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authorAndi Kleen <ak@suse.de>2005-09-12 18:49:24 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-12 10:49:55 -0700
commit70556463487f33bc6728a7596b97f86b811aad22 (patch)
treece49b46bd6cd2089c82b5a1cea698bf5c6cfd1cc
parent5a40b7c2abdedcf53c9a6ee790991acfcef5b6c7 (diff)
[PATCH] x86-64: Use largest APIC number, not number of CPUs to decide on physflat mode
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>
-rw-r--r--arch/x86_64/kernel/genapic.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/x86_64/kernel/genapic.c b/arch/x86_64/kernel/genapic.c
index b1c144f7314..f3159a496e3 100644
--- a/arch/x86_64/kernel/genapic.c
+++ b/arch/x86_64/kernel/genapic.c
@@ -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;