Re: [PATCH v7 1/1] pps: pps-gpio: split IRQ handler into hardirq timestamper + threaded handler

[Michael Byczkowski]

Dear All,

Now that 7.2-rc1 is out and this didn't make the merge window, could someone please confirm which tree will carry this for 7.3?
So far, the patch has been:
    • Reviewed-by: Sebastian Andrzej Siewior (Jun 2)
    • Acked-by: Rodolfo Giometti (PPS maintainer, from earlier revisions)
    • Tested-by from Calvin Owens and myself

I'm not sure whether it should go via drivers/pps (Rodolfo), the rt tree, or -mm. Happy to help route it wherever makes sense.
lore: https://lore.kernel.org/lkml/79BC1B96-FD2C-4191-8766-6C46BF8A1089@xxxxxxxxxxxx/

Thank you very much and best regards,
Michael



> On 3. Jun 2026, at 19:29, Michael Byczkowski <by@xxxxxxxxxxxx> wrote:
> 
> Thank you Sebastian, and thank you Calvin for relaying. I appreciate the
> thorough review that got this to the right shape.
> 
> Best regards,
> Michael
> 
> 
>> On 2. Jun 2026, at 08:36, Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> wrote:
>> 
>> On 2026-06-01 17:44:09 [-0700], Calvin Owens wrote:
>>> From: Michael Byczkowski <by@xxxxxxxxxxxx>
>>> 
>>> Split the pps-gpio interrupt handler into a primary (hardirq) handler
>>> that captures the PPS timestamp at interrupt entry, and a threaded
>>> handler that processes the event. This produces the same two-part
>>> handler structure on both PREEMPT_RT and non-RT kernels.
>>> 
>>> On non-RT kernels the threaded portion runs immediately after the
>>> primary, with no behavioral change compared to the previous
>>> single-handler implementation.
>>> 
>>> On PREEMPT_RT, where interrupt handlers are force-threaded by default,
>>> the previous single-handler implementation captured the timestamp
>>> inside the threaded portion, after IRQ-thread scheduling delay. With
>>> the split, the timestamp is captured in true hardirq context as it is
>>> on non-RT kernels, eliminating a significant source of PPS jitter on
>>> RT systems.
>>> 
>>> Tested-by: Michael Byczkowski <by@xxxxxxxxxxxx>
>>> Tested-by: Calvin Owens <calvin@xxxxxxxxxx>
>>> Acked-by: Rodolfo Giometti <giometti@xxxxxxxxxxxx>
>>> Signed-off-by: Michael Byczkowski <by@xxxxxxxxxxxx>
>>> Signed-off-by: Calvin Owens <calvin@xxxxxxxxxx>
>>> ---
>> 
>> Reviewed-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
>> 
>> Sebastian
>