ppc64: remove ppc_md.post_irq, clean up do_IRQ

arch/ppc64/kernel/chrp_setup.c

@@ -238,11 +238,9 @@ chrp_init(unsigned long r3, unsigned long r4, unsigned long r5,
 	if(naca->interrupt_controller == IC_OPEN_PIC) {
 		ppc_md.init_IRQ       = openpic_init_IRQ; 
 		ppc_md.get_irq        = openpic_get_irq;
-		ppc_md.post_irq	      = NULL;
 	} else {
 		ppc_md.init_IRQ       = xics_init_IRQ;
 		ppc_md.get_irq        = xics_get_irq;
-		ppc_md.post_irq	      = NULL;
 	}
 	ppc_md.init_ras_IRQ = init_ras_IRQ;
 

arch/ppc64/kernel/irq.c

@@ -501,58 +501,55 @@ void ppc_irq_dispatch_handler(struct pt_regs *regs, int irq)
 	spin_unlock(&desc->lock);
 }
 
-int do_IRQ(struct pt_regs *regs, int isfake)
+int do_IRQ(struct pt_regs *regs)
 {
 	int cpu = smp_processor_id();
-	int irq;
-	struct Paca * paca;
-	struct ItLpQueue * lpq;
-
-	/* if(cpu) udbg_printf("Entering do_IRQ\n");  */
+	int irq, first = 1;
+#ifdef CONFIG_PPC_ISERIES
+	struct Paca *paca;
+	struct ItLpQueue *lpq;
+#endif
 
-        irq_enter(cpu);
+	irq_enter(cpu);
 
-	if ( _machine != _MACH_iSeries ) {
-	
-		/* every arch is required to have a get_irq -- Cort */
-		irq = ppc_md.get_irq( regs );
-
-		if ( irq >= 0 ) {
-			ppc_irq_dispatch_handler( regs, irq );
-			if (ppc_md.post_irq)
-				ppc_md.post_irq( regs, irq );
-		} else {
-			/* -2 means ignore, already handled */
-			if (irq != -2) {
-				printk(KERN_DEBUG "Bogus interrupt %d from PC = %lx\n",
-					irq, regs->nip);
-				ppc_spurious_interrupts++;
-			}
-		}
-	}
-	/* if on iSeries partition */
-	else {
-		paca = (struct Paca *)mfspr(SPRG3);
+#ifdef CONFIG_PPC_ISERIES
+	paca = get_paca();
 #ifdef CONFIG_SMP
-		if ( paca->xLpPaca.xIntDword.xFields.xIpiCnt ) {
-			paca->xLpPaca.xIntDword.xFields.xIpiCnt = 0;
-			iSeries_smp_message_recv( regs );
-		}
+	if (paca->xLpPaca.xIntDword.xFields.xIpiCnt) {
+		paca->xLpPaca.xIntDword.xFields.xIpiCnt = 0;
+		iSeries_smp_message_recv(regs);
+	}
 #endif /* CONFIG_SMP */
-		lpq = paca->lpQueuePtr;
-		if ( lpq && ItLpQueue_isLpIntPending( lpq ) )
-			lpEvent_count += ItLpQueue_process( lpq, regs );
+	lpq = paca->lpQueuePtr;
+	if (lpq && ItLpQueue_isLpIntPending(lpq))
+		lpEvent_count += ItLpQueue_process(lpq, regs);
+#else
+	/*
+	 * Every arch is required to implement ppc_md.get_irq.
+	 * This function will either return an irq number or -1 to
+	 * indicate there are no more pending.  But the first time
+	 * through the loop this means there wasn't an IRQ pending.
+	 * The value -2 is for buggy hardware and means that this IRQ
+	 * has already been handled. -- Tom
+	 */
+	while ((irq = ppc_md.get_irq(regs)) >= 0) {
+		ppc_irq_dispatch_handler(regs, irq);
+		first = 0;
 	}
-		
+	if (irq != -2 && first)
+		/* That's not SMP safe ... but who cares ? */
+		ppc_spurious_interrupts++;
+#endif
+
         irq_exit(cpu);
 
