x86: cleanup x86_cpu_to_apicid references

Clean up references to x86_cpu_to_apicid.  Removes extraneous
comments and standardizes on "x86_*_early_ptr" for the early
kernel init references.

Signed-off-by: Mike Travis <travis@sgi.com>
Reviewed-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

5 files changed, 17 insertions, 32 deletions

diff --git a/arch/x86/kernel/genapic_64.c b/arch/x86/kernel/genapic_64.c
index ac2b78f24074..4ae7b6440260 100644
--- a/arch/x86/kernel/genapic_64.c
+++ b/arch/x86/kernel/genapic_64.c
@@ -24,17 +24,10 @@
 #include <acpi/acpi_bus.h>
 #endif
 
-/*
- * which logical CPU number maps to which CPU (physical APIC ID)
- *
- * The following static array is used during kernel startup
- * and the x86_cpu_to_apicid_ptr contains the address of the
- * array during this time.  Is it zeroed when the per_cpu
- * data area is removed.
- */
+/* which logical CPU number maps to which CPU (physical APIC ID) */
 u16 x86_cpu_to_apicid_init[NR_CPUS] __initdata
                                         = { [0 ... NR_CPUS-1] = BAD_APICID };
-void *x86_cpu_to_apicid_ptr;
+void *x86_cpu_to_apicid_early_ptr;
 DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID;
 EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid);
 
diff --git a/arch/x86/kernel/mpparse_64.c b/arch/x86/kernel/mpparse_64.c
index 17d21e5b22d6..528ad9696d96 100644
--- a/arch/x86/kernel/mpparse_64.c
+++ b/arch/x86/kernel/mpparse_64.c
@@ -125,14 +125,9 @@ static void __cpuinit MP_processor_info(struct mpc_config_processor *m)
                 cpu = 0;
         }
         bios_cpu_apicid[cpu] = m->mpc_apicid;
-        /*
-         * We get called early in the the start_kernel initialization
-         * process when the per_cpu data area is not yet setup, so we
-         * use a static array that is removed after the per_cpu data
-         * area is created.
-         */
-        if (x86_cpu_to_apicid_ptr) {
-                u16 *x86_cpu_to_apicid = (u16 *)x86_cpu_to_apicid_ptr;
+        /* are we being called early in kernel startup? */
+        if (x86_cpu_to_apicid_early_ptr) {
+                u16 *x86_cpu_to_apicid = (u16 *)x86_cpu_to_apicid_early_ptr;
                 x86_cpu_to_apicid[cpu] = m->mpc_apicid;
         } else {
                 per_cpu(x86_cpu_to_apicid, cpu) = m->mpc_apicid;
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index 12bad27d66f8..e2beb4cba15f 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -360,7 +360,7 @@ void __init setup_arch(char **cmdline_p)
 
 #ifdef CONFIG_SMP
         /* setup to use the static apicid table during kernel startup */
-        x86_cpu_to_apicid_ptr = (void *)&x86_cpu_to_apicid_init;
+        x86_cpu_to_apicid_early_ptr = (void *)&x86_cpu_to_apicid_init;
 #endif
 
 #ifdef CONFIG_ACPI
diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c
index 2034332ad080..915ec6267326 100644
--- a/arch/x86/kernel/smpboot_32.c
+++ b/arch/x86/kernel/smpboot_32.c
@@ -91,15 +91,10 @@ static cpumask_t smp_commenced_mask;
 DEFINE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info);
 EXPORT_PER_CPU_SYMBOL(cpu_info);
 
-/*
- * The following static array is used during kernel startup
- * and the x86_cpu_to_apicid_ptr contains the address of the
- * array during this time.  Is it zeroed when the per_cpu
- * data area is removed.
- */
+/* which logical CPU number maps to which CPU (physical APIC ID) */
 u8 x86_cpu_to_apicid_init[NR_CPUS] __initdata =
                         { [0 ... NR_CPUS-1] = BAD_APICID };
-void *x86_cpu_to_apicid_ptr;
+void *x86_cpu_to_apicid_early_ptr;
 DEFINE_PER_CPU(u8, x86_cpu_to_apicid) = BAD_APICID;
 EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid);
 
diff --git a/arch/x86/kernel/smpboot_64.c b/arch/x86/kernel/smpboot_64.c
index 50e207a8261f..a2076b5f12af 100644
--- a/arch/x86/kernel/smpboot_64.c
+++ b/arch/x86/kernel/smpboot_64.c
@@ -852,23 +852,25 @@ static int __init smp_sanity_check(unsigned max_cpus)
 }
 
 /*
- * Copy apicid's found by MP_processor_info from initial array to the per cpu
- * data area.  The x86_cpu_to_apicid_init array is then expendable and the
- * x86_cpu_to_apicid_ptr is zeroed indicating that the static array is no
- * longer available.
+ * Copy data used in early init routines from the initial arrays to the
+ * per cpu data areas.  These arrays then become expendable and the
+ * *_ptrs are zeroed indicating that the static arrays are gone.
  */
 void __init smp_set_apicids(void)
 {
         int cpu;
 
-        for_each_cpu_mask(cpu, cpu_possible_map) {
+        for_each_possible_cpu(cpu) {
                 if (per_cpu_offset(cpu))
                         per_cpu(x86_cpu_to_apicid, cpu) =
                                                 x86_cpu_to_apicid_init[cpu];
+                else
+                        printk(KERN_NOTICE "per_cpu_offset zero for cpu %d\n",
+                                                                        cpu);
         }
 
-        /* indicate the static array will be going away soon */
-        x86_cpu_to_apicid_ptr = NULL;
+        /* indicate the early static arrays are gone */
+        x86_cpu_to_apicid_early_ptr = NULL;
 }
 
 static void __init smp_cpu_index_default(void)