[PATCH] clocksource/drivers/exynos_mct: Use percpu interrupts only on ARM64

[Marek Szyprowski]

On 24.09.2025 19:17, William McVicker wrote:
> On 09/24/2025, Daniel Lezcano wrote:
>> On 19/09/2025 23:31, Marek Szyprowski wrote:
>>> On 27.08.2025 13:58, Krzysztof Kozlowski wrote:
>>>> On 27/08/2025 12:26, Marek Szyprowski wrote:
>>>>> For some unknown reasons forcing percpu interrupts for local timers
>>>>> breaks CPU hotplug for 'little' cores on legacy ARM 32bit Exynos based
>>>>> machines (for example Exynos5422-based Odroid-XU3/XU4 boards). Use percpu
>>>>> flag only when driver is compiled for newer ARM64 architecture.
>>>>>
>>>>> Fixes: f3cec54ee3bf ("clocksource/drivers/exynos_mct: Set local timer interrupts as percpu")
>>>> I am pretty sure the patch above was not tested on arm32, thus this
>>>> workaround seems reasonable.
>>>>
>>>> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski at linaro.org>
>>> Daniel, any chance to get this merged?
>> The patch does not apply. However it is not your fault but a glitch in the
>> previous pull request and the regression found in the Exynos MCT.
>>
>> Apparently, Thomas had to drop the entire pull request while I thought he
>> dropped only Will's changes.
>>
>> A pull request with the previous changes for v6.17-rc1 and with the new
>> changes for v6.18-rc1 is about to be emitted but without the Exynos MCT
>> changes for the modularization. That means your change does not apply
>> correctly anymore on the current changes.
> Is there somewhere I can check to see which changes will be re-sent? I don't
> see them in the timers/drivers/next branch. Will it be patches 2-4 plus the
> fixes for the section mismatch and this new IRQ fix? Once that's all sorted
> out, I'll base the new modularization patches on top of that.

The problematic mct patches are still in linux-next, merged via tip tree 
by commit 9703240ef617 ("Merge branch into tip/master: 
'timers/clocksource'"). What are the plans to resolve this?

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland