From a25036dbbf56f23d1b3d4624e2e775ffc5fba9b9 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Thu, 13 Apr 2017 14:56:44 +0200 Subject: [PATCH] x86/tsc: Provide 'tsc=unstable' boot parameter [ Upstream commit 8309f86cd41e8714526867177facf7a316d9be53 ] Since the clocksource watchdog will only detect broken TSC after the fact, all TSC based clocks will likely have observed non-continuous values before/when switching away from TSC. Therefore only thing to fully avoid random clock movement when your BIOS randomly mucks with TSC values from SMI handlers is reporting the TSC as unstable at boot. Signed-off-by: Peter Zijlstra (Intel) Cc: Linus Torvalds Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin --- arch/x86/kernel/tsc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index 21187ebee7d09..37bae0d677143 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -356,6 +356,8 @@ static int __init tsc_setup(char *str) tsc_clocksource_reliable = 1; if (!strncmp(str, "noirqtime", 9)) no_sched_irq_time = 1; + if (!strcmp(str, "unstable")) + mark_tsc_unstable("boot parameter"); return 1; } -- 2.50.1