From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta1.migadu.com (out-91.mta1.migadu.com [95.215.58.91]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BA72A51B19A for ; Thu, 1 Oct 2026 14:27:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.91 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790864850; cv=none; b=XMz0YCsIhsUVQR4Srgi4T55kXA4k5kjkigUnYdYg3GfFBNgrxmAKOaxwsh4tfa3X8CJeRhL6uqN4fAc/coFp6rAtmHiEMvlNqt01OOpKe2XpFCXv3z3dDhzlumQDawSs7FEjRrQSi+IaCZlJvIt2NG98XLnievn42GpqqbHckTg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790864850; c=relaxed/simple; bh=LJMXlOX6G72KgzwR6NBXyCt54iCm9KoR+tZW/E7WXfU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=a+f6kB+iZ7XiCC6uL3he+1ErYUQqLQb/oRPxSn0bqePhCQIR3MnyfRVAGPaXTUwOcusZkKHGxz0C99R+9seIJ8Gg6hysZKo8jJlSGUPnJCVfJSYAB1VBoZYn8G0wekztrm6v9t2Rsi7Ykk7EJJXngZ7w5KhvLntOh5j4F7QjdZA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=LVTy4xtf; arc=none smtp.client-ip=95.215.58.91 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="LVTy4xtf" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=LJMXlOX6G72KgzwR6NBXyCt54iCm9KoR+tZW/E7WXfU=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1790864841; v=1; x=1791469641; b=LVTy4xtfopRyUlAYWDLVtKCMj+4EgWXO1nQ0fG46RqRJUjp7fIqMLXmqhthN8jMJf1/v7612 u9rC6eAzFrlpDUf1pKXbolfDhx9//AQxU/kwLWzht8cVvDU7g1MdZm+gCxheL1w846vXQGwKpW2 4KX1fUZwDb+3jUNdDVZ1rTH4= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 37d698b651d6e08d; Thu, 01 Oct 2026 14:27:21 +0000 X-Mizu-Trace-ID: 37d698b651d6e08d X-Migadu-Flow: FLOW_OUT From: Lance Yang To: songmuchun@bytedance.com Cc: maddy@linux.ibm.com, rppt@kernel.org, akpm@linux-foundation.org, david@kernel.org, mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, ritesh.list@gmail.com, sshegde@linux.ibm.com, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, surenb@google.com, mhocko@suse.com, qi.zheng@linux.dev, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, muchun.song@linux.dev, Lance Yang Subject: Re: [PATCH v3 3/6] mm/sparse-vmemmap: drop Device DAX-specific population path Date: Thu, 1 Oct 2026 22:27:14 +0800 Message-ID: <20261001142714.17172-1-lance.yang@linux.dev> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20260929053231.66085-4-songmuchun@bytedance.com> References: <20260929053231.66085-4-songmuchun@bytedance.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On Tue, Sep 29, 2026 at 01:32:28PM +0800, Muchun Song 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. > >Signed-off-by: Muchun Song >Acked-by: Qi Zheng >--- LGTM! Feel free to add: Reviewed-by: Lance Yang