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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-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=us-ascii Content-Disposition: inline In-Reply-To: <20261107043122.25650-3-songmuchun@bytedance.com> X-Spam-Status: No, score=-10.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_PASS,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