[PATCH] x86-64: Don't trust boot_cpu_id in the mptable.

[pandora-kernel.git] / arch / x86_64 / kernel / genapic.c

diff --git a/arch/x86_64/kernel/genapic.c b/arch/x86_64/kernel/genapic.c
index 30c843a..f3159a4 100644 (file)
--- a/arch/x86_64/kernel/genapic.c
+++ b/arch/x86_64/kernel/genapic.c
@@ -20,12 +20,12 @@
 #include <asm/smp.h>
 #include <asm/ipi.h>
 
-#if defined(CONFIG_ACPI_BUS)
+#if defined(CONFIG_ACPI)
 #include <acpi/acpi_bus.h>
 #endif
 
 /* which logical CPU number maps to which CPU (physical APIC ID) */
-u8 x86_cpu_to_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
+u8 x86_cpu_to_apicid[NR_CPUS] __read_mostly = { [0 ... NR_CPUS-1] = BAD_APICID };
 EXPORT_SYMBOL(x86_cpu_to_apicid);
 u8 x86_cpu_to_log_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
 
@@ -45,9 +45,9 @@ void __init clustered_apic_check(void)
        u8 clusters, max_cluster;
        u8 id;
        u8 cluster_cnt[NUM_APIC_CLUSTERS];
-       int num_cpus = 0;
+       int max_apic = 0;
 
-#if defined(CONFIG_ACPI_BUS)
+#if defined(CONFIG_ACPI)
        /*
         * Some x86_64 machines use physical APIC mode regardless of how many
         * procs/clusters are present (x86_64 ES7000 is an example).
@@ -64,7 +64,8 @@ void __init clustered_apic_check(void)
                id = bios_cpu_apicid[i];
                if (id == BAD_APICID)
                        continue;
-               num_cpus++;
+               if (id > max_apic)
+                       max_apic = id;
                cluster_cnt[APIC_CLUSTERID(id)]++;
        }
 
@@ -79,7 +80,7 @@ void __init clustered_apic_check(void)
                   we have ACPI platform support for CPU hotplug
                   we should detect hotplug capablity from ACPI tables and
                   only do this when really needed. -AK */
-               if (num_cpus <= 8)
+               if (max_apic <= 8)
                        genapic = &apic_flat;
 #endif
                goto print;