From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 671EE606A31C for ; Mon, 9 Nov 2026 04:27:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=XesrLE4/; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=u/Gx8aBg DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc: To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Unsubscribe-Post: List-Owner; bh=0SVPjoU02fufplg6UCU1lm8OR+hTiBw+cX99Xog7iH4=; b=XesrLE4/wAvZkP 0cmndHzVu03ko2Yi93t35XuBjay11XYcfHnfQhzsL/6+7eZ/xPlyaarIq5Y0ngULwrnFOjdoy9NfP iqCZoqZeUIbCl7uUyhmbDm7wpUfwjqx/KBe3vzy+EvQ91eXpWEgKtA+2Y8vjc9oRHzFd2mFHEoof1 5UpZ26I7ahN4OXacYsasdptq06grKkf9aGwXpqSg53pgooYztZcS7QDXXbfiwkwBmF4MAjzGZHqvQ VNDnb471tAiJc7zVWsOb0YaaRYhBMTMiBOsT27531hWhFJrgL46f54I7HxTSXJwXikMffXJ2a8sjB CXAAu9JDnycXUw1+WZoQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xQGyD-0000000HJ12-34Qm; Mon, 09 Nov 2026 04:27:01 +0000 Received: from out-24.mta1.migadu.com ([95.215.58.24] helo=mta1.migadu.com) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xQGyA-0000000HIyv-1oXW for linux-arm-kernel@lists.infradead.org; Mon, 09 Nov 2026 04:27:00 +0000 X-Envelope-To: linux-arm-kernel@lists.infradead.org DKIM-Signature: a=rsa-sha256; bh=0SVPjoU02fufplg6UCU1lm8OR+hTiBw+cX99Xog7iH4=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1794198415; v=1; x=1794803215; b=u/Gx8aBgnHUkuXVi2+BQTYcTDxH8zFUmAR/TVFAy46WVUw8Lm9l8nbKAhmANIRo5EFy9lMew uqhCIgOleT3njpCY3/Dv7cMDqi4bwx/iXr8FHzCyP+4xEO4rb2Uae+SFRzrmb+HNtjjXKcUWcSf Benz8ZX3QBGriDvnxTFBIbfA= X-Envelope-To: linux-arm-kernel@lists.infradead.org Received: by smtp.migadu.com with ESMTPS id b6a087d0e32380d8; Mon, 09 Nov 2026 04:26:54 +0000 X-Mizu-Trace-ID: b6a087d0e32380d8 X-Migadu-Flow: FLOW_OUT From: Lance Yang 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 Message-ID: <20261109042647.37323-1-lance.yang@linux.dev> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20261107043122.25650-3-songmuchun@bytedance.com> References: <20261107043122.25650-3-songmuchun@bytedance.com> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261108_202659_113708_04D13301 X-CRM114-Status: UNSURE ( 6.91 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -2.1 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-13.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 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 >--- LGTM, feel free to add: Reviewed-by: Lance Yang