[PATCH] genirq: x86_64 irq: Make the external irq handlers report their vector, not the irq number

This is a small pessimization but it paves the way for making this information
per cpu.  Which allows the the maximum number of IRQS to become NR_CPUS*224.

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, 6 insertions, 3 deletions

diff --git a/arch/x86_64/kernel/irq.c b/arch/x86_64/kernel/irq.c
index 609f97153b88..4542fb031994 100644
--- a/arch/x86_64/kernel/irq.c
+++ b/arch/x86_64/kernel/irq.c
@@ -105,7 +105,12 @@ skip:
 asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
 {       
         /* high bit used in ret_from_ code  */
-        unsigned irq = ~regs->orig_rax;
+        unsigned vector = ~regs->orig_rax;
+        unsigned irq;
+
+        exit_idle();
+        irq_enter();
+        irq = vector_irq[vector];
 
         if (unlikely(irq >= NR_IRQS)) {
                 printk(KERN_EMERG "%s: cannot handle IRQ %d\n",
@@ -113,8 +118,6 @@ asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
                 BUG();
         }
 
-        exit_idle();
-        irq_enter();
 #ifdef CONFIG_DEBUG_STACKOVERFLOW
         stack_overflow_check(regs);
 #endif