[v4,09/13] x86/IRQ: make fixup_irqs() skip unconnected internally used interrupts

Commit Message

Jan Beulich July 16, 2019, 7:42 a.m. UTC

Since the "Cannot set affinity ..." warning is a one time one, avoid
triggering it already at boot time when parking secondary threads and
the serial console uses a (still unconnected at that time) PCI IRQ.

Signed-off-by: Jan Beulich <[e-mail]>
Reviewed-by: Roger Pau Monné <[e-mail]>
Acked-by: Andrew Cooper <[e-mail]>

Patch

--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -2472,8 +2472,20 @@  void fixup_irqs(const cpumask_t *mask, b
          vector = irq_to_vector(irq);
          if ( vector >= FIRST_HIPRIORITY_VECTOR &&
               vector <= LAST_HIPRIORITY_VECTOR )
+        {
              cpumask_and(desc->arch.cpu_mask, desc->arch.cpu_mask, mask);
  
+            /*
+             * This can in particular happen when parking secondary threads
+             * during boot and when the serial console wants to use a PCI IRQ.
+             */
+            if ( desc->handler == &no_irq_type )
+            {
+                spin_unlock(&desc->lock);
+                continue;
+            }
+        }
+
          if ( desc->arch.move_cleanup_count )
          {
              /* The cleanup IPI may have got sent while we were still online. */