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authorjohn stultz <johnstul@us.ibm.com>2009-08-17 16:40:47 -0700
committerThomas Gleixner <tglx@linutronix.de>2009-08-28 21:13:05 +0200
commitd3b8f889a220aed825accc28eb64ce283a0d51ac (patch)
tree6d66dbb21c7b0c53813231a68a5b841394783aed /Documentation/kernel-parameters.txt
parent326ba5010a5429a5a528b268b36a5900d4ab0eba (diff)
downloadlinux-linaro-android-d3b8f889a220aed825accc28eb64ce283a0d51ac.tar.gz
x86: Make tsc=reliable override boot time stability checks
This patch makes the tsc=reliable option disable the boot time stability checks. Currently the option only disables the runtime watchdog checks. This change allows folks who want to override the boot time TSC stability checks and use the TSC when the system would otherwise disqualify it. There still are some situations that the TSC will be disqualified, such as cpufreq scaling. But these are situations where the box will hang if allowed. Patch also includes a fix for an issue found by Thomas Gleixner, where the TSC disqualification message wouldn't be printed after a call to unsynchronized_tsc(). Signed-off-by: John Stultz <johnstul@us.ibm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: akataria@vmware.com Cc: Stephen Hemminger <shemminger@vyatta.com> LKML-Reference: <1250552447.7212.92.camel@localhost.localdomain> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt9
1 files changed, 5 insertions, 4 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 7936b801fe6..4c6b4150266 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2484,12 +2484,13 @@ and is between 256 and 4096 characters. It is defined in the file
Format:
<io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq>
- tsc= Disable clocksource-must-verify flag for TSC.
+ tsc= Disable clocksource stability checks for TSC.
Format: <string>
[x86] reliable: mark tsc clocksource as reliable, this
- disables clocksource verification at runtime.
- Used to enable high-resolution timer mode on older
- hardware, and in virtualized environment.
+ disables clocksource verification at runtime, as well
+ as the stability checks done at bootup. Used to enable
+ high-resolution timer mode on older hardware, and in
+ virtualized environment.
turbografx.map[2|3]= [HW,JOY]
TurboGraFX parallel port interface