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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id B32EDC36000 for ; Fri, 21 Mar 2025 10:49:40 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id AFE2D280002; Fri, 21 Mar 2025 06:49:39 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id AAE53280001; Fri, 21 Mar 2025 06:49:39 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 92745280002; Fri, 21 Mar 2025 06:49:39 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 763FC280001 for ; Fri, 21 Mar 2025 06:49:39 -0400 (EDT) Received: from smtpin18.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 6C3195A2B3 for ; Fri, 21 Mar 2025 10:49:39 +0000 (UTC) X-FDA: 83245237278.18.F764801 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf08.hostedemail.com (Postfix) with ESMTP id CBADB160013 for ; Fri, 21 Mar 2025 10:49:36 +0000 (UTC) Authentication-Results: imf08.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b="Q/kd01yn"; dmarc=pass (policy=quarantine) header.from=redhat.com; spf=pass (imf08.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1742554177; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=5HfBpke3YL7+rR7hRniNLyJc0aMTeAEo/zxk+Y3d0Tw=; b=Qy/jty9hnFUxHLNMMQd2p8qXheNrNzuOORls5h+cBtoYYKFGkcEGi5YrEdqdsGYxEO82RF g/YCe75XHzY4cVZ+BURJWrX+2Ve2cgTtj4yoIB8eO2ycdkduxc5hlkSkO73zrN1IV7Yuld vVwo8EgMiN01F9JCg0+L52xaBzXRkig= ARC-Authentication-Results: i=1; imf08.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b="Q/kd01yn"; dmarc=pass (policy=quarantine) header.from=redhat.com; spf=pass (imf08.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1742554177; a=rsa-sha256; cv=none; b=pwgsPr6Cy5L9EEe+NxEG2vPG8ONAPUFeQAojokLkanzBwdQJSR5j3bCqQXCAedwz5KwnjB pNmzXbQILBPRQT8/WaRLexB2oPRN+AzZZpy+PA8Ih42L1rf2QsGpZdbNOQv0IRa4vWZqDa Oz8eWIadqlBfJDbIoaAvJCf8E2Lj21c= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1742554176; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=5HfBpke3YL7+rR7hRniNLyJc0aMTeAEo/zxk+Y3d0Tw=; b=Q/kd01ynyaBLp69pRJMlnUyt+GGQ5OohQEKix2AKqq67PavDTZKnG0ZpFJ1tmcwUot+GKf aSZ2Hu0h0FbI+XtqJhqh+90oLJxbpYHOVAiDIbLxwS4WKx5i5H7JEM8LxvtFeD+cAlMald t5iJ9Q9W8mIMUcCgOXVkygxOD3cZYSs= Received: from mail-wr1-f70.google.com (mail-wr1-f70.google.com [209.85.221.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-606-v4OoFb9aNka4iH8OuXGpKA-1; Fri, 21 Mar 2025 06:49:35 -0400 X-MC-Unique: v4OoFb9aNka4iH8OuXGpKA-1 X-Mimecast-MFC-AGG-ID: v4OoFb9aNka4iH8OuXGpKA_1742554174 Received: by mail-wr1-f70.google.com with SMTP id ffacd0b85a97d-3913aaf1e32so1121388f8f.0 for ; Fri, 21 Mar 2025 03:49:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1742554174; x=1743158974; h=content-transfer-encoding:in-reply-to:organization:autocrypt :content-language:from:references:cc:to:subject:user-agent :mime-version:date:message-id:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to; bh=5HfBpke3YL7+rR7hRniNLyJc0aMTeAEo/zxk+Y3d0Tw=; b=jskxQ2ndV3Fo2kwU1YSHJqM94mjZDxnVZ7DSy+Cu9tru7gWRwrIiiQJSpOqEhseI6e Z9VDPvQGEyVg5GQP53QQt6Msgo+3oApqoojpJHreAbW8R406bg2YmyX5bnlr2Lsqra7y fgj1MLXz1VMYZC3kiO9ZwY/ztNVbuwcS+tH7+k+gS4AhK1f5n1LyMgmQuNVNwM5M3CbK