-	if ( _machine == _MACH_iSeries ) {
-		if ( paca->xLpPaca.xIntDword.xFields.xDecrInt ) {
-			paca->xLpPaca.xIntDword.xFields.xDecrInt = 0;
-			/* Signal a fake decrementer interrupt */
-			timer_interrupt( regs );
-		}
+#ifdef CONFIG_PPC_ISERIES
+	if (paca->xLpPaca.xIntDword.xFields.xDecrInt) {
+		paca->xLpPaca.xIntDword.xFields.xDecrInt = 0;
+		/* Signal a fake decrementer interrupt */
+		timer_interrupt(regs);
 	}
+#endif
 
 	if (softirq_pending(cpu))
 		do_softirq();

arch/ppc64/kernel/open_pic.c

@@ -47,7 +47,6 @@ static int broken_ipi_registers;
 OpenPIC_SourcePtr ISU[OPENPIC_MAX_ISU];
 
 static void openpic_end_irq(unsigned int irq_nr);
-static void openpic_ack_irq(unsigned int irq_nr);
 static void openpic_set_affinity(unsigned int irq_nr, unsigned long cpumask);
 
 struct hw_interrupt_type open_pic = {
@@ -56,14 +55,13 @@ struct hw_interrupt_type open_pic = {
 	NULL,
 	openpic_enable_irq,
 	openpic_disable_irq,
-	openpic_ack_irq,
+	NULL,
 	openpic_end_irq,
 	openpic_set_affinity
 };
 
 #ifdef CONFIG_SMP
 static void openpic_end_ipi(unsigned int irq_nr);
-static void openpic_ack_ipi(unsigned int irq_nr);
 static void openpic_enable_ipi(unsigned int irq_nr);
 static void openpic_disable_ipi(unsigned int irq_nr);
 
@@ -73,9 +71,9 @@ struct hw_interrupt_type open_pic_ipi = {
 	NULL,
 	openpic_enable_ipi,
 	openpic_disable_ipi,
-	openpic_ack_ipi,
+	NULL,
 	openpic_end_ipi,
-	0
+	NULL
 };
 #endif /* CONFIG_SMP */
 
@@ -756,13 +754,6 @@ static inline void openpic_set_sense(u_int irq, int sense)
 				(sense ? OPENPIC_SENSE_LEVEL : 0));
 }
 
-/* No spinlocks, should not be necessary with the OpenPIC
- * (1 register = 1 interrupt and we have the desc lock).
- */
-static void openpic_ack_irq(unsigned int irq_nr)
-{
-}
-
 static void openpic_end_irq(unsigned int irq_nr)
 {
 	if ((irq_desc[irq_nr].status & IRQ_LEVEL) != 0)
@@ -775,10 +766,6 @@ static void openpic_set_affinity(unsigned int irq_nr, unsigned long cpumask)
 }
 
 #ifdef CONFIG_SMP
-static void openpic_ack_ipi(unsigned int irq_nr)
-{
-}
-
 static void openpic_end_ipi(unsigned int irq_nr)
 {
 	/* IPIs are marked IRQ_PER_CPU. This has the side effect of

arch/ppc64/kernel/xics.c

@@ -233,9 +233,9 @@ xics_get_irq(struct pt_regs *regs)
 		}
 	} else if( vec == XICS_IRQ_SPURIOUS ) {
 		irq = -1;
-		printk("spurious PPC interrupt!\n");
-	} else
+	} else {
 		irq = real_irq_to_virt(vec) + XICS_IRQ_OFFSET;
+	}
 	return irq;
 }
 

include/asm-ppc64/machdep.h

@@ -78,7 +78,6 @@ struct machdep_calls {
 	void		(*init_IRQ)(void);
 	void		(*init_ras_IRQ)(void);
 	int		(*get_irq)(struct pt_regs *);
-	void		(*post_irq)( struct pt_regs *, int );
 	
 	/* A general init function, called by ppc_init in init/main.c.
 	   May be NULL. */