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Merge branch 'clocksource.2022.02.01b' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into timers/core

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Pull clocksource watchdog update from Paul McKenney:

 - Add a config option for the maximum skew of the watchdog.

Link: https://lore.kernel.org/r/20220224000718.GA3747431@paulmck-ThinkPad-P17-Gen-1
This commit is contained in:
Thomas Gleixner 2022-03-07 19:12:38 +01:00
commit 58dedf0a47
2 changed files with 16 additions and 1 deletions
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9
kernel/time/Kconfig
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@ -181,5 +181,14 @@ config HIGH_RES_TIMERS
hardware is not capable then this option only increases
the size of the kernel image.
config CLOCKSOURCE_WATCHDOG_MAX_SKEW_US
int "Clocksource watchdog maximum allowable skew (in μs)"
depends on CLOCKSOURCE_WATCHDOG
range 50 1000
default 100
help
Specify the maximum amount of allowable watchdog skew in
microseconds before reporting the clocksource to be unstable.
endmenu
endif

8
kernel/time/clocksource.c
View File

@ -107,7 +107,13 @@ static u64 suspend_start;
* This delay could be due to SMIs, NMIs, or to VCPU preemptions. Used as
* a lower bound for cs->uncertainty_margin values when registering clocks.
*/
#define WATCHDOG_MAX_SKEW (100 * NSEC_PER_USEC)
#ifdef CONFIG_CLOCKSOURCE_WATCHDOG_MAX_SKEW_US
#define MAX_SKEW_USEC CONFIG_CLOCKSOURCE_WATCHDOG_MAX_SKEW_US
#else
#define MAX_SKEW_USEC 100
#endif
#define WATCHDOG_MAX_SKEW (MAX_SKEW_USEC * NSEC_PER_USEC)
#ifdef CONFIG_CLOCKSOURCE_WATCHDOG
static void clocksource_watchdog_work(struct work_struct *work);