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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-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , Precedence: list X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_PASS,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