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From: Lance Yang <lance.yang@linux.dev>
To: songmuchun@bytedance.com
Cc: david@kernel.org, maddy@linux.ibm.com, rppt@kernel.org,
	akpm@linux-foundation.org, lance.yang@linux.dev,
	mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org,
	ritesh.list@gmail.com, sshegde@linux.ibm.com, osalvador@suse.de,
	qi.zheng@linux.dev, muchun.song@linux.dev, chenhuacai@kernel.org,
	kernel@xen0n.name, linux-mm@kvack.org,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-riscv@lists.infradead.org, x86@kernel.org,
	loongarch@lists.linux.dev, linux-s390@vger.kernel.org
Subject: Re: [PATCH v3 2/5] powerpc/mm: drop powerpc vmemmap_can_optimize()
Date: Mon,  9 Nov 2026 12:26:47 +0800	[thread overview]
Message-ID: <20261109042647.37323-1-lance.yang@linux.dev> (raw)
In-Reply-To: <20261107043122.25650-3-songmuchun@bytedance.com>


On Sat, Nov 07, 2026 at 12:31:19PM +0800, Muchun Song wrote:
>Whether the optimized mapping can be used is now decided in the
>architecture-specific vmemmap_populate() path. When PowerPC has to fall
>back, such as on Hash MMU, it can disable optimization for the populated
>vmemmap range there.
>
>Add section_vmemmap_optimization_disable() to centralize this fallback,
>use it in the Hash MMU path, and drop the radix-specific
>vmemmap_can_optimize() override.
>
>Signed-off-by: Muchun Song <songmuchun@bytedance.com>
>---

LGTM, feel free to add:

Reviewed-by: Lance Yang <lance.yang@linux.dev>

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WARNING: multiple messages have this Message-ID (diff)
From: Lance Yang <lance.yang@linux.dev>
To: songmuchun@bytedance.com
Cc: david@kernel.org, maddy@linux.ibm.com, rppt@kernel.org,
	akpm@linux-foundation.org, lance.yang@linux.dev,
	mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org,
	ritesh.list@gmail.com, sshegde@linux.ibm.com, osalvador@suse.de,
	qi.zheng@linux.dev, muchun.song@linux.dev, chenhuacai@kernel.org,
	kernel@xen0n.name, linux-mm@kvack.org,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-riscv@lists.infradead.org, x86@kernel.org,
	loongarch@lists.linux.dev, linux-s390@vger.kernel.org
Subject: Re: [PATCH v3 2/5] powerpc/mm: drop powerpc vmemmap_can_optimize()
Date: Mon,  9 Nov 2026 12:26:47 +0800	[thread overview]
Message-ID: <20261109042647.37323-1-lance.yang@linux.dev> (raw)
In-Reply-To: <20261107043122.25650-3-songmuchun@bytedance.com>


On Sat, Nov 07, 2026 at 12:31:19PM +0800, Muchun Song wrote:
>Whether the optimized mapping can be used is now decided in the
>architecture-specific vmemmap_populate() path. When PowerPC has to fall
>back, such as on Hash MMU, it can disable optimization for the populated
>vmemmap range there.
>
>Add section_vmemmap_optimization_disable() to centralize this fallback,
>use it in the Hash MMU path, and drop the radix-specific
>vmemmap_can_optimize() override.
>
>Signed-off-by: Muchun Song <songmuchun@bytedance.com>
>---

LGTM, feel free to add:

Reviewed-by: Lance Yang <lance.yang@linux.dev>


  parent reply	other threads:[~2026-11-09  4:27 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-11-07  4:31 [PATCH v3 0/5] mm: Simplify device DAX vmemmap optimization plumbing Muchun Song
2026-11-07  4:31 ` Muchun Song
2026-11-07  4:31 ` [PATCH v3 1/5] powerpc/mm: make vmemmap_populate_compound_pages() static Muchun Song
2026-11-07  4:31   ` Muchun Song
2026-11-07 17:22   ` Oscar Salvador (SUSE)
2026-11-07 17:22     ` Oscar Salvador (SUSE)
2026-11-07  4:31 ` [PATCH v3 2/5] powerpc/mm: drop powerpc vmemmap_can_optimize() Muchun Song
2026-11-07  4:31   ` Muchun Song
2026-11-07 17:41   ` Oscar Salvador (SUSE)
2026-11-07 17:41     ` Oscar Salvador (SUSE)
2026-11-09  4:26   ` Lance Yang [this message]
2026-11-09  4:26     ` Lance Yang
2026-11-07  4:31 ` [PATCH v3 3/5] loongarch/mm: disable device DAX vmemmap optimization Muchun Song
2026-11-07  4:31   ` Muchun Song
2026-11-09  4:33   ` Lance Yang
2026-11-09  4:33     ` Lance Yang
2026-11-07  4:31 ` [PATCH v3 4/5] mm/sparse-vmemmap: drop vmemmap_can_optimize() Muchun Song
2026-11-07  4:31   ` Muchun Song
2026-11-09  5:48   ` Lance Yang
2026-11-09  5:48     ` Lance Yang
2026-11-09  9:20   ` Oscar Salvador (SUSE)
2026-11-09  9:20     ` Oscar Salvador (SUSE)
2026-11-07  4:31 ` [PATCH v3 5/5] mm/sparse-vmemmap: drop @pgmap from vmemmap population APIs Muchun Song
2026-11-07  4:31   ` Muchun Song
2026-11-09  6:16   ` Lance Yang
2026-11-09  6:16     ` Lance Yang
2026-11-09  9:24   ` Oscar Salvador (SUSE)
2026-11-09  9:24     ` Oscar Salvador (SUSE)

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