x86: I/O APIC: clean up the 8259A on a NMI watchdog failure
There is no point in keeping the 8259A enabled if the I/O APIC NMI
watchdog has failed and the 8259A is not used to pass through regular
timer interrupts. This fixes problems with some systems where some logic
gets confused.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/asm-x86/io_apic.h b/include/asm-x86/io_apic.h
index d593e14..a673256 100644
--- a/include/asm-x86/io_apic.h
+++ b/include/asm-x86/io_apic.h
@@ -137,6 +137,9 @@
/* 1 if "noapic" boot option passed */
extern int skip_ioapic_setup;
+/* 1 if the timer IRQ uses the '8259A Virtual Wire' mode */
+extern int timer_through_8259;
+
static inline void disable_ioapic_setup(void)
{
skip_ioapic_setup = 1;
@@ -162,6 +165,7 @@
#else /* !CONFIG_X86_IO_APIC */
#define io_apic_assign_pci_irqs 0
+static const int timer_through_8259 = 0;
#endif
#endif
