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 A175DC79F9F for ; Thu, 10 Sep 2026 13:14:50 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BBEEC6B0095; Thu, 10 Sep 2026 09:14:49 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B969B6B0096; Thu, 10 Sep 2026 09:14:49 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A85466B0098; Thu, 10 Sep 2026 09:14:49 -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 87F0B6B0095 for ; Thu, 10 Sep 2026 09:14:49 -0400 (EDT) Received: from smtpin24.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay01.hostedemail.com (Postfix) with ESMTP id E60C91C2520 for ; Thu, 10 Sep 2026 13:14:48 +0000 (UTC) X-FDA: 85197897456.24.45F2627 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf27.hostedemail.com (Postfix) with ESMTP id 143F84000D for ; Thu, 10 Sep 2026 13:14:46 +0000 (UTC) Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=O1UWoH0w; spf=pass (imf27.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1789046087; 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=obrsEf1MMzEije3mF7OvjrrlMFk7kbRaeS4alytnrZA=; b=iQAoV6odLSMINN1wwUOvDRQNfUeWGiPcfTu73YBKkkGVel32k/O4APb4b+flVb7rm2/EKo 6MwaMw6sJAwJH6Fs4PGP5p2qMDBZd1pIOMaEAVOI/KGUHFphxshYiwW/++rf22RMtS061n ek5cfPRuuupBKs9vBkuomZjQrEqMcBs= ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1789046087; b=psFced/yMQQLbueuEANkbpQ1YeDPPA/VJ8s9cEWvYQ4RdBi2QHkDXnj3f4F1XM2uHvsSYD Qz3X78dD6pEfkW6y5hF9lyV3MNPNV5n4jsP/lAnQ3ZO6Ly9ZxhIdwioe9eqAp4/I/HP0CH ee9rrLH9PDIObD6oCpvIw0O1Z+CguLY= ARC-Authentication-Results: i=1; imf27.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=O1UWoH0w; spf=pass (imf27.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 64963600E2; Thu, 10 Sep 2026 13:14:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 337541F00893; Thu, 10 Sep 2026 13:14:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789046086; bh=obrsEf1MMzEije3mF7OvjrrlMFk7kbRaeS4alytnrZA=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=O1UWoH0wjxnkd0+6YaNDY/1W8OkDpvWuJwac8Ox+sLdrh2d5ZeNWuC552Ce3xc6OL Lerke7gJsYZX24q11I5HKpfvO17Ai28S+4dD2G5Xhx3uOfQruwhU9n4u3f5dCTNKc6 lEjiFdilNrqqyf6ZK3giQ8X08NnunzlK6mWbdt616AQ3aDdFEigHIm44+JrAigQMJE sgfMLJrYiJNVrOiE2AcZZoSq26Ng1A4Dynn7jetvjnO9gMCFBvXh4NWGOHXEThUjNf gabXjDTR3V5R+OkhxLRjN6Hg3RcUBvRNgfzZ2KbnwGBckpsv0FdDIJ54mYyqNbU8Ni k4kak9nneVsAg== Message-ID: <8d27168e-5443-4073-bc65-24ddbe32e29a@kernel.org> Date: Thu, 10 Sep 2026 15:14:36 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 3/3] kselftest: mm: introduce alloc_isolated_mem() To: Yeoreum Yun Cc: Andrew Morton , Lorenzo Stoakes , Zi Yan , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , Kevin Brodsky , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260907-fix_split-v5-3-822b810458bc@arm.com> <5c05b620-7a2f-453d-9725-fed4f536a019@kernel.org> <31418d0e-9745-4e8d-bc02-dbbd5cb9e193@kernel.org> <11a36d52-89a0-4f43-8a51-a4930e171ba0@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-Server: rspam04 X-Rspam-User: X-Stat-Signature: k33diswpsm99wxfco7zbqpcfhk75yqht X-Rspamd-Queue-Id: 143F84000D X-HE-Tag: 1789046086-432587 X-HE-Meta: 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 GNZcR329 nCV7T5+/deGbFM/z9c7vsSQJVinZMDyAB3XWmVOkXuqLBNn3PGQf7LVofnzAQap+ocQkw27XsSf/gE+Rg7pdxHNOdZs4w7dYYV/GeBnKWkrUuNEPBrz62IQPWYd0inG8Mxidqk47xofuFdvCsfsH/op63iNkYS/aOd5iSLbbUQ5VmZ8bcMIMkecIuy3/TcweiIV46FU7xV0V4pyGUQ5ytEbR5Ka31RRaB71HBTyYVSWtj9XMg1qLx9Kik+hNZ3HQFfjz2d1OjemJ0TaIVB3W2lyb036365gH3r3mqdi2RcyYILjK0/eLGiFLvRQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/10/26 14:34, Yeoreum Yun wrote: > On Thu, Sep 10, 2026 at 02:25:40PM +0200, David Hildenbrand (Arm) wrote: >> On 9/10/26 14:16, Yeoreum Yun wrote: >>> >>> True. I overlooked guard bit is sticky. >>> >>> >>> It's enough but alloc_isolated_mem() could be modified to allocate with >>> PROT_NONE first and then change the prot. >>> >>> It seems whether make a helper or testcase should write the code >>> properly in case of unwanted VMA merge. >>> >>> IMHO, instead of testcase write them all >> >> So far I am aware of exactly one test case, which others do absolutely need this? > > True. I'll respin with your suggestion. Don't get me wrong, if we'll need this for other tests we can add helpers. But for a single user adding a helper is not really worth it. -- Cheers, David