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x86: disable TSC for sched_clock() when calibration failed

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When the TSC calibration fails then TSC is still used in
sched_clock(). Disable it completely in that case.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@kernel.org
This commit is contained in:
Thomas Gleixner 2008-05-18 22:17:59 +02:00
parent 9ccc906c97
commit 74dc51a3de
1 changed files with 5 additions and 0 deletions
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5
arch/x86/kernel/tsc_32.c
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@ -413,6 +413,11 @@ void __init tsc_init(void)
if (!cpu_khz) {
mark_tsc_unstable("could not calculate TSC khz");
/*
* We need to disable the TSC completely in this case
* to prevent sched_clock() from using it.
*/
tsc_disabled = 1;
return;
}