From: Ingo Molnar <mingo@elte.hu>
Date: Wed, 30 Jan 2008 12:33:24 +0000 (+0100)
Subject: x86: add warning to check_tsc_warp()
X-Git-Tag: v2.6.25-rc1~1143^2~219
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=ad8ca495bd3e03e6751fc0c6a6af44018ebb4036;p=~shefty%2Frdma-dev.git

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>
---

diff --git a/arch/x86/kernel/tsc_sync.c b/arch/x86/kernel/tsc_sync.c
index 7110078f242..0577825cf89 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);
 	}
 }