1 files changed, 28 insertions, 4 deletions

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index b10a5e1da06c..8a82728d47c1 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -281,7 +281,7 @@ EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);
 /* A cpu has been removed from cpu_online_mask.  Reset irq affinities. */
 void fixup_irqs(void)
 {
-        unsigned int irq;
+        unsigned int irq, vector;
         static int warned;
         struct irq_desc *desc;
 
@@ -336,9 +336,33 @@ void fixup_irqs(void)
                         printk("Cannot set affinity for irq %i\n", irq);
         }
 
-        /* That doesn't seem sufficient.  Give it 1ms. */
-        local_irq_enable();
+        /*
+         * We can remove mdelay() and then send spuriuous interrupts to
+         * new cpu targets for all the irqs that were handled previously by
+         * this cpu. While it works, I have seen spurious interrupt messages
+         * (nothing wrong but still...).
+         *
+         * So for now, retain mdelay(1) and check the IRR and then send those
+         * interrupts to new targets as this cpu is already offlined...
+         */
         mdelay(1);
-        local_irq_disable();
+
+        for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
+                unsigned int irr;
+
+                if (__get_cpu_var(vector_irq)[vector] < 0)
+                        continue;
+
+                irr = apic_read(APIC_IRR + (vector / 32 * 0x10));
+                if (irr  & (1 << (vector % 32))) {
+                        irq = __get_cpu_var(vector_irq)[vector];
+
+                        desc = irq_to_desc(irq);
+                        spin_lock(&desc->lock);
+                        if (desc->chip->retrigger)
+                                desc->chip->retrigger(irq);
+                        spin_unlock(&desc->lock);
+                }
+        }
 }
 #endif