[Xen-changelog] [xen staging] x86/IRQ: make fixup_irqs() skip unconnected internally used interrupts

[patchbot@xxxxxxx]

commit d2679f9834142d66af9dbadfa40d615128d9404f
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon Jul 22 11:45:58 2019 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jul 22 11:45:58 2019 +0200

    x86/IRQ: make fixup_irqs() skip unconnected internally used interrupts
    
    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 <jbeulich@xxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/irq.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c
index f5e31a1c9b..abd773f35d 100644
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -2464,8 +2464,20 @@ void fixup_irqs(const cpumask_t *mask, bool verbose)
         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. */
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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