[Xen-changelog] Just allocate unbound irq only from dynirq range, since

[Xen patchbot -3.0-testing <patchbot-3.0-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 490384f7d531e957c7a3ebf3999a124072b0609e
# Parent  557d9591e49117a8b9fdc6af52807babbe46a077
Just allocate unbound irq only from dynirq range, since
pirq range is reserved for physical devices. This saves
unnecessary checks on pirq range.

Signed-off-by Kevin Tian <kevin.tian@xxxxxxxxx>

diff -r 557d9591e491 -r 490384f7d531 
linux-2.6-xen-sparse/drivers/xen/core/evtchn.c
--- a/linux-2.6-xen-sparse/drivers/xen/core/evtchn.c    Thu Apr 27 09:39:14 
2006 +0100
+++ b/linux-2.6-xen-sparse/drivers/xen/core/evtchn.c    Thu Apr 27 09:44:28 
2006 +0100
@@ -226,7 +226,8 @@ static int find_unbound_irq(void)
 {
        int irq;
 
-       for (irq = 0; irq < NR_IRQS; irq++)
+       /* Only allocate from dynirq range */
+       for (irq = DYNIRQ_BASE; irq < NR_IRQS; irq++)
                if (irq_bindcount[irq] == 0)
                        break;
 

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