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 5BF27606A326 for ; Sat, 7 Nov 2026 17:42:10 +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=oSHZ0hTY; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=HRsQH68f 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:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Unsubscribe-Post:List-Owner; bh=2smR8h1VY8UC7VVz5oqEi+bHmSa6sUXSBdFSQ0jzot0=; b=oSHZ0hTYZbTa64QPgoXHqzfmqQ AkWtHrS15zZEIX+uXztxBwB8gBMuxhLcziZD2z7zpQEZru6rXowExd34t+SALnlRZ2inEXHBLz1/d LjXDMAtvSt/xcHNLI9vGQDZhiciVWVuUxD/4QJ7RnjqS+KUcvSGxVMaQr/ZaEwrRYdlGXUW0sHLz1 E5BlSoC+/nQCuJmXfdH/6+WRaYcC6SWP1ZBkRYmkiiPSsBF+rIwt/3gPbHU8rbu53Hp5r7Y58VqTf d72pZYYOYm82GcdKATovTt0uYAwxJL7SgzjpqWV10SPYb0yizzl+LYbwThVn6kmKfnQyFx/4o3LWP apZJiNoA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xPkQO-0000000F70r-3ghl; Sat, 07 Nov 2026 17:41:56 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xPkQN-0000000F70J-3Iyw; Sat, 07 Nov 2026 17:41:55 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 27E4640086; Sat, 7 Nov 2026 17:41:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A19951F0089F; Sat, 7 Nov 2026 17:41:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794073315; bh=2smR8h1VY8UC7VVz5oqEi+bHmSa6sUXSBdFSQ0jzot0=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=HRsQH68fYsmt/YqRKnGb7j9+ZUn/BT15BJaZIFXTUVXUP3ixFLBWVgTbJU6W8sJpS b1fCpxzQFDVR2VJSr2R8zzA4uJoZdaIK0pmjvTM5lACaj4AJ7F874TXs2E62xNfRn9 L5SR2J84VJFqjLNK97AGzyBA0Ut29SeanbpUSwqtHzIqfGJ1wHFQCwrSmOOG0/hr64 1IfxE5CLwKht2cP+gI6KyqwZ4xjSA0Mx4E7dLsA3LP5pk3KX25TULgFopV3s/ukW5u KabHjycL3hyF/UFtHzldk64LubWRNFGj7GoutJ/5UALUefJc+nTjsr7J1+bPnfoGCg 7ItmzA7G+8f3A== Date: Sat, 7 Nov 2026 18:41:46 +0100 From: "Oscar Salvador (SUSE)" To: Muchun Song Cc: David Hildenbrand , Madhavan Srinivasan , Mike Rapoport , Andrew Morton , Lance Yang , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Ritesh Harjani , Shrikanth Hegde , Oscar Salvador , Qi Zheng , Muchun Song , Huacai Chen , WANG Xuerui , 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() Message-ID: References: <20261107043122.25650-1-songmuchun@bytedance.com> <20261107043122.25650-3-songmuchun@bytedance.com> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261107043122.25650-3-songmuchun@bytedance.com> 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=-10.9 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 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 Reviewed-by: Oscar Salvador (SUSE) I was about to complain why you do not go ahead and drop vmemmap_can_optimize but then I saw patch#4 :-) -- Oscar Salvador SUSE Labs