[PATCH] i386/x86_64: Remove global IO_APIC_VECTOR

Which vector an irq is assigned to now varies dynamically and is
not needed outside of io_apic.c.  So remove the possibility
of accessing the information outside of io_apic.c and remove
the silly macro that makes looking for users of irq_vector
difficult.

The fact this compiles ensures there aren't any more pieces
of the old CONFIG_PCI_MSI weirdness that I failed to remove.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/kernel/io_apic.c

@@ -1184,8 +1184,8 @@ static int __assign_irq_vector(int irq)
 
 	BUG_ON((unsigned)irq >= NR_IRQ_VECTORS);
 
-	if (IO_APIC_VECTOR(irq) > 0)
-		return IO_APIC_VECTOR(irq);
+	if (irq_vector[irq] > 0)
+		return irq_vector[irq];
 
 	current_vector += 8;
 	if (current_vector == SYSCALL_VECTOR)
@@ -1199,7 +1199,7 @@ static int __assign_irq_vector(int irq)
 	}
 
 	vector = current_vector;
-	IO_APIC_VECTOR(irq) = vector;
+	irq_vector[irq] = vector;
 
 	return vector;
 }
@@ -1967,7 +1967,7 @@ static void ack_ioapic_quirk_irq(unsigned int irq)
  * operation to prevent an edge-triggered interrupt escaping meanwhile.
  * The idea is from Manfred Spraul.  --macro
  */
-	i = IO_APIC_VECTOR(irq);
+	i = irq_vector[irq];
 
 	v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
 
@@ -1984,7 +1984,7 @@ static void ack_ioapic_quirk_irq(unsigned int irq)
 
 static int ioapic_retrigger_irq(unsigned int irq)
 {
-	send_IPI_self(IO_APIC_VECTOR(irq));
+	send_IPI_self(irq_vector[irq]);
 
 	return 1;
 }
@@ -2020,7 +2020,7 @@ static inline void init_IO_APIC_traps(void)
 	 */
 	for (irq = 0; irq < NR_IRQS ; irq++) {
 		int tmp = irq;
-		if (IO_APIC_IRQ(tmp) && !IO_APIC_VECTOR(tmp)) {
+		if (IO_APIC_IRQ(tmp) && !irq_vector[tmp]) {
 			/*
 			 * Hmm.. We don't have an entry for this,
 			 * so default to an old-fashioned 8259

arch/x86_64/kernel/io_apic.c

@@ -587,8 +587,8 @@ static int __assign_irq_vector(int irq, cpumask_t mask)
 
 	BUG_ON((unsigned)irq >= NR_IRQ_VECTORS);
 
-	if (IO_APIC_VECTOR(irq) > 0)
-		old_vector = IO_APIC_VECTOR(irq);
+	if (irq_vector[irq] > 0)
+		old_vector = irq_vector[irq];
 	if ((old_vector > 0) && cpu_isset(old_vector >> 8, mask)) {
 		return old_vector;
 	}
@@ -620,7 +620,7 @@ next:
 		}
 		per_cpu(vector_irq, cpu)[vector] = irq;
 		vector |= cpu << 8;
-		IO_APIC_VECTOR(irq) = vector;
+		irq_vector[irq] = vector;
 		return vector;
 	}
 	return -ENOSPC;
@@ -1289,7 +1289,7 @@ static inline void init_IO_APIC_traps(void)
 	 */
 	for (irq = 0; irq < NR_IRQS ; irq++) {
 		int tmp = irq;
-		if (IO_APIC_IRQ(tmp) && !IO_APIC_VECTOR(tmp)) {
+		if (IO_APIC_IRQ(tmp) && !irq_vector[tmp]) {
 			/*
 			 * Hmm.. We don't have an entry for this,
 			 * so default to an old-fashioned 8259

include/asm-i386/hw_irq.h

@@ -26,9 +26,6 @@
  * Interrupt entry/exit code at both C and assembly level
  */
 
-extern u8 irq_vector[NR_IRQ_VECTORS];
-#define IO_APIC_VECTOR(irq)	(irq_vector[irq])
-
 extern void (*interrupt[NR_IRQS])(void);
 
 #ifdef CONFIG_SMP

include/asm-x86_64/hw_irq.h

@@ -74,10 +74,8 @@
 
 
 #ifndef __ASSEMBLY__
-extern unsigned int irq_vector[NR_IRQ_VECTORS];
 typedef int vector_irq_t[NR_VECTORS];
 DECLARE_PER_CPU(vector_irq_t, vector_irq);
-#define IO_APIC_VECTOR(irq)	(irq_vector[irq])
 
 /*
  * Various low-level irq details needed by irq.c, process.c,