From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B0E03391846; Thu, 6 Aug 2026 13:21:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786022463; cv=none; b=ljsd/fp86I9JCCkoH0hB/Mz6q/RUDn5igSP/Qg+tiWqdmry29ka+YUsnZtj2I1eJ74a0hb+NlwDsSORfzFBk9TdOag3yJbEquxG3oFVgozqNo/8q4gs6QG+GABcOD/8Hk7Fy4dKyGRkgdOfMv6bBU2znR8gb5iOt47Z+YhFHKG4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786022463; c=relaxed/simple; bh=irH9jqie16B9536/cnyvLdNZFFUpvNYEmeCXEB41/S4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=CmR1U05PZ/zPap8uGLnd1NokVsarc6K82kK5K00ZgPxnBoP4yFyhUHbHFk6kOjIvWyVcXrxw7D//7kGio5m876fVHtWGkG8rR52x59HVPdZiJp4CayTwdzx3/X++TTyv2Em8x1r5hC79Jgjb7U3O9uRNaubjQvg8Fm5wdCJZw0U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hAv/gKVT; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="hAv/gKVT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CC3E01F00A3A; Thu, 6 Aug 2026 13:20:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786022458; bh=9M22hpR37Fywe1zZz1y9yAYVc4M0MHck+1iq8vIWd3Y=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=hAv/gKVTNnWOwNy0eCGclNrpJrUejSmX/wq5ebyMntr2wjyTpm5EUABDroL8KrD41 p6/V1ny8qs3CeeMRlvgOFd5/btgg2ICqTVgg8NvHRe6cQwnMw/74Ww6uG1AxOa68XW mfw/FK5BTxZCdpeMvXONqZ3mT6ELG/HbiVhMVh5JfgLSF740EtEs0eEKdMsc90UKd+ HcM5kYWuGmYeEqWBDPik6P76THWeMTlfV1MLZFaGhUTVorjPkH0fOiFdIcm9DawxVH XZlCZyRYyCZzpjwrAi6QX47WdGy5fZRaXw/P2psZK2LXBsjaIN+ww1zP3lXMFrZssq NjA4IxsryEcrw== Message-ID: Date: Thu, 6 Aug 2026 15:20:48 +0200 Precedence: bulk X-Mailing-List: damon@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/4] mm/huge_memory: skip zone device folios in madvise_free_huge_pmd() To: Gregory Price , linux-mm@kvack.org Cc: damon@lists.linux.dev, linux-kernel@vger.kernel.org, kernel-team@meta.com, sj@kernel.org, akpm@linux-foundation.org, ljs@kernel.org, ziy@nvidia.com, baolin.wang@linux.alibaba.com, liam@infradead.org, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, usama.arif@linux.dev, vbabka@kernel.org, jannh@google.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, ying.huang@linux.alibaba.com, apopple@nvidia.com, stable@vger.kernel.org References: <20260728194714.3713735-1-gourry@gourry.net> <20260728194714.3713735-3-gourry@gourry.net> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 7/28/26 21:47, Gregory Price wrote: > madvise_free_huge_pmd() resolves the folio backing a PMD via pmd_folio() > and marks it lazyfree without checking for zone device memory. > > The surrounding guards do not cover every zone device case: > - MADV_FREE only operates on anonymous VMAs (DAX mappings are excluded) > > - !pmd_present() branch rejects device-private and migration entries > > - present zone device PMD (device coherent THP) is not filtered. > Unlike vm_normal_page_pmd(), it performs no special/pfnmap check, > and would be marked lazyfree here. > > Bail out when the folio is a zone device folio. > > Fixes: 368076f52ebe ("mm/huge_memory: add device-private THP support to PMD operations") > Cc: > Signed-off-by: Gregory Price (Meta) > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David