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Subject[PATCH 06/10] x86: Convert cpu_llc_id to be a per cpu variable (v3)
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 there's an addtional change of the type of cpu_llc_id
from int to u8 for ARCH i386 to correspond with the same
type in ARCH x86_64.

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 | 9 ++++-----
5 files changed, 17 insertions(+), 14 deletions(-)
--- a/arch/i386/kernel/cpu/intel_cacheinfo.c
+++ b/arch/i386/kernel/cpu/intel_cacheinfo.c
@@ -417,14 +417,14 @@
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 @@
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(u8, cpu_llc_id) = BAD_APICID;

/* representing HT siblings of each logical CPU */
DEFINE_PER_CPU(cpumask_t, cpu_sibling_map);
@@ -348,8 +348,8 @@
}

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 @@
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(u8, cpu_llc_id) = BAD_APICID;

/* Bitmask of currently online CPUs */
cpumask_t cpu_online_map __read_mostly;
@@ -285,8 +285,8 @@
}

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 @@
#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(u8, 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 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(u8, cpu_llc_id);

#define SMP_TRAMPOLINE_BASE 0x6000

@@ -120,6 +118,7 @@
#ifdef CONFIG_SMP
#define cpu_physical_id(cpu) per_cpu(x86_cpu_to_apicid, cpu)
#else
+extern unsigned int boot_cpu_id;
#define cpu_physical_id(cpu) boot_cpu_id
#endif /* !CONFIG_SMP */
#endif
--
-
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