qJRj6uf3D07zL9aAMD1CsDp5zRDihTlgSNpxwoMNNi81mD+rr0r2c/Hw6cBGP/gHsIIL Y2XCZ2Rtvo2w6/OB57q0tmI1oxkMEdRPeZjXXqnUafNHFTDKoaxiuRtKPuCTSGXTy4R4 F2jQ== X-Forwarded-Encrypted: i=1; AJvYcCWORfg9Wvav+kExo4iHAOj6FamwydXrDGH8PqMA9CznMiVt/iOYQ6zMa0zwDU06z+UeB1caYOnnOw==@kvack.org X-Gm-Message-State: AOJu0Yyj3DlyghCj/2nN7SAd4IcQcCYhYwYrzK72yR9zunuaiMcalM89 ZEpoFT8URcUIsIhHi7EaN6sWiSrFLnjJAa5sOncE1LCVYyRxNr+pT5XB8Oog635EUiVAAG6KIIl p+PcdbRlCIqiFzPiApqrl8T/G2HijaWiFAA3NB4rCzEY1yMGp7nWhFEsarLY= X-Gm-Gg: ASbGncuRPN29tV3m7i5nxrVWPTjvXqVe6ePYCMQJyIDQHQdc7yq9SL99TDwQ1LgVCKu h7ixgSynWDH9hkzzZcQvyQBvncBUcSa0NGiiC2hn+puyhmr7yHgLM4a3/GizCkihDY79PnW2q0P oNjVekxr24GTsGUJ/5Cg4lOtfyzGXKD74iJp036qMaKKMOLa4Y/BvRNpvYeR5x6EJHhWWgbXWkr 2uVgRdIT0qmza5VLLvchj7I45by3i3t6jM/mUfPnsrCcBWdUJahKLpAiHo7dQ0YfzC8gJAempYB E6sPKS3l9nCMXIGfMQYaqAKiofNponp+hhCZpPjunkYZgiyyKt7qYevm2MB0fV0aNcGTV/UC1FZ tbL97bSUKVmkVcRwjTaWOgQanbquRFrHqWDTtr5hnu84= X-Received: by 2002:a5d:64ce:0:b0:398:fd9b:b935 with SMTP id ffacd0b85a97d-3997f9407b6mr3202445f8f.53.1742554173620; Fri, 21 Mar 2025 03:49:33 -0700 (PDT) X-Google-Smtp-Source: AGHT+IE/QIYfFEThKYHfy0m4x52uirzkjphsVpeKs7ht6DTF54VIuM9rWUOyEUHCqESKQ+gfIZJrbA== X-Received: by 2002:a5d:64ce:0:b0:398:fd9b:b935 with SMTP id ffacd0b85a97d-3997f9407b6mr3202410f8f.53.1742554173184; Fri, 21 Mar 2025 03:49:33 -0700 (PDT) Received: from ?IPV6:2003:cb:c72a:9100:23d2:3800:cdcc:90f0? (p200300cbc72a910023d23800cdcc90f0.dip0.t-ipconnect.de. [2003:cb:c72a:9100:23d2:3800:cdcc:90f0]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3997f9f0107sm2060668f8f.99.2025.03.21.03.49.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 21 Mar 2025 03:49:32 -0700 (PDT) Message-ID: <43657a07-617b-43fe-b0b0-689f2392fc63@redhat.com> Date: Fri, 21 Mar 2025 11:49:31 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] fs/proc: extend the PAGEMAP_SCAN ioctl to report guard regions To: Andrei Vagin , Lorenzo Stoakes , Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, Shuah Khan , Jonathan Corbet , Andrei Vagin References: <20250320063903.2685882-1-avagin@google.com> <20250320063903.2685882-2-avagin@google.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: <20250320063903.2685882-2-avagin@google.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: SinVmP9_iX_Cpl2ybuTj1qJT0GCsCEeHsKycVHCo07o_1742554174 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam01 X-Stat-Signature: ztkc85uqsctrynpyrcwwcz65e6mhn7rd X-Rspam-User: X-Rspamd-Queue-Id: CBADB160013 X-HE-Tag: 1742554176-659429 X-HE-Meta: U2FsdGVkX18SCNqulrm41D3OuOpYbp1Uv4QkAfWLIFKF7ksqy/KU3F+bQAK6pf+PErHjIqgxIIVpaER9qnmFP9FEz3mqHgnUwwaxhWDd4GsYXCawPRjWtWHHo7esDvR33iHTttXDf3IVtkKA9LOxl4ZkcICec143Q9eTmKYaa74q1j8mHoak31gvyYoapEaRJ4/0MVjv3ntMmMhYBsZwd8bUmMBoY7mfyyvXbpw7+jBZ42qDDKrDWdVQMjQq1T/l/swHYjS5tuL8ASW7C6I2i4zn/n7XK0gaPbT7lAJCF068NYov37v5tkMkB+ZBVYEBrO4KA2/YJ4I+BCXJ8vgGV78Mti/YVDfpnioRwabpN2NZm7rTE7BhmzCnq2OjmG84YeXsJaOX5NnF5/T5dPvM9/KDlKDMxCG98NZPZmUFdS2gezRoM/J6bHB0hztbUzNHii7Q8PjR0Bqyt+y9zZcAYSq/+5DjZEXDn+IWF45JGhrvOmKNmzd4z1RAU49WOs2phnVzqs8JGusk/pU2C+QdFQtxj5DOh8d6ptuprxBYp69nWHEqJ4ney8VVHhU7Mb3M3GvH9IzwTGkl4UB1vMPR/WHP0z0jnA3WZ87KocR7ii4P1+dDZ32LknbKlGo3/4KqmvlC7Z+9QlVpU9ft+K07KbbGSXsbgUKAtH7EpGmA2Dzjvtcam+xvI6nVMuWpGPaUVrdNKdq2YWNDttglKCKoGLDXlw9cIjiHBNJEwcdYKNi6snjulyINn/gIaLlnKuiGjvLiq5sBaGgBOaMIWe5QeGalU2mAFz+chHNzPodiCHzyRmDjuJOr1ZLGKIcFCJGYrLtS8xeju+lFEss31j9E4f32Ld6OIxYB8T/jHJauh0Pjo0o4sZ+aNO3hi4xuljUalTrAFO/ysBDqaK0tt3CDtGZBLB6KyeVU6JZsH44cETarE4N8KB/nh/pt2rtUE6i1VqaZ4dA1Lb8jO4n6ZjN