[Xen-devel] [PATCH] fix check_tsc_warp bug

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

I wasn't able to easily test the check_tsc_warp patch on
a machine which did have skew, so I synthesized skew
and discovered this bug.

Signed-off-by: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>

diff -r f9cbb5a274d6 xen/arch/x86/time.c
--- a/xen/arch/x86/time.c       Wed Oct 07 10:26:39 2009 +0100
+++ b/xen/arch/x86/time.c       Wed Oct 07 14:40:02 2009 -0600
@@ -1494,7 +1494,7 @@ void check_tsc_warp(unsigned long tsc_kh
         if ( unlikely(prev > now) )
         {
             spin_lock(&sync_lock);
-            if ( *max_warp > prev - now )
+            if ( *max_warp < prev - now )
                 *max_warp = prev - now;
             spin_unlock(&sync_lock);
         }

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