Re: [PATCH v2 22/25] timekeeping: Rework timekeeping_suspend() to use shadow_timekeeper

[John Stultz]

On Wed, Oct 9, 2024 at 1:29 AM Anna-Maria Behnsen
<anna-maria@xxxxxxxxxxxxx> wrote:
>
> From: Anna-Maria Behnsen <anna-maria@xxxxxxxxxxxxx>
>
> Updates of the timekeeper can be done by operating on the shadow timekeeper
> and afterwards copying the result into the real timekeeper. This has the
> advantage, that the sequence count write protected region is kept as small
> as possible.
>
> While the sequence count held time is not relevant for the resume path as
> there is no concurrency, there is no reason to have this function
> different than all the other update sites.
>
> Convert timekeeping_inject_offset() to use this scheme and cleanup the
> variable declarations while at it.
>
> As halt_fast_timekeeper() does not need protection sequence counter, it is
> no problem to move it with this change outside of the sequence counter
> protected area. But it still needs to be executed while holding the lock.
>
> Signed-off-by: Anna-Maria Behnsen <anna-maria@xxxxxxxxxxxxx>

tk_shadow naming nit, but otherwise:
Acked-by: John Stultz <jstultz@xxxxxxxxxx>