From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 93443C982EA for ; Wed, 23 Sep 2026 08:43:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=NPPdO6Zn4G26vQkQ/PQvK/YaxbOBRm3J0szMiQSU5h8=; b=2xOl5/8wi/f7Yr oaoPdjRCJ6thU9BnLVAyPRLE/AXzn2mv8jzSWxwr4Ifv+PBd9EZIOwjOv+vAvqv1HCUB5bckbP2O8 PZDqfpxeBBJOJXwUgped/Hebm8IbJanBHlc9N2Af4WrQpaMwQBb/bQqaZGiud2fCiHGXoj7MKh1Jm 8ptu+PkVpcS8tYSJXdojYL/8XPxoFZwUhA6eN/0Yn4oFrJwVgxYeRH20bDG1i/HepZ++s9mCHVwGx w+O7n8JEQfBO4iaMr8SuI5OlfsMk81Bi9FT9KxyPGHzeCMj1a5Ni6f7pI+5TFmWtwGqKv4jV8lylx NoHXNGh0iiHsi7FqxcWA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x9IZc-00000007Ze6-0oB9; Wed, 23 Sep 2026 08:43:28 +0000 Received: from out-199.mta0.migadu.com ([2001:41d0:1004:224b::c7] helo=mta0.migadu.com) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x9IZZ-00000007Zby-2RjQ for linux-snps-arc@lists.infradead.org; Wed, 23 Sep 2026 08:43:26 +0000 X-Envelope-To: linux-snps-arc@lists.infradead.org DKIM-Signature: a=rsa-sha256; bh=99+UKhu23KDHlR6Muc20Ly3uTrswjM+UPnqZD8Rdr68=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1790153003; v=1; x=1790757803; b=OVP+8UHSXLmBCK3c+dzOsk2DTtkt4PvGjy/FBMe5tjP12SMncYBRGF1bbqf2+ARWr1hychQU NrzV+WiUfQ6UfrkihqhxAO6bDiXp8t8/0WRzFKxAvF4kRdyC9MStYUxj3K2S/x8L2D4yF1YcD8I 1h5GTjgf1ieTc55NlgCiqJAY= X-Envelope-To: linux-snps-arc@lists.infradead.org Received: by smtp.migadu.com with ESMTPS id c8a1201785675537; Wed, 23 Sep 2026 08:43:18 +0000 X-Mizu-Trace-ID: c8a1201785675537 X-Migadu-Flow: FLOW_OUT From: Lance Yang To: ljs@kernel.org Cc: akpm@linux-foundation.org, david@kernel.org, ziy@nvidia.com, baolin.wang@linux.alibaba.com, liam@infradead.org, nico.pache@linux.dev, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, usama.arif@linux.dev, kas@kernel.org, guoren@kernel.org, bcain@kernel.org, geert@linux-m68k.org, dinguyen@kernel.org, schuster.simon@siemens-energy.com, jonas@southpole.se, stefan.kristiansson@saunalahti.fi, shorne@gmail.com, dalias@libc.org, glaubitz@physik.fu-berlin.de, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, linux@armlinux.org.uk, vgupta@kernel.org, monstr@monstr.eu, chris@zankel.net, jcmvbkbc@gmail.com, will@kernel.org, aneesh.kumar@kernel.org, npiggin@gmail.com, peterz@infradead.org, davem@davemloft.net, andreas@gaisler.com, richard.henderson@linaro.org, mattst88@gmail.com, linmag7@gmail.com, catalin.marinas@arm.com, mark.rutland@arm.com, chenhuacai@kernel.org, kernel@xen0n.name, tsbogend@alpha.franken.de, James.Bottomley@HansenPartnership.com, deller@gmx.de, maddy@linux.ibm.com, mpe@ellerman.id.au, chleroy@kernel.org, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, richard@nod.at, anton.ivanov@cambridgegreys.com, johannes@sipsolutions.net, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, arnd@arndb.de, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, jgg@ziepe.ca, jhubbard@nvidia.com, peterx@redhat.com, ysato@users.sourceforge.jp, shakeel.butt@linux.dev, corbet@lwn.net, rdunlap@infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-openrisc@vger.kernel.org, linux-sh@vger.kernel.org, linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-snps-arc@lists.infradead.org, linux-arch@vger.kernel.org, sparclinux@vger.kernel.org, linux-alpha@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-um@lists.infradead.org, hughd@google.com, qi.zheng@linux.dev, linux-doc@vger.kernel.org Subject: Re: [PATCH v4 05/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for arc, microblaze, xtensa Date: Wed, 23 Sep 2026 16:43:11 +0800 Message-ID: <20260923084311.15570-1-lance.yang@linux.dev> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20260922-rcu-pagetable-freeing-v4-5-fe1ad1f1e303@kernel.org> References: <20260922-rcu-pagetable-freeing-v4-5-fe1ad1f1e303@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260923_014325_822302_DEA53CB9 X-CRM114-Status: UNSURE ( 7.09 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+linux-snps-arc=archiver.kernel.org@lists.infradead.org On Tue, Sep 22, 2026 at 04:35:36PM +0100, Lorenzo Stoakes (ARM) wrote: >Each of these architectures directly free page tables without routing these >changes through tlb_remove_ptdesc(). > >The use of tlb_remove_ptdesc() is required for >CONFIG_MMU_GATHER_RCU_TABLE_FREE to correctly free page tables under RCU, >so simply update these architectures to use these functions. > >Since none of the architectures share page tables or do anything unusual, >nothing complicated is required here. > >Therefore this is simply a mechanical change - convert __pud_free_tlb(), >__pmd_free_tlb() and __pte_free_tlb() to use tlb_remove_ptdesc() as >required. > >At the point this is in place, all mmu_gather page table freeing is >performed under RCU, and thus MMU_GATHER_RCU_TABLE_FREE is selected for >each architecture. > >Note that CONFIG_MMU_GATHER_RCU_TABLE_FREE is dependent on CONFIG_MMU for >xtensa to reflect the fact that nommu does not implement page table >gathering. > >This forms part of an overall effort to switch every architecture to this >mode. > >Acked-by: Kiryl Shutsemau (Meta) >Signed-off-by: Lorenzo Stoakes (ARM) >--- Right, the old frees already end up in pagetable_dtor_free(). With tlb_remove_ptdesc(), the same cleanup happens after an RCU grace period. Makes sense to me, feel free to add: Acked-by: Lance Yang _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc