1 files changed, 25 insertions, 5 deletions

diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index 6b5c730d67b9..3aac15466a91 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -20,6 +20,26 @@
 
 atomic_t irq_err_count;
 
+/*
+ * 'what should we do if we get a hw irq event on an illegal vector'.
+ * each architecture has to answer this themselves.
+ */
+void ack_bad_irq(unsigned int irq)
+{
+        printk(KERN_WARNING "unexpected IRQ trap at vector %02x\n", irq);
+        /*
+         * Currently unexpected vectors happen only on SMP and APIC.
+         * We _must_ ack these because every local APIC has only N
+         * irq slots per priority level, and a 'hanging, unacked' IRQ
+         * holds up an irq slot - in excessive cases (when multiple
+         * unexpected vectors occur) that might lock up the APIC
+         * completely.
+         * But don't ack when the APIC is disabled. -AK
+         */
+        if (!disable_apic)
+                ack_APIC_irq();
+}
+
 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 /*
  * Probabilistic stack overflow check:
@@ -33,11 +53,11 @@ static inline void stack_overflow_check(struct pt_regs *regs)
         u64 curbase = (u64)task_stack_page(current);
         static unsigned long warned = -60*HZ;
 
-        if (regs->rsp >= curbase && regs->rsp <= curbase + THREAD_SIZE &&
-            regs->rsp <  curbase + sizeof(struct thread_info) + 128 &&
+        if (regs->sp >= curbase && regs->sp <= curbase + THREAD_SIZE &&
+            regs->sp <  curbase + sizeof(struct thread_info) + 128 &&
             time_after(jiffies, warned + 60*HZ)) {
-                printk("do_IRQ: %s near stack overflow (cur:%Lx,rsp:%lx)\n",
-                       current->comm, curbase, regs->rsp);
+                printk("do_IRQ: %s near stack overflow (cur:%Lx,sp:%lx)\n",
+                       current->comm, curbase, regs->sp);
                 show_stack(NULL,NULL);
                 warned = jiffies;
         }
@@ -142,7 +162,7 @@ asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
         struct pt_regs *old_regs = set_irq_regs(regs);
 
         /* high bit used in ret_from_ code  */
-        unsigned vector = ~regs->orig_rax;
+        unsigned vector = ~regs->orig_ax;
         unsigned irq;
 
         exit_idle();