diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2008-05-24 17:40:17 +0000 |
|---|---|---|
| committer | Chris Wright <chrisw@sous-sol.org> | 2008-06-09 11:27:02 -0700 |
| commit | 6bdb15cddf9d758c825cf28678d1f903104d2134 (patch) | |
| tree | 28a6160d3096a202b196410257e6d3f2a27d1112 | |
| parent | 94aa6550e8668fab1997e2d57a48b22cf68090b2 (diff) | |
x86: disable TSC for sched_clock() when calibration failed
upstream commit: 74dc51a3de06aa516e3b9fdc4017b2aeb38bf44b
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
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
| -rw-r--r-- | arch/x86/kernel/tsc_32.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kernel/tsc_32.c b/arch/x86/kernel/tsc_32.c index 021723ccd507..01e4f8b2624c 100644 --- a/arch/x86/kernel/tsc_32.c +++ b/arch/x86/kernel/tsc_32.c @@ -401,6 +401,11 @@ 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; } |