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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 10:50:56 -0700
commit5bf97e01192f0fcdff2f0e9eae063e7785f6f915 (patch)
treeef7139d95cfa67c2a80884cb60382342ad5bf79c
parent27183ebd330a676fe29f7eb9b7ff582492246ec8 (diff)
downloadlinux-linaro-5bf97e01192f0fcdff2f0e9eae063e7785f6f915.tar.gz
[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: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/x86_64/kernel/genapic.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/x86_64/kernel/genapic.c b/arch/x86_64/kernel/genapic.c
index fe416fd4dbe..7a64ea18178 100644
--- a/arch/x86_64/kernel/genapic.c
+++ b/arch/x86_64/kernel/genapic.c
@@ -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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