[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, 7 insertions, 2 deletions

diff --git a/arch/ia64/mm/discontig.c b/arch/ia64/mm/discontig.c
index c87d6d1d581..573d5cc63e2 100644
--- a/arch/ia64/mm/discontig.c
+++ b/arch/ia64/mm/discontig.c
@@ -528,12 +528,17 @@ void __init find_memory(void)
 void *per_cpu_init(void)
 {
 	int cpu;
+	static int first_time = 1;
+
 
 	if (smp_processor_id() != 0)
 		return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
 
-	for (cpu = 0; cpu < NR_CPUS; cpu++)
-		per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
+	if (first_time) {
+		first_time = 0;
+		for (cpu = 0; cpu < NR_CPUS; cpu++)
+			per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
+	}
 
 	return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
 }