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The cross-timestamp mechanism which allows to correlate hardware
clocks uses clocksource pointers for describing the correlation.
That's suboptimal as drivers need to obtain the pointer, which requires
needless exports and exposing internals.
This can be completely avoided by assigning clocksource IDs and using
them for describing the correlated clock source.
This update adds clocksource IDs to all clocksources in the tree which
can be exposed to this mechanism and removes the pointer and now needless
exports.
This is separate from the timer core changes as it was provided to the
PTP folks to build further changes on top.
A related improvement for the core and the correlation handling has not
made it this time, but is expected to get ready for the next round.
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Merge tag 'timers-ptp-2024-03-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull clocksource updates from Thomas Gleixner:
"Updates for timekeeping and PTP core.
The cross-timestamp mechanism which allows to correlate hardware
clocks uses clocksource pointers for describing the correlation.
That's suboptimal as drivers need to obtain the pointer, which
requires needless exports and exposing internals. This can all be
completely avoided by assigning clocksource IDs and using them for
describing the correlated clock source.
So this adds clocksource IDs to all clocksources in the tree which can
be exposed to this mechanism and removes the pointer and now needless
exports.
A related improvement for the core and the correlation handling has
not made it this time, but is expected to get ready for the next
round"
* tag 'timers-ptp-2024-03-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
kvmclock: Unexport kvmclock clocksource
treewide: Remove system_counterval_t.cs, which is never read
timekeeping: Evaluate system_counterval_t.cs_id instead of .cs
ptp/kvm, arm_arch_timer: Set system_counterval_t.cs_id to constant
x86/kvm, ptp/kvm: Add clocksource ID, set system_counterval_t.cs_id
x86/tsc: Add clocksource ID, set system_counterval_t.cs_id
timekeeping: Add clocksource ID to struct system_counterval_t
x86/tsc: Correct kernel-doc notation
80a76c60e5