 +239,24 @@ void do_IRQ(struct pt_regs *regs)
 		} else
 #endif
 			__do_IRQ(irq, regs);
-	} else
-#ifdef CONFIG_PPC32
-		if (irq != -2)
-#endif
+	} else if (irq != -2)
 		/* That's not SMP safe ... but who cares ? */
 		ppc_spurious_interrupts++;
+
         irq_exit();
-}
 
-#endif	/* CONFIG_PPC_ISERIES */
+#ifdef CONFIG_PPC_ISERIES
+	{
+		struct paca_struct *lpaca = get_paca();
+
+		if (lpaca->lppaca.int_dword.fields.decr_int) {
+			lpaca->lppaca.int_dword.fields.decr_int = 0;
+			/* Signal a fake decrementer interrupt */
+			timer_interrupt(regs);
+		}
+	}
+#endif
+}
 
 void __init init_IRQ(void)
 {

arch/powerpc/platforms/iseries/irq.c

@@ -35,13 +35,19 @@
 #include <linux/irq.h>
 #include <linux/spinlock.h>
 
+#include <asm/paca.h>
 #include <asm/iseries/hv_types.h>
 #include <asm/iseries/hv_lp_event.h>
 #include <asm/iseries/hv_call_xm.h>
+#include <asm/iseries/it_lp_queue.h>
 
 #include "irq.h"
 #include "call_pci.h"
 
+#if defined(CONFIG_SMP)
+extern void iSeries_smp_message_recv(struct pt_regs *);
+#endif
+
 enum pci_event_type {
 	pe_bus_created		= 0,	/* PHB has been created */
 	pe_bus_error		= 1,	/* PHB has failed */
@@ -329,3 +335,24 @@ int __init iSeries_allocate_IRQ(HvBusNumber bus,
 	irq_desc[virtirq].handler = &iSeries_IRQ_handler;
 	return virtirq;
 }
+
+/*
+ * Get the next pending IRQ.
+ */
+int iSeries_get_irq(struct pt_regs *regs)
+{
+	struct paca_struct *lpaca;
+
+	lpaca = get_paca();
+#ifdef CONFIG_SMP
+	if (lpaca->lppaca.int_dword.fields.ipi_cnt) {
+		lpaca->lppaca.int_dword.fields.ipi_cnt = 0;
+		iSeries_smp_message_recv(regs);
+	}
+#endif /* CONFIG_SMP */
+	if (hvlpevent_is_pending())
+		process_hvlpevents(regs);
+
+	/* -2 means ignore this interrupt */
+	return -2;
+}

arch/powerpc/platforms/iseries/irq.h

@@ -4,5 +4,6 @@
 extern void iSeries_init_IRQ(void);
 extern int  iSeries_allocate_IRQ(HvBusNumber, HvSubBusNumber, HvAgentId);
 extern void iSeries_activate_IRQs(void);
+extern int iSeries_get_irq(struct pt_regs *);
 
 #endif /* _ISERIES_IRQ_H */

arch/powerpc/platforms/iseries/setup.c

@@ -569,16 +569,6 @@ static void iSeries_show_cpuinfo(struct seq_file *m)
 	seq_printf(m, "machine\t\t: 64-bit iSeries Logical Partition\n");
 }
 
-/*
- * Document me.
- * and Implement me.
- */
-static int iSeries_get_irq(struct pt_regs *regs)
-{
-	/* -2 means ignore this interrupt */
-	return -2;
-}
-
 /*
  * Document me.
  */