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>

1 files changed, 5 insertions, 4 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 7936b801fe6a..4c6b4150266d 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