Re: [PATCH 4/6] rust: hrtimer: Add HrTimerClockBase::time()

Lyude Paul
2025-04-09T18:39:51Z

On Tue, 2025-04-08 at 14:00 +0200, Andreas Hindborg wrote:
> "Lyude Paul" <lyude@redhat.com> writes:
>
> > This adds a wrapper for the get_time() callback contained within a
> > hrtimer_clock_base struct. We'll use this in the next commit in order to
> > implement HrTimerCallbackContext::forward_now().
> >
> > Signed-off-by: Lyude Paul <lyude@redhat.com>
> > ---
> > rust/kernel/time/hrtimer.rs | 10 ++++++++++
> > 1 file changed, 10 insertions(+)
> >
> > diff --git a/rust/kernel/time/hrtimer.rs b/rust/kernel/time/hrtimer.rs
> > index f633550882247..521ff1a8a5aa8 100644
> > --- a/rust/kernel/time/hrtimer.rs
> > +++ b/rust/kernel/time/hrtimer.rs
> > @@ -186,6 +186,16 @@ unsafe fn from_raw<'a>(ptr: *mut bindings::hrtimer_clock_base) -> &'a Self {
> > // - Our data layout is equivalent to said struct via our type invariants.
> > unsafe { &*ptr.cast() }
> > }
> > +
> > + /// Retrieve the current time from this [`HrTimerClockBase`].
> > + fn time(&self) -> Ktime {
> > + // SAFETY: This callback is initialized to a valid NonNull function for as long as this type
> > + // is exposed to users.
>
> Why is that? Is it by C api contract?

Correct - I will mention this in the safety comment for the next respin

>
>
> Best regards,
> Andreas Hindborg
>
>
>

--
Cheers,
Lyude Paul (she/her)
Software Engineer at Red Hat

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