[PATCH] Fix NR_IRQS when no IO apic

Brian Gerst (bgerst@didntduck.org)
Sun, 27 Jan 2002 19:27:24 -0500

This is a multi-part message in MIME format.
--------------8702CE4CB7F0BCA41CBB3B10
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

NR_IRQS should be 16 when the IO apic is not configured, as the 8259 PIC
cannot generate any more interrupts. It also fixes a bug where the IDT
gets populated with random addresses, since only 16 entry stubs are
created.

-- 


						Brian Gerst
--------------8702CE4CB7F0BCA41CBB3B10
Content-Type: text/plain; charset=us-ascii;
 name="nrirqs-1"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
 filename="nrirqs-1"


diff -urN linux-2.5.3-pre5/include/asm-i386/irq.h linux/include/asm-i386/irq.h
--- linux-2.5.3-pre5/include/asm-i386/irq.h	Fri Jan 25 02:25:47 2002
+++ linux/include/asm-i386/irq.h	Fri Jan 25 11:30:44 2002
@@ -23,7 +23,11 @@
  * Since vectors 0x00-0x1f are used/reserved for the CPU,
  * the usable vector space is 0x20-0xff (224 vectors)
  */
+#ifdef CONFIG_X86_IO_APIC
 #define NR_IRQS 224
+#else
+#define NR_IRQS 16
+#endif
 
 static __inline__ int irq_cannonicalize(int irq)
 {




--------------8702CE4CB7F0BCA41CBB3B10--


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/