AcoSail/kernel_optimize_test
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[PATCH] x86-64: Use physflat on Intel for < 8 CPUs with CPU hotplug

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This avoids races with the APIC broadcast/mask modes.

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 27183ebd33
commit 5bf97e0119
1 changed files with 7 additions and 2 deletions
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arch/x86_64/kernel/genapic.c
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@ -104,9 +104,14 @@ void __init clustered_apic_check(void)
* (We don't use lowest priority delivery + HW APIC IRQ steering, so
* can ignore the clustered logical case and go straight to physical.)
*/
if (clusters <= 1 && max_cluster <= 8 && cluster_cnt[0] == max_cluster)
if (clusters <= 1 && max_cluster <= 8 && cluster_cnt[0] == max_cluster) {
#ifdef CONFIG_HOTPLUG_CPU
/* Don't use APIC shortcuts in CPU hotplug to avoid races */
genapic = &apic_physflat;
#else
genapic = &apic_flat;
else
#endif
} else
genapic = &apic_cluster;
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