From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Muchun Song <songmuchun@bytedance.com>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Muchun Song <muchun.song@linux.dev>,
Arnd Bergmann <arnd@arndb.de>,
"Mike Rapoport (Microsoft)" <rppt@kernel.org>,
Huacai Chen <chenhuacai@kernel.org>,
WANG Xuerui <kernel@xen0n.name>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
Helge Deller <deller@gmx.de>,
linux-mm@kvack.org, linux-arch@vger.kernel.org,
loongarch@lists.linux.dev, linux-mips@vger.kernel.org,
linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/3] mm: generalize PUD page table allocation
Date: Mon, 26 Oct 2026 11:38:42 +0100 [thread overview]
Message-ID: <103481d2-f75a-4982-b9a1-3592cda8267a@kernel.org> (raw)
In-Reply-To: <20261014035910.687847-4-songmuchun@bytedance.com>
On 10/14/26 05:59, Muchun Song wrote:
> The generic PUD allocator assumes order-0 page tables and zero-valued empty
> entries. MIPS and LoongArch need pud_init() to install their invalid
> entries. MIPS also uses PUD_TABLE_ORDER to describe the allocation size.
>
> Default PUD_TABLE_ORDER to zero, honor architecture overrides, and invoke
> pud_init() from the generic allocator. MIPS and LoongArch can then drop
> their duplicate helpers and use the generic constructor handling and kernel
> ptdesc marking.
>
> This also switches their user PUD allocations from GFP_KERNEL to
> GFP_PGTABLE_USER, so they are accounted to the active memory cgroup
> context. Allocations for init_mm continue to use GFP_PGTABLE_KERNEL.
>
> Assisted-by: LLM
> Signed-off-by: Muchun Song <songmuchun@bytedance.com>
> ---
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
--
Cheers,
David
next prev parent reply other threads:[~2026-10-26 10:38 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-14 3:59 [PATCH 0/3] mm: Generalize page table allocation helpers Muchun Song
2026-10-14 3:59 ` [PATCH 1/3] mm: generalize kernel PTE table allocation Muchun Song
2026-10-26 10:37 ` David Hildenbrand (Arm)
2026-10-14 3:59 ` [PATCH 2/3] mm: generalize PMD page " Muchun Song
2026-10-26 10:38 ` David Hildenbrand (Arm)
2026-10-14 3:59 ` [PATCH 3/3] mm: generalize PUD " Muchun Song
2026-10-26 10:38 ` David Hildenbrand (Arm) [this message]
2026-10-15 8:33 ` [PATCH 0/3] mm: Generalize page table allocation helpers Mike Rapoport
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