Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b6278470b7cdbf2bf6ba7345130d83924451a51a
Commit:     b6278470b7cdbf2bf6ba7345130d83924451a51a
Parent:     71fff5e6ca1b738ac4742580e4c0ff79d906f6c8
Author:     Mike Travis <[EMAIL PROTECTED]>
AuthorDate: Fri Oct 19 20:35:03 2007 +0200
Committer:  Thomas Gleixner <[EMAIL PROTECTED]>
CommitDate: Fri Oct 19 20:35:03 2007 +0200

    x86: convert cpu_llc_id to be a per cpu variable
    
    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 additional 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 <[EMAIL PROTECTED]>
    Cc: Andi Kleen <[EMAIL PROTECTED]>
    Cc: Christoph Lameter <[EMAIL PROTECTED]>
    Cc: "Siddha, Suresh B" <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
    Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
---
 arch/x86/kernel/cpu/intel_cacheinfo.c |    4 ++--
 arch/x86/kernel/smpboot_32.c          |    6 +++---
 arch/x86/kernel/smpboot_64.c          |    6 +++---
 include/asm-x86/processor_32.h        |    6 +++++-
 include/asm-x86/smp_64.h              |    3 ++-
 5 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c 
b/arch/x86/kernel/cpu/intel_cacheinfo.c
index 297a241..35c7ebb 100644
--- a/arch/x86/kernel/cpu/intel_cacheinfo.c
+++ b/arch/x86/kernel/cpu/intel_cacheinfo.c
@@ -417,14 +417,14 @@ unsigned int __cpuinit init_intel_cacheinfo(struct 
cpuinfo_x86 *c)
        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
        }
 
diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c
index 631be36..47bccfc 100644
--- a/arch/x86/kernel/smpboot_32.c
+++ b/arch/x86/kernel/smpboot_32.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(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 @@ void __cpuinit set_cpu_sibling_map(int cpu)
        }
 
        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);
                }
diff --git a/arch/x86/kernel/smpboot_64.c b/arch/x86/kernel/smpboot_64.c
index c3e8668..7c8f586 100644
--- a/arch/x86/kernel/smpboot_64.c
+++ b/arch/x86/kernel/smpboot_64.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(u8, cpu_llc_id) = BAD_APICID;
 
 /* Bitmask of currently online CPUs */
 cpumask_t cpu_online_map __read_mostly;
@@ -283,8 +283,8 @@ static inline void set_cpu_sibling_map(int cpu)
        }
 
        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);
                }
diff --git a/include/asm-x86/processor_32.h b/include/asm-x86/processor_32.h
index 83800e7..565b6fc 100644
--- a/include/asm-x86/processor_32.h
+++ b/include/asm-x86/processor_32.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(u8, cpu_llc_id);
 extern char ignore_fpu_irq;
 
 void __init cpu_detect(struct cpuinfo_x86 *c);
diff --git a/include/asm-x86/smp_64.h b/include/asm-x86/smp_64.h
index f154570..6f0e027 100644
--- a/include/asm-x86/smp_64.h
+++ b/include/asm-x86/smp_64.h
@@ -49,7 +49,7 @@ extern int smp_call_function_mask(cpumask_t mask, void 
(*func)(void *),
  */
 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
 
@@ -121,6 +121,7 @@ static __inline int logical_smp_processor_id(void)
 #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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