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Commit 5bf97e01 authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
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[PATCH] x86-64: Use physflat on Intel for < 8 CPUs with CPU hotplug 



This avoids races with the APIC broadcast/mask modes.

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 27183ebd

arch/x86_64/kernel/genapic.c

+7 −2
Original line number Original line Diff line number Diff line
@@ -104,9 +104,14 @@ void __init clustered_apic_check(void) 
	 * (We don't use lowest priority delivery + HW APIC IRQ steering, so

	 * (We don't use lowest priority delivery + HW APIC IRQ steering, so

	 * can ignore the clustered logical case and go straight to physical.)

	 * 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;

		genapic = &apic_flat;

	else

#endif

	} else

		genapic = &apic_cluster;

		genapic = &apic_cluster;





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