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 DACA1CA9EBB for ; Fri, 9 Oct 2026 20:38:42 +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=y/LFL9/taYy2cwYsCSPk5V+auF0O2Bb7JZnwWhgA5BM=; b=TbNsbKyGnyVXarYImzz0gX5MbZ FTnXxD7ZV5bU1syQ6PO3bbtIYPXi7G7c6fJslLRaIvMv3Hrzf3QdX3mQKDyXK7X26W492MP7L4mwQ iIiLuh1d+JyRMNSCKjljkE04wxV9+ZxQqSvvbFUvOPH4mwqcmhBJhpWO81xrWxFxtT+mH5JHxYhv0 7qq0fo3ota9IsTAzhfFtzfptgJyXkqG555lDxIE6+OJ+sX3s3AJfAzw2mNrWAqtH4VYxlhOYpRDca 0ePmGQuoD0HK8llIsHyr9tykJAEZHJ6YEkRa9VgIXdva9BTZvFwFuUBGKKF7w3nMVbIfaqMkoEvD4 iM7mWgVA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xFHMR-00000007BLC-2AIV; Fri, 09 Oct 2026 20:38:35 +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 1xFHMP-00000007BKk-46Ua; Fri, 09 Oct 2026 20:38:34 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 68D6960200; Fri, 9 Oct 2026 20:38:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 75BA71F000FF; Fri, 9 Oct 2026 20:38:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791578313; bh=y/LFL9/taYy2cwYsCSPk5V+auF0O2Bb7JZnwWhgA5BM=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=SvqHjuD7DSfowHNh97rZu6v7FwWPLex9GA7soWzWsQyNKB3v+LPC7fwAAR3ezbMLl erYo4mOcocXZC5ZmtfEJaN41zkSVTFR4PlQmnVVNWNDFcMC12BAsjhJYonIvVvu14L VlwHac6QlAjyMbDCg31XU03b5H1B/dLLPYc1U+rhhQL/sRyHgK//6KHAmxvyEgyZGm 2h5t1E1zdqHKyBlZJSr3+zRABa6ESRxS+W2CUpWtixr9tF3hZ5jrpm2HsUWTamEqBu 3yusekEt9FrzHkzQMrrH/q100cNJnk9dmxr/9cVSMVjwqE/VO9+dJS/7jbQQhpfhmu myCIGW/rN3tkA== Message-ID: <32191a71-b5b1-4913-a631-968ec299b125@kernel.org> Date: Fri, 9 Oct 2026 22:38:22 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/4] riscv/mm: fix missing destructor for hotplug PUD tables To: Muchun Song , akpm@linux-foundation.org Cc: linux-mm@kvack.org, stable@vger.kernel.org, osalvador@suse.de, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, linux-arm-kernel@lists.infradead.org, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, linux-riscv@lists.infradead.org, agordeev@linux.ibm.com, kevin.brodsky@arm.com, bjorn@rivosinc.com, apopple@nvidia.com, linux-kernel@vger.kernel.org, muchun.song@linux.dev References: <20261008073021.2512665-1-songmuchun@bytedance.com> <20261008073021.2512665-4-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 10/8/26 09:30, Muchun Song wrote: > Commit 8472cc4503eb ("riscv: mm: call PUD/P4D ctor in special kernel > pgtable alloc") made alloc_pud_late() run the PUD page-table constructor. > However, free_pud_table() still frees non-reserved PUD tables directly > without decrementing NR_PAGETABLE. > > Free PUD tables through the common free_pagetable() helper so that > constructor-backed tables run the matching destructor before being > freed. > > Fixes: 8472cc4503eb ("riscv: mm: call PUD/P4D ctor in special kernel pgtable alloc") > Cc: stable@vger.kernel.org > Assisted-by: LLM > Signed-off-by: Muchun Song > --- > arch/riscv/mm/init.c | 5 +---- > 1 file changed, 1 insertion(+), 4 deletions(-) > > diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c > index 429a0b015ec1..62077539ee78 100644 > --- a/arch/riscv/mm/init.c > +++ b/arch/riscv/mm/init.c > @@ -1540,10 +1540,7 @@ static void __meminit free_pud_table(pud_t *pud_start, p4d_t *p4d) > return; > } > > - if (PageReserved(page)) > - free_reserved_page(page); > - else > - __free_pages(page, 0); > + free_pagetable(page); > p4d_clear(p4d); > } > Routing this through a single helper looks correct. Acked-by: David Hildenbrand (Arm) -- Cheers, David