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

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Message-ID: <ef5d851b-0f67-410e-9479-0f6d344fa17b@arm.com>
Date: Fri, 3 Oct 2025 11:38:21 +0200
From: Kevin Brodsky <kevin.brodsky@....com>
To: Alexander Gordeev <agordeev@...ux.ibm.com>,
 Madhavan Srinivasan <maddy@...ux.ibm.com>,
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>
Cc: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 6/6] powerpc/64s: Do not re-activate batched TLB flush

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@...ux.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]. May I include this patch in v3?

- Kevin

[1]
https://lore.kernel.org/all/20250908073931.4159362-1-kevin.brodsky@arm.com/