On Tue, 26 May 2026 19:13:33 +0200, Thomas Gleixner wrote: > ktime_get_snapshot() provides a snapshot of the underlying clocksource > counter value and the corresponding CLOCK_MONOTONIC_RAW, CLOCK_REALTIME and > CLOCK_BOOTTIME timestamps. > > There is no usage of CLOCK_REALTIME and CLOCK_BOOTTIME at the same time and > CLOCK_BOOTTIME support was just added for the ARM64 KVM tracing mechanism, > which needs CLOCK_BOOTTIME and the underlying clocksource counter value. > > ktime_get_snapshot() is also not suitable for usage with CLOCK_AUX, but > that's a prerequisite to support PTP hardware timestamping for CLOCK_AUX > steering. > > As a first step, rename ktime_get_snapshot() to ktime_get_snapshot_id(), > which now takes a clockid argument to select the clock which needs to be > captured. The result is stored in system_time_snapshot::sys, which will > replace the system_time_snapshot::real/boot members once all usage sites > have been converted. > > ktime_get_snapshot() is a simple wrapper which hands in CLOCK_REALTIME as > clockid argument for the conversion period. That means CLOCK_REALTIME is > now captured twice, but that redunancy is only temporary. > > No functional change vs. current users of ktime_get_snapshot() > > Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: David Woodhouse <[email protected]> Tested-by: David Woodhouse <[email protected]>
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