x86: Convert cpu_core_map to be a per cpu variable

This is from an earlier message from 'Christoph Lameter':

    cpu_core_map is currently an array defined using NR_CPUS. This means that
    we overallocate since we will rarely really use maximum configured cpu.

    If we put the cpu_core_map into the per cpu area then it will be allocated
    for each processor as it comes online.

    This means that the core map cannot be accessed until the per cpu area
    has been allocated. Xen does a weird thing here looping over all processors
    and zeroing the masks that are not yet allocated and that will be zeroed
    when they are allocated. I commented the code out.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Mike Travis <travis@sgi.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/arch/x86/kernel/mce_amd_64.c b/arch/x86/kernel/mce_amd_64.c
index 2f8a7f18b0fe..805b62b1e0df 100644
--- a/arch/x86/kernel/mce_amd_64.c
+++ b/arch/x86/kernel/mce_amd_64.c
@@ -472,7 +472,7 @@ static __cpuinit int threshold_create_bank(unsigned int cpu, unsigned int bank)
 
 #ifdef CONFIG_SMP
         if (cpu_data[cpu].cpu_core_id && shared_bank[bank]) {   /* symlink */
-                i = first_cpu(cpu_core_map[cpu]);
+                i = first_cpu(per_cpu(cpu_core_map, cpu));
 
                 /* first core not up yet */
                 if (cpu_data[i].cpu_core_id)
@@ -492,7 +492,7 @@ static __cpuinit int threshold_create_bank(unsigned int cpu, unsigned int bank)
                 if (err)
                         goto out;
 
-                b->cpus = cpu_core_map[cpu];
+                b->cpus = per_cpu(cpu_core_map, cpu);
                 per_cpu(threshold_banks, cpu)[bank] = b;
                 goto out;
         }
@@ -509,7 +509,7 @@ static __cpuinit int threshold_create_bank(unsigned int cpu, unsigned int bank)
 #ifndef CONFIG_SMP
         b->cpus = CPU_MASK_ALL;
 #else
-        b->cpus = cpu_core_map[cpu];
+        b->cpus = per_cpu(cpu_core_map, cpu);
 #endif
         err = kobject_register(&b->kobj);
         if (err)