[PATCH 2.4.31-pre1] x86_64 breakage on UP_IOAPIC

[Mikael Pettersson <mikpe@user.it.uu.se>]

The

  o x86_64: Resend lost APIC IRQs on Uniprocessor too

change in 2.4.31-pre1 causes linkage errors: on UP_IOAPIC systems it
creates references to send_IPI_self() which is only defined on SMP.

The patch below reverts this change.

Alternatively, x86_64 could implement a send_IPI_self() fallback for !SMP,
just like i386 does.

/Mikael

--- linux-2.4.31-pre1/include/asm-x86_64/hw_irq.h.~1~	2005-04-26 20:57:43.000000000 +0200
+++ linux-2.4.31-pre1/include/asm-x86_64/hw_irq.h	2005-04-26 21:09:31.000000000 +0200
@@ -156,7 +156,7 @@ static inline void x86_do_profile (unsig
 	atomic_inc((atomic_t *)&prof_buffer[eip]);
 }
 
-#ifdef CONFIG_X86_IO_APIC
+#ifdef CONFIG_SMP /*more of this file should probably be ifdefed SMP */
 static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {
 	if (IO_APIC_IRQ(i))
 		send_IPI_self(IO_APIC_VECTOR(i));
-
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