AcoSail/kernel_optimize_test
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[PATCH] x86-64: Use largest APIC number, not number of CPUs to decide on physflat mode

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Handles case where BIOS gives CPUs very large APIC numbers correctly.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2005-09-12 18:49:24 +02:00 committed by Linus Torvalds
parent 5a40b7c2ab
commit 7055646348
1 changed files with 4 additions and 3 deletions
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arch/x86_64/kernel/genapic.c
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@ -45,7 +45,7 @@ void __init clustered_apic_check(void)
u8 clusters, max_cluster; u8 clusters, max_cluster;
u8 id; u8 id;
u8 cluster_cnt[NUM_APIC_CLUSTERS]; u8 cluster_cnt[NUM_APIC_CLUSTERS];
int num_cpus = 0; int max_apic = 0;
#if defined(CONFIG_ACPI) #if defined(CONFIG_ACPI)
/* /*
@ -64,7 +64,8 @@ void __init clustered_apic_check(void)
id = bios_cpu_apicid[i]; id = bios_cpu_apicid[i];
if (id == BAD_APICID) if (id == BAD_APICID)
continue; continue;
num_cpus++; if (id > max_apic)
max_apic = id;
cluster_cnt[APIC_CLUSTERID(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 have ACPI platform support for CPU hotplug
we should detect hotplug capablity from ACPI tables and we should detect hotplug capablity from ACPI tables and
only do this when really needed. -AK */ only do this when really needed. -AK */
if (num_cpus <= 8) if (max_apic <= 8)
genapic = &apic_flat; genapic = &apic_flat;
#endif #endif
goto print; goto print;