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 0B6CE606D81A for ; Thu, 5 Nov 2026 16:07:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=Lqu3Ekh9; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=fYo5p/HM 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-Transfer-Encoding:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date: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=fYG2b96fyayScxVvqtx3OSAsQSRRGOB6T40PDUmTI+8=; b=Lqu3Ekh9eLnMw+rMYP3Kqn9XNA PcqTy08nqSkHtkyxEn/XT3rC7vHwWw9e6pY7LS/qUcNXM+398V0+YAgUK7ZTgNJieAKHwj2Ag8h9I Tt39tz1m3aIfu+GefhAprU59nXC0ArOE0/QEmQq65nobkiADNXF+rX/ZSIpVC0wAmMpoxUT6aNtOA PJYrgOdQgBULT2SrWW0fmIODdD6XhxcoOeIF3ZiqgpC6vPzW/cgTHrSdLhfRXKjyGT2ERuOF12Pdu I2RDCh8sVpGRIsNAEEOKpBnc2/9PSETlgXniDnqfnQZK2RuCl6+Q3tb/D/lY1/tapzh04qi2zv3e+ IdRsUNHQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xOzzk-00000009YBT-3fxs; Thu, 05 Nov 2026 16:07:20 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xOzzi-00000009YB2-457V for kexec@lists.infradead.org; Thu, 05 Nov 2026 16:07:20 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 44758602C3; Thu, 5 Nov 2026 16:07:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8E9871F00919; Thu, 5 Nov 2026 16:07:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793894838; bh=fYG2b96fyayScxVvqtx3OSAsQSRRGOB6T40PDUmTI+8=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=fYo5p/HMbU1gpXil/HFCks0XvJiGMwmcZT5vbnMwHLk29sKgRmtxnOzZk1wDd/aea 3QO93SZshqmi5XcbWCDImlOImNePvoMJSzaG2b7YVRdjnMMdkX2pMzX3zjGqqi9z/R 1giA01W0A74nBvUCV4Evs/Jpwh20TV7FcDEvOARPx86KpxOfYsGMq3+4ict6Zw0DmO s71kK6K/sdKfuvuYgcVNrK3Izbx/cjngYc8wS2qLay+oUhVI6HRfeV9UV4zP/v7cDI sRVdM/r2aEzpO9PIo3TiPHvl/20iU0QuIOji7FmhpavsI/vN/TSq8Nm8/IpxBsuWOM +wCOYw3XpsVoA== Date: Thu, 5 Nov 2026 18:07:07 +0200 From: Mike Rapoport To: Huacai Chen Cc: George Guo , pasha.tatashin@soleen.com, pratyush@kernel.org, ardb@kernel.org, shuah@kernel.org, ilias.apalodimas@linaro.org, akpm@linux-foundation.org, baoquan.he@linux.dev, ruirui.yang@linux.dev, guodongtai@kylinos.cn, kernel@xen0n.name, graf@amazon.com, liukexin@kylinos.cn, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-efi@vger.kernel.org Subject: Re: [PATCH v6 5/8] LoongArch: Allow memblock arrays to resize Message-ID: References: <20261029172956.20791-1-dongtai.guo@linux.dev> <20261029172956.20791-6-dongtai.guo@linux.dev> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" X-Spam-Status: No, score=-5.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no 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 Thu, Nov 05, 2026 at 11:07:01PM +0800, Huacai Chen wrote: > Hi, Mike, > > On Thu, Nov 5, 2026 at 8:57 PM Mike Rapoport wrote: > > > > On Fri, Oct 30, 2026 at 02:29:52AM +0900, George Guo wrote: > > > From: George Guo > > > > > > LoongArch never calls memblock_allow_resize(), so the reserved region > > > array cannot grow beyond INIT_MEMBLOCK_RESERVED_REGIONS entries > > > (INIT_MEMBLOCK_REGIONS + NR_CPUS). > > > > This might be something to fix independent of KHO. > > > > Huacai, > > > > What's the reason LoongArch never enables memblock resizing and why it > > defines INIT_MEMBLOCK_RESERVED_REGIONS to include NR_CPUS? > At first we didn't define INIT_MEMBLOCK_RESERVED_REGIONS, then we got > boot failures on a 128-cores machine, so define it, and the value is > similar to arm64. AFAIR, arm64 had to reserve some per cpu data before they could enable memblock resizing, so they had to make it static. > The reason LoongArch never enables memblock resizing is because the mm > code is derived from MIPS, and MIPS never enables it. If that's the only reason, you might want to revisit that :) > Huacai > > > > > -- > > Sincerely yours, > > Mike. -- Sincerely yours, Mike.