From 70556463487f33bc6728a7596b97f86b811aad22 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Mon, 12 Sep 2005 18:49:24 +0200 Subject: [PATCH] [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 Signed-off-by: Linus Torvalds --- arch/x86_64/kernel/genapic.c | 7 ++++--- 1 file 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; -- 2.41.1