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[Xen-devel] [PATCH] x86: fix off-by-one in nr_irqs_gsi calculation


  • To: "xen-devel" <xen-devel@xxxxxxxxxxxxx>
  • From: "Jan Beulich" <JBeulich@xxxxxxxx>
  • Date: Thu, 26 Jul 2012 16:06:48 +0100
  • Delivery-date: Thu, 26 Jul 2012 15:07:00 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>

highest_gsi() returns the last valid GSI, not a count.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/io_apic.c
+++ b/xen/arch/x86/io_apic.c
@@ -2531,7 +2531,9 @@ void __init init_ioapic_mappings(void)
         }
     }
 
-    nr_irqs_gsi = max(nr_irqs_gsi, highest_gsi());
+    i = highest_gsi();
+    if ( i >= nr_irqs_gsi )
+        nr_irqs_gsi = i + 1;
 
     if ( max_gsi_irqs == 0 )
         max_gsi_irqs = nr_irqs ? nr_irqs / 8 : PAGE_SIZE;



Attachment: x86-nr_irqs_gsi.patch
Description: Text document

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