From: sashiko-bot@kernel.org
To: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
Cc: "Heiko Carstens" <hca@linux.ibm.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
"Vasily Gorbik" <gor@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>,
linux-s390@vger.kernel.org
Subject: Re: [PATCH v3 06/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for sparc64
Date: Fri, 11 Sep 2026 19:51:31 +0000 [thread overview]
Message-ID: <20260911195131.B1D251F00899@smtp.kernel.org> (raw)
In-Reply-To: <20260911-rcu-pagetable-freeing-v3-6-7b8c86103821@kernel.org>
> Commit 4a0100f7546f ("sparc64: use RCU page table freeing") enabled
> CONFIG_MMU_GATHER_RCU_TABLE_FREE for SMP sparc64 architectures, expressly
> for GUP-fast page table walkers.
>
> Naturally, UP systems do not have to worry about concurrent GUP fast
> operations.
>
> However, CONFIG_PREEMPT_RCU is also available even on a UP system, so a
> future pure-RCU page table walker requires MMU_GATHER_RCU_TABLE_FREE to be
> enabled on UP, even if concurrent GUP fast is not possible there.
>
> To enable future pure-RCU page table walkers, enable
> MMU_GATHER_RCU_TABLE_FREE unconditionally.
>
> With this change, it is no longer necessary to have !CONFIG_SMP
> pgtable_free_tlb(), so also remove this now dead code.
>
> This forms part of an overall effort to switch every architecture to this
> mode.
>
> Acked-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
> Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20260911-rcu-pagetable-freeing-v3-0-7b8c86103821@kernel.org?part=6
next prev parent reply other threads:[~2026-09-11 19:51 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-11 19:36 [PATCH v3 00/12] mm: make userland page table freeing RCU-safe Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` [PATCH v3 01/12] mm/huge_memory: zap deposited page tables after an RCU grace period Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:50 ` sashiko-bot
2026-09-11 19:36 ` [PATCH v3 02/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for most 2-level architectures Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:53 ` sashiko-bot
2026-09-11 19:36 ` [PATCH v3 03/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for MMU riscv Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:49 ` sashiko-bot
2026-09-11 19:36 ` [PATCH v3 04/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for MMU arm Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:53 ` sashiko-bot
2026-09-11 19:36 ` [PATCH v3 05/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for arc, microblaze, xtensa Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:51 ` sashiko-bot
2026-09-11 19:36 ` [PATCH v3 06/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for sparc64 Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:51 ` sashiko-bot [this message]
2026-09-11 19:36 ` [PATCH v3 07/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for m68k-coldfire Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:50 ` sashiko-bot
2026-09-11 19:36 ` [PATCH v3 08/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for sh-X2 Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:52 ` sashiko-bot
2026-09-11 19:36 ` [PATCH v3 09/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for m68k-motorola Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:56 ` sashiko-bot
2026-09-11 19:36 ` [PATCH v3 10/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for sparc32 Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:58 ` sashiko-bot
2026-09-11 19:36 ` [PATCH v3 11/12] mm: make userland page table freeing RCU-safe Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:59 ` sashiko-bot
2026-09-11 19:36 ` [PATCH v3 12/12] mm: change the contract for free_pgtables(), update docs Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:36 ` Lorenzo Stoakes (ARM)
2026-09-11 19:54 ` sashiko-bot
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