26 lines
801 B
Diff
26 lines
801 B
Diff
Change default IO-APIC ack mode for single IO-APIC systems to old-style. Jan
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Index: xen-unstable/xen/arch/x86/io_apic.c
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===================================================================
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--- xen-unstable.orig/xen/arch/x86/io_apic.c
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+++ xen-unstable/xen/arch/x86/io_apic.c
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@@ -1339,7 +1339,7 @@ static unsigned int startup_level_ioapic
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return 0; /* don't check for pending */
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}
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-int ioapic_ack_new = 1;
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+int ioapic_ack_new = -1;
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static void setup_ioapic_ack(char *s)
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{
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if ( !strcmp(s, "old") )
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@@ -1776,6 +1776,8 @@ void __init setup_IO_APIC(void)
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else
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io_apic_irqs = ~PIC_IRQS;
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+ if (ioapic_ack_new < 0)
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+ ioapic_ack_new = (nr_ioapics > 1);
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printk("ENABLING IO-APIC IRQs\n");
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printk(" -> Using %s ACK method\n", ioapic_ack_new ? "new" : "old");
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