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authorLinus Torvalds <torvalds@linux-foundation.org>2021-06-29 12:31:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-06-29 12:31:16 -0700
commita941a0349cf11ed250a04864fef268c2e05a1d32 (patch)
treeca8889cb16b651bdd49635c53f0a5211e31194ee /lib
parent21edf50948728f55b685ad95f196ba46196eb767 (diff)
parent2d0a9eb23ccfdf11308bec6db0bc007585d919d2 (diff)
Merge tag 'timers-core-2021-06-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer updates from Thomas Gleixner: "Time and clocksource/clockevent related updates: Core changes: - Infrastructure to support per CPU "broadcast" devices for per CPU clockevent devices which stop in deep idle states. This allows us to utilize the more efficient architected timer on certain ARM SoCs for normal operation instead of permanentely using the slow to access SoC specific clockevent device. - Print the name of the broadcast/wakeup device in /proc/timer_list - Make the clocksource watchdog more robust against delays between reading the current active clocksource and the watchdog clocksource. Such delays can be caused by NMIs, SMIs and vCPU preemption. Handle this by reading the watchdog clocksource twice, i.e. before and after reading the current active clocksource. In case that the two watchdog reads shows an excessive time delta, the read sequence is repeated up to 3 times. - Improve the debug output and add a test module for the watchdog mechanism. - Reimplementation of the venerable time64_to_tm() function with a faster and significantly smaller version. Straight from the source, i.e. the author of the related research paper contributed this! Driver changes: - No new drivers, not even new device tree bindings! - Fixes, improvements and cleanups and all over the place" * tag 'timers-core-2021-06-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (30 commits) time/kunit: Add missing MODULE_LICENSE() time: Improve performance of time64_to_tm() clockevents: Use list_move() instead of list_del()/list_add() clocksource: Print deviation in nanoseconds when a clocksource becomes unstable clocksource: Provide kernel module to test clocksource watchdog clocksource: Reduce clocksource-skew threshold clocksource: Limit number of CPUs checked for clock synchronization clocksource: Check per-CPU clock synchronization when marked unstable clocksource: Retry clock read if long delays detected clockevents: Add missing parameter documentation clocksource/drivers/timer-ti-dm: Drop unnecessary restore clocksource/arm_arch_timer: Improve Allwinner A64 timer workaround clocksource/drivers/arm_global_timer: Remove duplicated argument in arm_global_timer clocksource/drivers/arm_global_timer: Make symbol 'gt_clk_rate_change_nb' static arm: zynq: don't disable CONFIG_ARM_GLOBAL_TIMER due to CONFIG_CPU_FREQ anymore clocksource/drivers/arm_global_timer: Implement rate compensation whenever source clock changes clocksource/drivers/ingenic: Rename unreasonable array names clocksource/drivers/timer-ti-dm: Save and restore timer TIOCP_CFG clocksource/drivers/mediatek: Ack and disable interrupts on suspend clocksource/drivers/samsung_pwm: Constify source IO memory ...
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug12
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index a0e1910d0a16..b9e223b08586 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2573,6 +2573,18 @@ config TEST_FPU
If unsure, say N.
+config TEST_CLOCKSOURCE_WATCHDOG
+ tristate "Test clocksource watchdog in kernel space"
+ depends on CLOCKSOURCE_WATCHDOG
+ help
+ Enable this option to create a kernel module that will trigger
+ a test of the clocksource watchdog. This module may be loaded
+ via modprobe or insmod in which case it will run upon being
+ loaded, or it may be built in, in which case it will run
+ shortly after boot.
+
+ If unsure, say N.
+
endif # RUNTIME_TESTING_MENU
config ARCH_USE_MEMTEST