[Xen-changelog] [xen-unstable] x86: Continue to allocate vectors across LAPIC priority levels, since

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1223463541 -3600
# Node ID 26985a665ded8d225fa993591255374760d0c969
# Parent  51a05fb4c6014059058de48b83a9431e7474a456
x86: Continue to allocate vectors across LAPIC priority levels, since
it's easy to do. It's not really necessary for modern non-buggy APICs
though.

Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
 xen/arch/x86/io_apic.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff -r 51a05fb4c601 -r 26985a665ded xen/arch/x86/io_apic.c
--- a/xen/arch/x86/io_apic.c    Wed Oct 08 11:51:39 2008 +0100
+++ b/xen/arch/x86/io_apic.c    Wed Oct 08 11:59:01 2008 +0100
@@ -697,8 +697,9 @@ int assign_irq_vector(int irq)
 
     vector = current_vector;
     while (vector_irq[vector] != FREE_TO_ASSIGN) {
-        if (++vector > LAST_DYNAMIC_VECTOR)
-            vector = FIRST_DYNAMIC_VECTOR;
+        vector += 8;
+        if (vector > LAST_DYNAMIC_VECTOR)
+            vector = FIRST_DYNAMIC_VECTOR + ((vector + 1) & 7);
 
         if (vector == current_vector) {
             spin_unlock(&vector_lock);

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