Commit 74dc51a3 authored May 18, 2008 by Thomas Gleixner

x86: disable TSC for sched_clock() when calibration failed



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

parent 9ccc906c

arch/x86/kernel/tsc_32.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}