From ad8ca495bd3e03e6751fc0c6a6af44018ebb4036 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Wed, 30 Jan 2008 13:33:24 +0100
Subject: [PATCH] x86: add warning to check_tsc_warp()
add warning to check_tsc_warp() - if get_cycles() does not progress.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/kernel/tsc_sync.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/tsc_sync.c b/arch/x86/kernel/tsc_sync.c
index 7110078f242cd..0577825cf89ba 100644
--- a/arch/x86/kernel/tsc_sync.c
+++ b/arch/x86/kernel/tsc_sync.c
@@ -87,7 +87,11 @@ static __cpuinit void check_tsc_warp(void)
nr_warps++;
__raw_spin_unlock(&sync_lock);
}
-
+ }
+ if (!(now-start)) {
+ printk("Warning: zero tsc calibration delta: %Ld [max: %Ld]\n",
+ now-start, end-start);
+ WARN_ON(1);
}
}
--
GitLab