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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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7
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 id;
u8 cluster_cnt[NUM_APIC_CLUSTERS];
int num_cpus = 0;
int max_apic = 0;
#if defined(CONFIG_ACPI)
/*
@ -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;