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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-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: BC487180007 X-Stat-Signature: sxh73an3c6pjxn3oyinojqn7dokxicd8 X-Rspam-User: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS autolearn=no autolearn_force=no version=4.0.1 X-HE-Tag: 1793894838-971002 X-HE-Meta: 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 GH22q1lD Jp+fyLyV/W1NYqwF1lITlefaVoEwZnn7I2bYh2hCNIj2zTk1HZBG/Zc3oYvUFC7rjo5jbUJpyjd+rteinX38fvrEHFs0GYoaRgIVhQV0TlC/38d6KM6cFBsxtBUjYM+cYV4sENm10U3lf3kCyJc8jtl0BrKKLv3Gps9zPv9ab5QNuAWsfi5SKRppuucBnkNmlTC0coxMHUjdHdMzam7FABvqPWpbsf7gz/jkWrwvJY17xoap2t9Ka7Sp4DDZoIT3EjgxV0ggYJzucmkP4J3a4gZPhF2d8kdwCe/bC5oZzaLIiOs4= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: 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.