[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>

2 files changed, 10 insertions, 3 deletions

diff --git a/arch/ia64/mm/contig.c b/arch/ia64/mm/contig.c
index acaaec4e4681..9855ba318094 100644
--- a/arch/ia64/mm/contig.c
+++ b/arch/ia64/mm/contig.c
@@ -181,13 +181,15 @@ per_cpu_init (void)
 {
         void *cpu_data;
         int cpu;
+        static int first_time=1;
 
         /*
          * get_free_pages() cannot be used before cpu_init() done.  BSP
          * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls
          * get_zeroed_page().
          */
-        if (smp_processor_id() == 0) {
+        if (first_time) {
+                first_time=0;
                 cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS,
                                            PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
                 for (cpu = 0; cpu < NR_CPUS; cpu++) {
diff --git a/arch/ia64/mm/discontig.c b/arch/ia64/mm/discontig.c
index c87d6d1d5813..573d5cc63e2b 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()];
 }