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Tue, 29 Sep 2026 07:43:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2393E1F000FF; Tue, 29 Sep 2026 07:43:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790667796; bh=l3uGJBgDueAYQpQ6UNN5wXxoFfi297uAcZttSK4/i90=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=mJschNlBhoq9JKJyXT7dxafC1SkgQ74/itXQ7YwoOf11UukAMavZEzlz8PtWHfAno SYhiTLj5jpURd1SowXyoIu2+Gwvol8zbHo91ZzqUSOsgnxKYa6ELES9UWm/7/P5tkA zdDL0MswCGxbxULsDOWRMheevjty+5eUD4shlcnarGIbO+XJpSDYVd4c2TDUdw3vfb FPX8+F1xS5SUJBU5R4Cg2hiqlUT6ia6fW/NQenc+kUfadGKMWypBlvGiJxGuvDKqsV 4MEB0Z8KPhQkF0PC3/501YPQrx5JRUtNETEuL77Yd7cB/n7vryd4mFKMkofjhhQIfL OTqFoxUtsHukA== Message-ID: <118caa06-71cf-432a-a7d4-d721e86cd905@kernel.org> Date: Tue, 29 Sep 2026 09:43:10 +0200 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 12/12] Documentation/mm: update DAX vmemmap deduplication docs To: Muchun Song , Andrew Morton , Oscar Salvador , Madhavan Srinivasan , Michael Ellerman , Jonathan Corbet Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-doc@vger.kernel.org, Muchun Song , Lorenzo Stoakes , Mike Rapoport , Qi Zheng , Nicholas Piggin , Christophe Leroy , Randy Dunlap , Lance Yang References: <20260927025441.741633-1-songmuchun@bytedance.com> <20260927025441.741633-13-songmuchun@bytedance.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 9/27/26 04:54, Muchun Song wrote: > Device DAX now uses the common per-zone shared tail page for vmemmap > deduplication. The old documentation still described a DAX-specific > layout with a separately populated tail vmemmap page and half the HugeTLB > savings. > > Update the generic and powerpc documentation to describe the shared layout. > In the powerpc document, keep the radix and 64K-specific details, drop the > duplicated 4K PUD arithmetic, and replace the repeated device-dax diagrams > with a single parameterized PMD/PUD diagram. > > Signed-off-by: Muchun Song > Acked-by: Qi Zheng > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David