[PATCH] x86: fix the irqbalance quirk for E7320/E7520/E7525

Move the irqbalance quirks for E7320/E7520/E7525(Errata 23 in
http://download.intel.com/design/chipsets/specupdt/30304203.pdf) to early
quirks.

And add a PCI quirk for these platforms to check(which happens very late
during the boot) if the APIC routing is indeed set to default flat mode.

This fixes the breakage(in x86_64) of this quirk due to cpu hotplug which
selects physical mode instead of the logical flat(as needed for this errata
workaround).

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Cc: "Li, Shaohua" <shaohua.li@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>

3 files changed, 4 insertions, 1 deletions

diff --git a/include/asm-i386/genapic.h b/include/asm-i386/genapic.h
index 8ffbb0f07457..fd2be593b06e 100644
--- a/include/asm-i386/genapic.h
+++ b/include/asm-i386/genapic.h
@@ -122,6 +122,6 @@ struct genapic {
         APICFUNC(phys_pkg_id) \
         }
 
-extern struct genapic *genapic;
+extern struct genapic *genapic, apic_default;
 
 #endif
diff --git a/include/asm-i386/irq.h b/include/asm-i386/irq.h
index 9e15ce0006eb..11761cdaae19 100644
--- a/include/asm-i386/irq.h
+++ b/include/asm-i386/irq.h
@@ -37,6 +37,8 @@ static __inline__ int irq_canonicalize(int irq)
 extern int irqbalance_disable(char *str);
 #endif
 
+extern void quirk_intel_irqbalance(void);
+
 #ifdef CONFIG_HOTPLUG_CPU
 extern void fixup_irqs(cpumask_t map);
 #endif
diff --git a/include/asm-x86_64/proto.h b/include/asm-x86_64/proto.h
index 21fa5afa232e..6d324b838972 100644
--- a/include/asm-x86_64/proto.h
+++ b/include/asm-x86_64/proto.h
@@ -87,6 +87,7 @@ extern void syscall32_cpu_init(void);
 extern void setup_node_bootmem(int nodeid, unsigned long start, unsigned long end);
 
 extern void early_quirks(void);
+extern void quirk_intel_irqbalance(void);
 extern void check_efer(void);
 
 extern int unhandled_signal(struct task_struct *tsk, int sig);