[IA64] support for cpu0 removal

here is the BSP removal support for IA64. Its pretty much the same thing that
was released a while back, but has your feedback incorporated.

- Removed CONFIG_BSP_REMOVE_WORKAROUND and associated cmdline param
- Fixed compile issue with sn2/zx1 due to a undefined fix_b0_for_bsp
- some formatting nits (whitespace etc)

This has been tested on tiger and long back by alex on hp systems as well.

Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c
index 574084f343fa..37ac742da8ed 100644
--- a/arch/ia64/kernel/iosapic.c
+++ b/arch/ia64/kernel/iosapic.c
@@ -631,6 +631,7 @@ get_target_cpu (unsigned int gsi, int vector)
 {
 #ifdef CONFIG_SMP
         static int cpu = -1;
+        extern int cpe_vector;
 
         /*
          * In case of vector shared by multiple RTEs, all RTEs that
@@ -653,6 +654,11 @@ get_target_cpu (unsigned int gsi, int vector)
         if (!cpu_online(smp_processor_id()))
                 return cpu_physical_id(smp_processor_id());
 
+#ifdef CONFIG_ACPI
+                if (cpe_vector > 0 && vector == IA64_CPEP_VECTOR)
+                        return get_cpei_target_cpu();
+#endif
+
 #ifdef CONFIG_NUMA
         {
                 int num_cpus, cpu_index, iosapic_index, numa_cpu, i = 0;