[Xen-changelog] [xen-unstable] x86: reprogram LAPIC timer in pit_broadcast_exit

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

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1217324550 -3600
# Node ID 9454fae58cb83ad678492879e82ecef2eab08705
# Parent  507045f254e91bd19251c7b327be8f0540561c0d
x86: reprogram LAPIC timer in pit_broadcast_exit

Thus to remove possible timer expiring delay caused by deep C state
LAPIC timer stopping.

Signed-off-by: Wei Gang <gang.wei@xxxxxxxxx>
---
 xen/arch/x86/time.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletion(-)

diff -r 507045f254e9 -r 9454fae58cb8 xen/arch/x86/time.c
--- a/xen/arch/x86/time.c       Tue Jul 29 10:41:41 2008 +0100
+++ b/xen/arch/x86/time.c       Tue Jul 29 10:42:30 2008 +0100
@@ -1135,7 +1135,10 @@ void pit_broadcast_enter(void)
 
 void pit_broadcast_exit(void)
 {
-    cpu_clear(smp_processor_id(), pit_broadcast_mask);
+    int cpu = smp_processor_id();
+
+    if ( cpu_test_and_clear(cpu, pit_broadcast_mask) )
+        reprogram_timer(per_cpu(timer_deadline, cpu));
 }
 
 int pit_broadcast_is_available(void)

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