Commit 74dc51a3 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

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: default avatarThomas 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;

	}