From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 D2ABE282F39 for ; Wed, 13 May 2026 13:35:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778679345; cv=none; b=GeRZeDfpGsejVPw8zf5SiRxXof+S8j8X5KXytFSUP0VznRs2VZmJRBu+VFCha34/6nDlDbjVaHeH9vE/1BlNHOtXKEZ6m46DR1ksWfNLMEuQcdEaErt8mr/g6DYkYutYauF5JfoKLHCbXjOLpdT7uFtL2CZIvS7wm+yhmbUVhQc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778679345; c=relaxed/simple; bh=VtibxkhAYfjTjmUQni6DJQNPb6ZonwoBGD5gIYn7P5k=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=EAlKqgBel9w57ry/DjQxyN7YRQ76AwjpgSLsM1KvSCgGqcjthDMU/9TC5zNZy7NbwunnkwnfQe/ci9meXIyizQ0DPtOU6u2HzjmtnWT5Xg4lczNeJ7OaCxstGJuLXcCX5U5MYtSoMlVrMBiuVYdDzf4zhMV33ksiUldL7jKtx/w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=P1c9Bnbd; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="P1c9Bnbd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6301DC2BCB7; Wed, 13 May 2026 13:35:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778679345; bh=VtibxkhAYfjTjmUQni6DJQNPb6ZonwoBGD5gIYn7P5k=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=P1c9BnbdUcMsBbyNwjr2lvTU6WorSiYjgcyy0QB/M9SvBpbxpZ4biiikBKfsbUII8 wsdTGk3FkdYqh8Z/EpR6Ckc3Gmtoof3FhM35aYYkv1oPKt8kg8cjWA9lefG57GUyMV 0nwDrzZaZcFTcNH/b/BeXaP480QjPSkMxd61Uc5Ug25Dg8EbdvPE0ixQ31xrXXbne/ e608amTjfQm7IK6K/tP+QW+wMBaJALYGjcy5d04hVThmXyPKW7zEqB4zi57IXGjDQL vTkRZBtkr0G7jaB4MG6cJn7Wd7uc9HxrAGkc5+XQQDbYV1mFrTuLdlgDgpsIcrS4gZ RECdqa6IYG0ow== Message-ID: <7d859ff8-a2d6-4c3c-9326-2cda7689329a@kernel.org> Date: Wed, 13 May 2026 15:35:36 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 03/13] fs/proc: use softleaf_has_pfn() in pagemap PMD walker To: Usama Arif , Andrew Morton , chrisl@kernel.org, kasong@tencent.com, ljs@kernel.org, ziy@nvidia.com Cc: bhe@redhat.com, willy@infradead.org, youngjun.park@lge.com, hannes@cmpxchg.org, riel@surriel.com, shakeel.butt@linux.dev, alex@ghiti.fr, kas@kernel.org, baohua@kernel.org, dev.jain@arm.com, baolin.wang@linux.alibaba.com, npache@redhat.com, Liam.Howlett@oracle.com, ryan.roberts@arm.com, Vlastimil Babka , lance.yang@linux.dev, linux-kernel@vger.kernel.org, nphamcs@gmail.com, shikemeng@huaweicloud.com, kernel-team@meta.com References: <20260427100553.2754667-1-usama.arif@linux.dev> <20260427100553.2754667-4-usama.arif@linux.dev> 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 4/27/26 12:01, Usama Arif wrote: > pagemap_pmd_range_thp() assumes that every non-present PMD is a > migration entry and unconditionally calls softleaf_to_page(). This > will crash on any non-present PMD type that does not encode a PFN, > such as the upcoming PMD-level swap entries. > > Guard the page lookup with softleaf_has_pfn(), matching how > pte_to_pagemap_entry() already handles non-present PTEs. > > Signed-off-by: Usama Arif > --- Yes, just like pte_to_pagemap_entry() does Acked-by: David Hildenbrand (Arm) -- Cheers, David