From: Kevin Brodsky <kevin.brodsky@arm.com>
To: Muchun Song <songmuchun@bytedance.com>,
Andrew Morton <akpm@linux-foundation.org>
Cc: "David Hildenbrand" <david@kernel.org>,
"Oscar Salvador" <osalvador@suse.de>,
"Dave Hansen" <dave.hansen@intel.com>,
"Paul Walmsley" <pjw@kernel.org>,
"Palmer Dabbelt" <palmer@dabbelt.com>,
"Albert Ou" <aou@eecs.berkeley.edu>,
"Alexandre Ghiti" <alex@ghiti.fr>,
"Björn Töpel" <bjorn@rivosinc.com>,
"Catalin Marinas" <catalin.marinas@arm.com>,
"Will Deacon" <will@kernel.org>,
"Mark Rutland" <mark.rutland@arm.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
"Alistair Popple" <apopple@nvidia.com>,
linux-mm@kvack.org, linux-riscv@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, stable@vger.kernel.org,
"Muchun Song" <muchun.song@linux.dev>
Subject: Re: [PATCH v2 4/4] arm64/mm: fix destructor for unconstructed hotplug page tables
Date: Tue, 13 Oct 2026 17:46:40 +0200 [thread overview]
Message-ID: <9a36345e-5301-4636-aabe-557d923e61f9@arm.com> (raw)
In-Reply-To: <20261010112457.49485-5-songmuchun@bytedance.com>
On 10/10/2026 13:24, Muchun Song wrote:
> Commit c594b83457cc ("arm64: mm: call pagetable dtor when freeing
> hot-removed page tables") made free_hotplug_pgtable_page()
> unconditionally run the page-table destructor. This matches page
> tables allocated by the arm64 mapping code, which runs the
> corresponding constructors. However, arm64 also uses the generic
> sparse-vmemmap population code. Runtime intermediate page tables
> allocated by that code do not run a page-table constructor. Freeing
> one during memory hot-remove therefore runs a destructor without a
> matching constructor and corrupts NR_PAGETABLE accounting. Free
> intermediate page-table pages through pagetable_free(). It runs the
> destructor only for constructor-backed pages and then releases the
> page through the page-table freeing path. Fixes: c594b83457cc ("arm64:
> mm: call pagetable dtor when freeing hot-removed page tables") Cc:
> stable@vger.kernel.orgAssisted-by: LLM Signed-off-by: Muchun Song
> <songmuchun@bytedance.com>
Reviewed-by: Kevin Brodsky <kevin.brodsky@arm.com>
prev parent reply other threads:[~2026-10-13 15:46 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-10 11:24 [PATCH v2 0/4] mm: Fix page-table teardown during memory hot-remove Muchun Song
2026-10-10 11:24 ` [PATCH v2 1/4] mm: fix missing page-table destructor in pagetable_free() Muchun Song
2026-10-12 11:15 ` Jose A. Perez de Azpillaga
2026-10-12 12:55 ` Muchun Song
2026-10-12 17:21 ` Jose A. Perez de Azpillaga
2026-10-13 6:33 ` Muchun Song
2026-10-13 2:31 ` Andrew Morton
2026-10-13 2:50 ` Muchun Song
2026-10-13 3:25 ` Andrew Morton
2026-10-13 6:26 ` Muchun Song
2026-10-12 13:27 ` David Hildenbrand (Arm)
2026-10-12 13:29 ` Muchun Song
2026-10-12 14:06 ` Dave Hansen
2026-10-13 15:46 ` Kevin Brodsky
2026-10-10 11:24 ` [PATCH v2 2/4] riscv/mm: fix hotplug page-table destructor handling Muchun Song
2026-10-12 13:28 ` David Hildenbrand (Arm)
2026-10-12 15:32 ` Björn Töpel
2026-10-13 15:46 ` Kevin Brodsky
2026-10-10 11:24 ` [PATCH v2 3/4] riscv/mm: fix missing destructor for hotplug PUD tables Muchun Song
2026-10-12 15:35 ` Björn Töpel
2026-10-13 15:46 ` Kevin Brodsky
2026-10-10 11:24 ` [PATCH v2 4/4] arm64/mm: fix destructor for unconstructed hotplug page tables Muchun Song
2026-10-12 13:30 ` David Hildenbrand (Arm)
2026-10-13 15:46 ` Kevin Brodsky [this message]
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