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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DE4FDC98318 for ; Thu, 24 Sep 2026 18:51:32 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id DE0BE6B0088; Thu, 24 Sep 2026 14:51:31 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id DB8506B00A7; Thu, 24 Sep 2026 14:51:31 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CCEC46B00A9; Thu, 24 Sep 2026 14:51:31 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id A4A126B0088 for ; Thu, 24 Sep 2026 14:51:31 -0400 (EDT) Received: from smtpin18.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 35E8CA6833 for ; Thu, 24 Sep 2026 18:51:31 +0000 (UTC) X-FDA: 85249549182.18.8B9ADF6 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf12.hostedemail.com (Postfix) with ESMTP id 75C5740003 for ; Thu, 24 Sep 2026 18:51:29 +0000 (UTC) Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=B9TaPuWg; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf12.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1790275889; 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=19lgN71Gpsx5vFX/9xhZyr5Tn9Zwnud+YgNQwdRHAz0=; b=KAlRCjZn9uvMW7ReYQsWImFAt3mrh6lIEXYCieo8IeOaqmqALgvNzN3CoYisnveXKeUrNG +Fb7WuhtfaDGWIzc9KVj7JmPK6mGrh3dHzIPOPXI3rhO20pqAYgfLovy2a8JCpitZBX+CQ hBj4NisiGmrdOaskSAvJ+1ocnLRxJSE= ARC-Authentication-Results: i=1; imf12.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=B9TaPuWg; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf12.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1790275889; b=Bphgk3+EU3b13JKHqecM48O1S9maoX1LHCc9SXNU60/bXcD9PmfbZaDssz2MG8VZ4e0uYc jwEcg9+Uko6XWUbzeMRjgoySHj24hsY5iYkzKJHxnW7BqFi0MdPyNeTjcdeLD23ElIj9nK SiAf7yv8XSpQIsPpKyS+iGbuqghKHa4= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id DE605600D4; Thu, 24 Sep 2026 18:51:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AA4B71F000FF; Thu, 24 Sep 2026 18:51:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790275888; bh=19lgN71Gpsx5vFX/9xhZyr5Tn9Zwnud+YgNQwdRHAz0=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=B9TaPuWgeX2V6EXNOynhKmYXxpgBuhF0GO9GvEleV73ppMJ+4jg0gfKTK508nINu0 y5E68P/eS0N1Nf2rY9y/C35ESNH3DuJHHqCrktyZKsEz142m40zL+RvZubdy2Bbj6N B0gGhz7zq8YO1mV19YDxCBqcO/vi5mSTd8odzb0MeZcOcB11UVJJtzGXMG2x4uJaSx J6Es0Ej/BiLSmH0sepF5PDeoQzTg3lpupc7vbO24JxIqjpYE92LknGL0hQWuXIc+2N lQWjUiD9QO4+Z4unk5ZVWj6SNX/rkJMzJgTrpEerfy+R/pvx/8bE5MjCg6M/22H1aH pbA958pAZJ98w== Message-ID: Date: Thu, 24 Sep 2026 20:49:13 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/5] hibernation, KFENCE: explicitly map/unmap KFENCE pages To: Mike Rapoport Cc: Andrew Morton , Alexander Potapenko , Marco Elver , "Rafael J. Wysocki" , Dmitry Vyukov , Len Brown , Pavel Machek , kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-pm@vger.kernel.org References: <20260917-hibernation-v1-0-7f7dfae3dbe0@kernel.org> <20260917-hibernation-v1-4-7f7dfae3dbe0@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 75C5740003 X-Rspam-User: X-Rspamd-Server: rspam07 X-Stat-Signature: okhsyn9k9a6474wor5sjozuwoan9znb9 X-HE-Tag: 1790275889-187791 X-HE-Meta: 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 cnrwXmqN iLNg7QYEmVHtL56CEPXKiplLv18jLPgvVHD4+oNVET5NsoiBCjqYoiU8KK++cqJkQ7EOMGe14gyhizwPXdMMkXlhHlbFcshkrIx6kqHDME5Vn4x85z2yZY+w2MKIXpbx/a0mEpxVTE64htXo6k63/UOzLAd92HQtjYNwoQmgtYKMMdihdvv+XhYFRg7GLF8vzsxoq24uyO98fKeWSW0n7herSNlZpKDe9AVWnsnp2wBJm49UWvYEKUIbC4qozU0t623D2 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/24/26 18:02, Mike Rapoport wrote: > On Thu, Sep 24, 2026 at 10:19:33AM +0200, David Hildenbrand (Arm) wrote: >> On 9/23/26 17:49, Mike Rapoport wrote: >>> >>> Naming is hard :-D >>> >>> I feel that _copy_page() is to vague and adding hibernation there is to >>> mouthful :( >> >> Yeah, I wouldn't mention hibernation. >> >> >> >>> >>> And these could be used outside of safe_copy_page() someday. >>> >>> How about >>> >>> kfence_set_page_present() >>> kfence_set_page_default() >> >> >> Maybe spell out "direct_map" ? >> >> kfence_set_direct_map_present() >> >> kfence_set_direct_map_default() > > They are not necessarily in direct map :) > loongarch does not have direct map, but still supports kfence Ugh :D But where are the pages mapped/unmapped then? (I know, I should read your doc patch) -- Cheers, David