[PATCH] genirq: x86_64 irq: make vector_irq per cpu

This refactors the irq handling code to make the vectors a per cpu resource so
the same vector number can be simultaneously used on multiple cpus for
different irqs.

This should make systems that were hitting limits on the total number of irqs
much more livable.

[akpm@osdl.org: build fix]
[akpm@osdl.org: __target_IO_APIC_irq is unneeded on UP]
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Rajesh Shah <rajesh.shah@intel.com>
Cc: Andi Kleen <ak@muc.de>
Cc: "Protasevich, Natalie" <Natalie.Protasevich@UNISYS.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/include/asm-x86_64/hw_irq.h b/include/asm-x86_64/hw_irq.h
index 9f6a0bfed727..53d0d9fd10d6 100644
--- a/include/asm-x86_64/hw_irq.h
+++ b/include/asm-x86_64/hw_irq.h
@@ -19,6 +19,7 @@
 #include <asm/irq.h>
 #include <linux/profile.h>
 #include <linux/smp.h>
+#include <linux/percpu.h>
 #endif
 
 #define NMI_VECTOR              0x02
@@ -73,8 +74,9 @@
 
 
 #ifndef __ASSEMBLY__
-extern u8 irq_vector[NR_IRQ_VECTORS];
-extern int vector_irq[NR_VECTORS];
+extern unsigned int irq_vector[NR_IRQ_VECTORS];
+typedef int vector_irq_t[NR_VECTORS];
+DECLARE_PER_CPU(vector_irq_t, vector_irq);
 #define IO_APIC_VECTOR(irq)     (irq_vector[irq])
 
 /*