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| author | Keir Fraser <keir.fraser@citrix.com> | 2009-10-08 08:51:51 +0100 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2009-10-08 08:51:51 +0100 |
| commit | e82a2fb6080fa6cdb9f4baaf101b438baea07fc9 (patch) | |
| tree | 50854756fb40e1a809e09d065eb48d9db65c73b9 | |
| parent | e9bb68a99b62baa638cadc587416471d11017c0f (diff) | |
| download | xen-e82a2fb6080fa6cdb9f4baaf101b438baea07fc9.tar.gz xen-e82a2fb6080fa6cdb9f4baaf101b438baea07fc9.tar.bz2 xen-e82a2fb6080fa6cdb9f4baaf101b438baea07fc9.zip | |
x86 tsc: Fix check_tsc_warp() bug and add copyright notice
Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
| -rw-r--r-- | xen/arch/x86/time.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c index 5a56b717c9..7f1a1153d7 100644 --- a/xen/arch/x86/time.c +++ b/xen/arch/x86/time.c @@ -1442,6 +1442,10 @@ struct tm wallclock_time(void) * TSC Reliability check */ +/* + * The Linux original version of this function is + * Copyright (c) 2006, Red Hat, Inc., Ingo Molnar + */ void check_tsc_warp(unsigned long tsc_khz, unsigned long *max_warp) { #define rdtsc_barrier() mb() @@ -1494,7 +1498,7 @@ void check_tsc_warp(unsigned long tsc_khz, unsigned long *max_warp) 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); } |