Clear pending interrupts at CPU boot up time

The pending interrupts can be remaining at boot up time on some platform. This will cause spurious interrupts when interrupt is enabled for the first time. This patch clears IVR at the CPU initialization to eliminate such spurious interrupts.

---
 arch/ia64/kernel/setup.c |    5 +++++
 1 files changed, 5 insertions(+)

Index: linux-2.6.23-rc3/arch/ia64/kernel/setup.c =================================--- linux-2.6.23-rc3.orig/arch/ia64/kernel/setup.c +++ linux-2.6.23-rc3/arch/ia64/kernel/setup.c
@@ -953,6 +953,11 @@ cpu_init (void)

/* clear TPR & XTP to enable all interrupt classes: */ ia64_setreg(_IA64_REG_CR_TPR, 0);
+
+ /* Clear any pending interrupts left by SAL/EFI */
+ while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR)
+ ia64_eoi();
+
#ifdef CONFIG_SMP
normal_xtp();
#endif