clocksource: Limit the number of watchdogged clocksources
When TSC is deemed trustworthy, the clocksource watchdog will verify
other clocksources against it. @@@ Why limit it? Needed from Waiman.
Maybe overhead and disturbance of additional checks? @@@
Therefore, supply a new tsc_watchdogged kernel boot parameter that
limits the number of clocksources that will be verified against TSC.
This parameter defaults to INT_MAX. A value of zero prevents any
verification.
Link: https://lore.kernel.org/all/a82092f5-abc8-584f-b2ba-f06c82ffbe7d@redhat.com/
Reported-by: Waiman Long <longman@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Waiman Long <longman@redhat.com
Cc: <x86@kernel.org>
5 files changed
