[PATCH 4/6] x86: Convert cpu_llc_id to be a per cpu variable

[travis@sgi.com]

Convert cpu_llc_id from a static array sized by NR_CPUS to a
per_cpu variable.  This saves sizeof(cpu_llc_id) * NR unused
cpus.  Access is mostly from startup and CPU HOTPLUG functions.

Note the addtional change of the cpu_llc_id type from u8
to int for ARCH x86_64 to correspond with ARCH i386.

Signed-off-by: Mike Travis <travis@sgi.com>
---
 arch/i386/kernel/cpu/intel_cacheinfo.c |    4 ++--
 arch/i386/kernel/smpboot.c             |    6 +++---
 arch/x86_64/kernel/smpboot.c           |    6 +++---
 include/asm-i386/processor.h           |    6 +++++-
 include/asm-x86_64/smp.h               |    8 +++-----
 5 files changed, 16 insertions(+), 14 deletions(-)

--- a/arch/i386/kernel/cpu/intel_cacheinfo.c
+++ b/arch/i386/kernel/cpu/intel_cacheinfo.c
@@ -417,14 +417,14 @@ unsigned int __cpuinit init_intel_cachei
 	if (new_l2) {
 		l2 = new_l2;
 #ifdef CONFIG_X86_HT
-		cpu_llc_id[cpu] = l2_id;
+		per_cpu(cpu_llc_id, cpu) = l2_id;
 #endif
 	}
 
 	if (new_l3) {
 		l3 = new_l3;
 #ifdef CONFIG_X86_HT
-		cpu_llc_id[cpu] = l3_id;
+		per_cpu(cpu_llc_id, cpu) = l3_id;
 #endif
 	}
 
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -67,7 +67,7 @@ int smp_num_siblings = 1;
 EXPORT_SYMBOL(smp_num_siblings);
 
 /* Last level cache ID of each logical CPU */
-int cpu_llc_id[NR_CPUS] __cpuinitdata = {[0 ... NR_CPUS-1] = BAD_APICID};
+DEFINE_PER_CPU(int, cpu_llc_id) = BAD_APICID;
 
 /* representing HT siblings of each logical CPU */
 DEFINE_PER_CPU(cpumask_t, cpu_sibling_map);
@@ -348,8 +348,8 @@ void __cpuinit set_cpu_sibling_map(int c
 	}
 
 	for_each_cpu_mask(i, cpu_sibling_setup_map) {
-		if (cpu_llc_id[cpu] != BAD_APICID &&
-		    cpu_llc_id[cpu] == cpu_llc_id[i]) {
+		if (per_cpu(cpu_llc_id, cpu) != BAD_APICID &&
+		    per_cpu(cpu_llc_id, cpu) == per_cpu(cpu_llc_id, i)) {
 			cpu_set(i, c[cpu].llc_shared_map);
 			cpu_set(cpu, c[i].llc_shared_map);
 		}
--- a/arch/x86_64/kernel/smpboot.c
+++ b/arch/x86_64/kernel/smpboot.c
@@ -65,7 +65,7 @@ int smp_num_siblings = 1;
 EXPORT_SYMBOL(smp_num_siblings);
 
 /* Last level cache ID of each logical CPU */
-u8 cpu_llc_id[NR_CPUS] __cpuinitdata  = {[0 ... NR_CPUS-1] = BAD_APICID};
+DEFINE_PER_CPU(int, cpu_llc_id) = BAD_APICID;
 
 /* Bitmask of currently online CPUs */
 cpumask_t cpu_online_map __read_mostly;
@@ -285,8 +285,8 @@ static inline void set_cpu_sibling_map(i
 	}
 
 	for_each_cpu_mask(i, cpu_sibling_setup_map) {
-		if (cpu_llc_id[cpu] != BAD_APICID &&
-		    cpu_llc_id[cpu] == cpu_llc_id[i]) {
+		if (per_cpu(cpu_llc_id, cpu) != BAD_APICID &&
+		    per_cpu(cpu_llc_id, cpu) == per_cpu(cpu_llc_id, i)) {
 			cpu_set(i, c[cpu].llc_shared_map);
 			cpu_set(cpu, c[i].llc_shared_map);
 		}
--- a/include/asm-i386/processor.h
+++ b/include/asm-i386/processor.h
@@ -110,7 +110,11 @@ extern struct cpuinfo_x86 cpu_data[];
 #define current_cpu_data boot_cpu_data
 #endif
 
-extern	int cpu_llc_id[NR_CPUS];
+/*
+ * the following now lives in the per cpu area:
+ * extern	int cpu_llc_id[NR_CPUS];
+ */
+DECLARE_PER_CPU(int, cpu_llc_id);
 extern char ignore_fpu_irq;
 
 void __init cpu_detect(struct cpuinfo_x86 *c);
--- a/include/asm-x86_64/smp.h
+++ b/include/asm-x86_64/smp.h
@@ -39,16 +39,14 @@ extern int smp_num_siblings;
 extern void smp_send_reschedule(int cpu);
 
 /*
- * cpu_sibling_map and cpu_core_map now live
- * in the per cpu area
- *
+ * the following now live in the per cpu area:
  * extern cpumask_t cpu_sibling_map[NR_CPUS];
  * extern cpumask_t cpu_core_map[NR_CPUS];
+ * extern u8 cpu_llc_id[NR_CPUS];
  */
 DECLARE_PER_CPU(cpumask_t, cpu_sibling_map);
 DECLARE_PER_CPU(cpumask_t, cpu_core_map);
-
-extern u8 cpu_llc_id[NR_CPUS];
+DECLARE_PER_CPU(int, cpu_llc_id);
 
 #define SMP_TRAMPOLINE_BASE 0x6000
 

-- 
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