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 73F83CA9ED1 for ; Mon, 12 Oct 2026 13:29:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=BJWJfJvFdRXU7A7CP8bKUhf5LvjKVS564TTBwWUrmqw=; b=DdstI2uMozt4c6wJstLRUO04z6 HkMv7RM6+RoczcrfU5f2ZErRwwKzelsHuZ9wE1NxL76Lfcad60iU7jfqY76ChwWFklUUivhTgoMkm 1JiQ6iSi5j6FHcqCcSITVgeKfmEzOuKPaFtoML0u0p/cH3O50rQh7+00LONSznRP25bHrtxKba2ns jUf0CFLH947JhjMyBGRVMiGL06lwYPy3XfWDxkIHD5tMHPBMxvuiDnNs0i582WhteNM2Mq1v1tH1z rh+Qq4DtNKJuCY9rI3TyzCGHcuaBlH7rhbGrCoAFBBmhqppmHZuChW6z4jJpZOGNVd5suYu5YIphk AJ5YS0hg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xGG5M-0000000AZJA-3nT9; Mon, 12 Oct 2026 13:29:00 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xGG5J-0000000AZIi-3Kyu; Mon, 12 Oct 2026 13:28:57 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 0EB1A60AA2; Mon, 12 Oct 2026 13:28:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 693491F0089C; Mon, 12 Oct 2026 13:28:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791811736; bh=BJWJfJvFdRXU7A7CP8bKUhf5LvjKVS564TTBwWUrmqw=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=EC+clTKQWYqPlYBodlVrok9It43/JtduTxKf6oq0WBqsXaEE/fWQ/aLbyuEOxBEBC aj8VV62n48eANgEswgmLe+sz7d3kelzv7I1i9px8FE7JF6AnYtWr2e6QYjbXYTykrD jmHx2nQTevuvQ2BHkjXO4V1TkXJmRZ3fM2oDk5HgpA0u95NXQ5jRnIg30lLZuxf63L LNvVQWM1SN0RxxdCmS2ZYeiECdObn8P2scSsoxqgsYXgnwtoHyEN8DSL5tmogGXL29 PzDDBbn5fGwNRKsY8z0fNjE+OcHXLHepynF1hcpPn8nDR33NkOBgSv72w+94GIr6ZC 26j7dSBXEYR1w== Message-ID: <01371835-cbc6-43f1-9d42-d22bec4ba0c2@kernel.org> Date: Mon, 12 Oct 2026 15:28:50 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/4] riscv/mm: fix hotplug page-table destructor handling To: Muchun Song , Andrew Morton Cc: Oscar Salvador , Dave Hansen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= , Catalin Marinas , Will Deacon , Mark Rutland , Kevin Brodsky , Alexander Gordeev , Alistair Popple , linux-mm@kvack.org, linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Muchun Song References: <20261010112457.49485-1-songmuchun@bytedance.com> <20261010112457.49485-3-songmuchun@bytedance.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 10/10/26 13:24, Muchun Song wrote: > RISC-V uses the same memory-hotplug teardown code for linear-map and > vmemmap page tables. Late linear-map allocations run page-table > constructors, while vmemmap and early allocations may not. > > free_pte_table() unconditionally calls pagetable_dtor(), corrupting > NR_PAGETABLE accounting for constructor-free tables. free_pmd_table() > avoids that for vmemmap using is_vmemmap, but mapping type is not a > reliable proxy for constructor state. In particular, it becomes invalid > once runtime vmemmap tables use the normal pgalloc helpers. > > Introduce free_pgtable_page() to select free_reserved_page() for reserved > pages and pagetable_free() otherwise. The latter runs the destructor only > when PageTable() is set, handling both constructor-backed and > constructor-free tables. > > Fixes: c75a74f4ba19 ("riscv: mm: Add memory hotplugging support") > Cc: stable@vger.kernel.org > Assisted-by: LLM > Signed-off-by: Muchun Song > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David