[PATCH] trivial patch for xm debug-key t

["Dan Magenheimer" <dan.magenheimer@oracle.com>]

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This trivial patch ensures interrupts don't adversely affect
the intra-processor stime skew data collected by "xm debug-key t"

Dan

===================================
Thanks... for the memory
I really could use more / My throughput's on the floor
The balloon is flat / My swap disk's fat / I've OOM's in store
Overcommitted so much
(with apologies to the late great Bob Hope)

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diff -r 092a15aa2430 xen/common/keyhandler.c
--- a/xen/common/keyhandler.c	Fri Jul 18 15:03:55 2008 +0100
+++ b/xen/common/keyhandler.c	Sat Jul 19 10:11:43 2008 -0600
@@ -240,10 +240,12 @@ static void read_clocks_slave(void *unus
 static void read_clocks_slave(void *unused)
 {
     unsigned int cpu = smp_processor_id();
+    local_irq_disable();
     while ( !cpu_isset(cpu, read_clocks_cpumask) )
         cpu_relax();
     read_clocks_time[cpu] = NOW();
     cpu_clear(cpu, read_clocks_cpumask);
+    local_irq_enable();
 }
 
 static void read_clocks(unsigned char key)

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