TxjbEUAf kkT8ijr0q46uiRhzBCwRDBRxSyTBb5PckeEUDpgAZrL7MwzrehIk8S/NXdfmtSqkb6nt0t85jH/cLxIklRZoS8BdUhMHuq/wWXv2eI9cICScctSYIo+v7QNoPU2aJMvLbnQFvrJW+9l9aMvueQKCzi4MDh0XVpJjA6fX9BYqmS5aQ2wlCvgoK72MpkyYYrPQ3dSKXtVKr/Lsy300ZpFkHi4U38fYws7Wh/gGrlu5v7ra7CEBP3SnjfM9P0O1Hmqx1+/WpHC8TYDOWPs4Gi+TfGeQkP3XVFMKpi5tUATLMDSfeLF5/c0ifEtKlT1Er9AGWnVIRaqx1A8OVIO+VjL2ua6vtNUueA8KMayxNBi7NTJ2dNNjpwXwp02GGKpa5nwsR2LdcCNITvkxKOTFojl1zKACfrFivzPXWYOovVMXCTc02kIkqvPsHTRxJ0Bn7n5qbKIXPbxw+nMM2bREVF6Cnk7HuzLAsawlo3XWn9ndvP9d33pdktwOTC4KkMsp1K33KHzsSFbL3z8QYbKae/OdO5+l//U6kLXAwhtLd X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 20.03.25 07:39, Andrei Vagin wrote: > From: Andrei Vagin > > Introduce the PAGE_IS_GUARD flag in the PAGEMAP_SCAN ioctl to expose > information about guard regions. This allows userspace tools, such as > CRIU, to detect and handle guard regions. > > Signed-off-by: Andrei Vagin > --- > Documentation/admin-guide/mm/pagemap.rst | 1 + > fs/proc/task_mmu.c | 8 ++++++-- > include/uapi/linux/fs.h | 1 + > 3 files changed, 8 insertions(+), 2 deletions(-) > > diff --git a/Documentation/admin-guide/mm/pagemap.rst b/Documentation/admin-guide/mm/pagemap.rst > index a297e824f990..7997b67ffc97 100644 > --- a/Documentation/admin-guide/mm/pagemap.rst > +++ b/Documentation/admin-guide/mm/pagemap.rst > @@ -234,6 +234,7 @@ Following flags about pages are currently supported: > - ``PAGE_IS_PFNZERO`` - Page has zero PFN > - ``PAGE_IS_HUGE`` - Page is PMD-mapped THP or Hugetlb backed > - ``PAGE_IS_SOFT_DIRTY`` - Page is soft-dirty > +- ``PAGE_IS_GUARD`` - Page is a guard region > > The ``struct pm_scan_arg`` is used as the argument of the IOCTL. > > diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c > index c17615e21a5d..698d660bfee4 100644 > --- a/fs/proc/task_mmu.c > +++ b/fs/proc/task_mmu.c > @@ -2067,7 +2067,8 @@ static int pagemap_release(struct inode *inode, struct file *file) > #define PM_SCAN_CATEGORIES (PAGE_IS_WPALLOWED | PAGE_IS_WRITTEN | \ > PAGE_IS_FILE | PAGE_IS_PRESENT | \ > PAGE_IS_SWAPPED | PAGE_IS_PFNZERO | \ > - PAGE_IS_HUGE | PAGE_IS_SOFT_DIRTY) > + PAGE_IS_HUGE | PAGE_IS_SOFT_DIRTY | \ > + PAGE_IS_GUARD) > #define PM_SCAN_FLAGS (PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC) > > struct pagemap_scan_private { > @@ -2108,8 +2109,11 @@ static unsigned long pagemap_page_category(struct pagemap_scan_private *p, > if (!pte_swp_uffd_wp_any(pte)) > categories |= PAGE_IS_WRITTEN; > > + swp = pte_to_swp_entry(pte); > + if (is_guard_swp_entry(swp)) > + categories |= PAGE_IS_GUARD; > + > if (p->masks_of_interest & PAGE_IS_FILE) { could be an else if? if (is_guard_swp_entry(swp)) { categories |= PAGE_IS_GUARD; } else if (p->masks_of_interest & PAGE_IS_FILE) { ... Acked-by: David Hildenbrand -- Cheers, David / dhildenb