Re: [PATCH v9] rust: sync: condvar: use Delta<Jiffy> for timeout and result

[Alice Ryhl <aliceryhl@google.com>]

On Mon, Nov 02, 2026 at 07:51:29AM -0800, Boqun Feng wrote:
> On Mon, Nov 02, 2026 at 12:59:34PM +0900, FUJITA Tomonori wrote:
> > Update the only user, binder. It now converts the freeze timeout with
> > Delta::to_jiffies_timeout() instead of msecs_to_jiffies(). Both round
> > up, so a short timeout does not become zero. They differ only for a
> > very long timeout. msecs_to_jiffies() returns MAX_JIFFY_OFFSET for
> > 2^31 ms (about 24.9 days) or more, which means an infinite
> > timeout. to_jiffies_timeout() has no such special case. It converts
> > such a value to the matching number of jiffies, so the wait is long
> > but finite.
> > 
> > Reviewed-by: Gary Guo <gary@garyguo.net>
> > Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
> 
> Thanks. Alice, any concern regarding the change in binder?
> 
> I have some naming suggestion, please see below:
> 
> > ---
> >  drivers/android/binder/process.rs |  7 ++++---
> >  rust/kernel/sync/condvar.rs       | 31 ++++++++++++++++++++++---------
> >  2 files changed, 26 insertions(+), 12 deletions(-)
> > 
> > diff --git a/drivers/android/binder/process.rs b/drivers/android/binder/process.rs
> > index 1f4cb43f1de6..edde0ea35687 100644
> > --- a/drivers/android/binder/process.rs
> > +++ b/drivers/android/binder/process.rs
> > @@ -1552,8 +1553,8 @@ pub(crate) fn ioctl_freeze(&self, info: &BinderFreezeInfo) -> Result {
> >          inner.is_frozen = IsFrozen::InProgress;
> >  
> >          if info.timeout_ms > 0 {
> > -            let mut jiffies = kernel::time::msecs_to_jiffies(info.timeout_ms);
> > -            while jiffies > 0 {
> > +            let mut jiffies = Delta::from_millis(info.timeout_ms.into()).to_jiffies_timeout();
> 
> I would rename this variable to `timeout`, i.e.
> 
> 	let timeout = Delta::from_millis(info.timeout_ms.into()).to_jiffies_timeout();
> 
> Thoughts?

No concerns from me; the binder change and your naming suggestions look
good to me.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>

Alice