[PATCH] MSI broke voyager build

[PATCH] MSI broke voyager build

[James Bottomley]

The author made the arch/i386 compile depend on NR_VECTORS being
defined.

This symbol, however, was put only into mach-default/irq_vectors.h

The attached patch adds it to voyager; visws and pc9800 however, are
still broken.

The code that breaks is this (in arch/i386/kernel/i8259.c):

 	 * us. (some of these will be overridden and become
 	 * 'special' SMP interrupts)
 	 */
-	for (i = 0; i < NR_IRQS; i++) {
+	for (i = 0; i < (NR_VECTORS - FIRST_EXTERNAL_VECTOR); i++) {
 		int vector = FIRST_EXTERNAL_VECTOR + i;
+		if (i >= NR_IRQS)
+			break;
 		if (vector != SYSCALL_VECTOR) 
 			set_intr_gate(vector, interrupt[i]);

as far as I can see, with NR_VECTORS set at 256, FIRST_EXTERNAL_VECTOR
at 32 and NR_IRQS set at 224 the two forms of the loop are identical. 
The only case it would make a difference would be for NR_IRQ >
NR_VECTORS + FIRST_EXTERNAL_VECTOR which doesn't seem to make any
sense.  Perhaps just backing this change out of i8259.c would be
better?  NR_VECTORS seems to have no other defined use in the MSI code.

James


===== include/asm-i386/mach-voyager/irq_vectors.h 1.4 vs edited =====
--- 1.4/include/asm-i386/mach-voyager/irq_vectors.h	Wed Oct 22 11:34:51 2003
+++ edited/include/asm-i386/mach-voyager/irq_vectors.h	Wed Dec 31 16:30:15 2003
@@ -55,6 +55,7 @@
 #define VIC_CPU_BOOT_CPI		VIC_CPI_LEVEL0
 #define VIC_CPU_BOOT_ERRATA_CPI		(VIC_CPI_LEVEL0 + 8)
 
+#define NR_VECTORS 256
 #define NR_IRQS 224
 #define NR_IRQ_VECTORS NR_IRQS