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| author | Thomas Gleixner <tglx@kernel.org> | 2026-02-24 17:36:45 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2026-02-27 16:40:08 +0100 |
| commit | 89f951a1e8ad781e7ac70eccddab0e0c270485f9 (patch) | |
| tree | af97b4337cb404c048dcc2f908b698a7eed7d61e /kernel/time/Kconfig | |
| parent | cd38bdb8e696a1a1eb12fc6662a6e420977aacfd (diff) | |
| download | linux-next-89f951a1e8ad781e7ac70eccddab0e0c270485f9.tar.gz linux-next-89f951a1e8ad781e7ac70eccddab0e0c270485f9.zip | |
clockevents: Provide support for clocksource coupled comparators
Some clockevent devices are coupled to the system clocksource by
implementing a less than or equal comparator which compares the programmed
absolute expiry time against the underlying time counter.
The timekeeping core provides a function to convert and absolute
CLOCK_MONOTONIC based expiry time to a absolute clock cycles time which can
be directly fed into the comparator. That spares two time reads in the next
event progamming path, one to convert the absolute nanoseconds time to a
delta value and the other to convert the delta value back to a absolute
time value suitable for the comparator.
Provide a new clocksource callback which takes the absolute cycle value and
wire it up in clockevents_program_event(). Similar to clocksources allow
architectures to inline the rearm operation.
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260224163430.010425428@kernel.org
Diffstat (limited to 'kernel/time/Kconfig')
| -rw-r--r-- | kernel/time/Kconfig | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig index b51bc5625129..e1968ab8b37f 100644 --- a/kernel/time/Kconfig +++ b/kernel/time/Kconfig @@ -50,6 +50,10 @@ config GENERIC_CLOCKEVENTS_MIN_ADJUST config GENERIC_CLOCKEVENTS_COUPLED bool +config GENERIC_CLOCKEVENTS_COUPLED_INLINE + select GENERIC_CLOCKEVENTS_COUPLED + bool + # Generic update of CMOS clock config GENERIC_CMOS_UPDATE bool |