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From: Muchun Song <muchun.song@linux.dev>
To: Muchun Song <songmuchun@bytedance.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>,
	Mike Rapoport <rppt@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Hildenbrand <david@kernel.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Nicholas Piggin <npiggin@gmail.com>,
	Christophe Leroy <chleroy@kernel.org>,
	Ritesh Harjani <ritesh.list@gmail.com>,
	Shrikanth Hegde <sshegde@linux.ibm.com>,
	Lorenzo Stoakes <ljs@kernel.org>,
	"Liam R . Howlett" <liam@infradead.org>,
	Vlastimil Babka <vbabka@kernel.org>,
	Suren Baghdasaryan <surenb@google.com>,
	Michal Hocko <mhocko@suse.com>, Qi Zheng <qi.zheng@linux.dev>,
	Lance Yang <lance.yang@linux.dev>,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org
Subject: Re: [PATCH v4 3/6] mm/sparse-vmemmap: drop Device DAX-specific population path
Date: Sat, 10 Oct 2026 16:37:35 +0800	[thread overview]
Message-ID: <42099448-FB7B-4885-9DE3-DBB6C96B88FF@linux.dev> (raw)
In-Reply-To: <20261010075755.83339-4-songmuchun@bytedance.com>



> On Oct 10, 2026, at 15:57, Muchun Song <songmuchun@bytedance.com> wrote:
> 
> The common vmemmap path selects the shared page for optimized mappings
> itself, so Device DAX no longer needs vmemmap_populate_compound_pages()
> to find a shared tail page and pass its backing PFN through the generic
> population helpers.
> 
> Remove the Device DAX-specific population path and let section memmap
> population always use vmemmap_populate(). The powerpc retains an
> architecture-specific compound-page implementation, so select it directly
> from radix__vmemmap_populate() for optimizable sections.

Regarding the issue mentioned by Sashiko [1], it does exist, but it
was not introduced by this series. I have already fixed it in another
series [2], but it has not been merged yet.

[1] https://sashiko.dev/#/patchset/20261010075755.83339-1-songmuchun%40bytedance.com?part=3
[2] https://lore.kernel.org/all/20260924025035.1265035-1-songmuchun@bytedance.com/

Thanks.

  reply	other threads:[~2026-10-10  8:38 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-10  7:57 [PATCH v4 0/6] mm: Unify device DAX and HugeTLB vmemmap population paths Muchun Song
2026-10-10  7:57 ` [PATCH v4 1/6] mm/sparse-vmemmap: drop VMEMMAP_POPULATE_DAX Muchun Song
2026-10-10  7:57 ` [PATCH v4 2/6] mm/sparse-vmemmap: support device DAX in common vmemmap path Muchun Song
2026-10-10  7:57 ` [PATCH v4 3/6] mm/sparse-vmemmap: drop Device DAX-specific population path Muchun Song
2026-10-10  8:37   ` Muchun Song [this message]
2026-10-10  7:57 ` [PATCH v4 4/6] mm/sparse-vmemmap: remove the unused ptpfn argument Muchun Song
2026-10-10  7:57 ` [PATCH v4 5/6] mm/sparse-vmemmap: open-code vmemmap_populate_address() Muchun Song
2026-10-10  7:57 ` [PATCH v4 6/6] mm/mm_init: add zone mismatch warning during page init Muchun Song
2026-10-10  9:32   ` Muchun Song
2026-10-10  9:58     ` Mike Rapoport
2026-10-10 10:33       ` Muchun Song
2026-10-10 11:55   ` [PATCH] fixup! " Muchun Song
2026-10-10 20:42 ` [PATCH v4 0/6] mm: Unify device DAX and HugeTLB vmemmap population paths Andrew Morton

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