Re: [PATCH 6/6] powerpc/64s: Do not re-activate batched TLB flush

[Kevin Brodsky <kevin.brodsky@arm.com>]

On 07/10/2025 11:40, Ritesh Harjani (IBM) wrote:
> Kevin Brodsky <kevin.brodsky@arm.com> writes:
>
>> On 17/06/2025 17:11, Alexander Gordeev wrote:
>>> On Thu, Jun 12, 2025 at 07:36:13PM +0200, Alexander Gordeev wrote:
>>>> Since commit b9ef323ea168 ("powerpc/64s: Disable preemption in hash
>>>> lazy mmu mode") a task can not be preempted while in lazy MMU mode.
>>>> Therefore, the batch re-activation code is never called, so remove it.
>>>>
>>>> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
>>>> ---
>>>>  arch/powerpc/include/asm/thread_info.h |  2 --
>>>>  arch/powerpc/kernel/process.c          | 25 -------------------------
>>>>  2 files changed, 27 deletions(-)
>>> Hi All,
>>>
>>> (I trimmed non-ppc mailing lists/people).
>>>
>>> The whole series does not seem to make it, but this patch alone is still
>>> applicable and makes sence, if I am not mistaken.
>> Yes, I agree. I arrived at the same conclusion working on the next
>> version of the nested lazy_mmu series [1].
>> [1]
>> https://lore.kernel.org/all/20250908073931.4159362-1-kevin.brodsky@arm.com/
> Yes, we disable preemption while in lazy mmu mode for Hash, so I agree that
> we won't call into __switch_to() in between preempt_disable()/_enable().
> So it does look like that we don't need that code.

Thanks for confirming.

>> May I include this patch in v3?
>>
> That should be ok.

Thanks!

- Kevin