From: sashiko-bot@kernel.org
To: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
Cc: "Alexander Gordeev" <agordeev@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>,
"Vasily Gorbik" <gor@linux.ibm.com>,
linux-s390@vger.kernel.org, "Heiko Carstens" <hca@linux.ibm.com>
Subject: Re: [PATCH v3 08/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for sh-X2
Date: Fri, 11 Sep 2026 19:52:28 +0000 [thread overview]
Message-ID: <20260911195228.90B861F0089A@smtp.kernel.org> (raw)
In-Reply-To: <20260911-rcu-pagetable-freeing-v3-8-7b8c86103821@kernel.org>
> Currently, non-x2 sh specifies CONFIG_MMU_GATHER_RCU_TABLE_FREE allowing
> RCU page table freeing.
>
> sh-X2 is problematic because it utilises slab-allocated PMD page tables,
> and thus tlb_remove_ptdesc() cannot be used in these cases.
>
> All other sh variants are fine as commit e3ecf7c7d082 ("mm: pgtable:
> convert some architectures to use tlb_remove_ptdesc()") already converted
> page table freeing to use tlb_remove_ptdesc(), which does so after an RCU
> grace period when CONFIG_MMU_GATHER_RCU_TABLE_FREE is specified.
>
> Resolve this issue by firstly specifying CONFIG_HAVE_ARCH_TLB_REMOVE_TABLE
> for sh-X2, so the arch can provide its own __tlb_remove_table()
> implementation (called after the RCU grace period).
>
> [ ... ]
> 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=8
next prev parent reply other threads:[~2026-09-11 19:52 UTC|newest]
Thread overview: 28+ 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 ` [PATCH v3 01/12] mm/huge_memory: zap deposited page tables after an RCU grace period Lorenzo Stoakes (ARM)
2026-09-11 19:50 ` sashiko-bot
2026-09-16 14:42 ` David Hildenbrand (Arm)
2026-09-16 16:59 ` Lorenzo Stoakes (ARM)
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 19:53 ` 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 19:49 ` 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 19:53 ` 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 19:51 ` 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 19:51 ` sashiko-bot
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 19:50 ` 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 19:52 ` sashiko-bot [this message]
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 19:56 ` 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 19:58 ` 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 19:59 ` 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 19:54 ` sashiko-bot
2026-09-16 2:01 ` [PATCH v3 00/12] mm: make userland page table freeing RCU-safe Andrew Morton
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