From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 2D42C606A32C for ; Sat, 7 Nov 2026 17:41:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=HRsQH68f Received: by kanga.kvack.org (Postfix) id 3BD7A6B05B4; Sat, 7 Nov 2026 12:41:58 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 36E926B05B5; Sat, 7 Nov 2026 12:41:58 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 284FD6B05B6; Sat, 7 Nov 2026 12:41:58 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 0397B6B05B4 for ; Sat, 7 Nov 2026 12:41:57 -0500 (EST) Received: from smtpin01.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 951471201A6 for ; Sat, 7 Nov 2026 17:41:57 +0000 (UTC) X-FDA: 85409041074.01.6FF7DCE Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf17.hostedemail.com (Postfix) with ESMTP id E985340004 for ; Sat, 7 Nov 2026 17:41:55 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=HRsQH68f; spf=pass (imf17.hostedemail.com: domain of osalvador@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=osalvador@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1794073316; b=mf6FASCk7wca+GHBUr0SuKk4L5cdn4i6Pc0W1e/MZgjYcHGhfgnPvvITcDT7qUcGRwXuyC 7FCsR7xviiLP9fTomuwXKr2UYwWqzDLz5gFisIk4USLlLwoUZMEHD5NrGZ8KEIqlRMCaq9 HjTZvP8VMisdiaXinXHJLZYM/so919E= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=HRsQH68f; spf=pass (imf17.hostedemail.com: domain of osalvador@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=osalvador@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1794073316; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=2smR8h1VY8UC7VVz5oqEi+bHmSa6sUXSBdFSQ0jzot0=; b=J8jYR/bal4Yy07orXm41bDmMR3jr0Ii7hilXgDKoxVEYAado8ePlkM+8vjgMZiuzrf98hi vIgzPt0m2fGOMfeaFlvcXsngphVnHaPzESRVSuqMcRrwjQA/EscTpgs7opSW1UUKB5bSiS l2hhI+Lm6A+IvCqLm9+67iOWK91YnW0= 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-Stat-Signature: 9oigja1hytsojmfdttm7hiz9c7yckykp X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: E985340004 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=ham autolearn_force=no version=4.0.1 X-HE-Tag: 1794073315-15937 X-HE-Meta: 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 ALqDg6pF vayco8FsIW5DVqV5dCaMqPFU0K69RFezSFaJzTftQOLZbRxsxGtt0bzRfjXJKyOrpiBRwIJ63xxEsB1zOElJL1SX1Z332320ZWi0o6FiwLpNrOhqR2+viAgjJyWAYk4QEnRkEim+FbSVj3+PkcxuNSQK8C2Qv8GsP+ERiokxS8CnrSuzR1tFRXHuYaw3v/FB4raLk8ZSR4rGTPBh7I6zW9xUI4SHKMv4ddxHifxCUm4aEnvaY3X5mULXc8mXiOuw6DRn4JWxIcz1bK1He2WDuY7TgCCf1iSI6Cg+WdaqCgNqG0FskEdC2G9JV+km7L9uEEflE5n6QmOT2obLk2f5Zg+bvsszeo3Z9GJyuCVYE2YRPPYlhqQnvWr+Bvx6PWchvLGEi 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 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