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 834E3103E169 for ; Wed, 18 Mar 2026 12:07:15 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E7F4C6B0197; Wed, 18 Mar 2026 08:07:14 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E304E6B0198; Wed, 18 Mar 2026 08:07:14 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D1EDC6B0199; Wed, 18 Mar 2026 08:07:14 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id C18B86B0197 for ; Wed, 18 Mar 2026 08:07:14 -0400 (EDT) Received: from smtpin30.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 72632160579 for ; Wed, 18 Mar 2026 12:07:14 +0000 (UTC) X-FDA: 84559058388.30.2B2380F Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf09.hostedemail.com (Postfix) with ESMTP id 85E94140012 for ; Wed, 18 Mar 2026 12:07:12 +0000 (UTC) Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=leByJek7; spf=pass (imf09.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 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=1773835632; 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=/jako9m7ef30u2KIKlYNuTkvtuk1qZaI001IqwwoxZI=; b=wsSQ2fxid4NZAX+5r+xtN44YeG4ssdgLnzeqO0ZP/z6/4i86LgdP7j24BQ1t1kgAaYFmfu BbyWIRhYL7qukTL8/i9OirPm1ASN/uDh6Pgw8kHpADq2P7AgN0U7zQnZ9Ld6rZcOqVRQ2j YfYFcVJiGf/EaFD15flDd+rmVf8nNnI= ARC-Authentication-Results: i=1; imf09.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=leByJek7; spf=pass (imf09.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1773835632; a=rsa-sha256; cv=none; b=XIGZ14U16/ULVQWI7PsIcxlL8LkMi8WCsXdRMGIOKNU+cVpRQ7XOqBYg4rY7HWuoxA1gGf IH7W7Fb8lsFYTnWHgJ9B5nFM3VmXXIfisBXvX28f5gqudtoucl2lLEhjdGSAd3AsmtnEr2 L/hvtLZGfivI3A2JVMCTO3ji+RFCOTQ= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 13D5E40646; Wed, 18 Mar 2026 12:07:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D426FC2BCB3; Wed, 18 Mar 2026 12:07:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773835630; bh=Qwy/Zw7mfBZ5j/QG9jUPEflfhiHhV/iYcxuVi6gsuBg=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=leByJek7uVZg6cUI421E1qlsRgFu5i1j9Nrcp9TwCu1n/m2wuj0G9A52e2o93gCeH UE8Pm3pCz99lvNY5DqI85yN3uJYOlzA3MSCA7F49p9zmHwWV9oVeNp2NZ1TNGNAfRS oGhFtbj4lm5IYM6RTSEdhV8PdXr6kYryFRfIw7C4fAjIQdQMagG3Z2yZR9xv/SxKwc zK9ZzLYMWbYW2D+n2DghLnEarPNB2t3FbiaIQPvqj5iRhnDXQEt2/q1ki88ccS2Q9s b7uYJ/mi0bRuEp60/+SEKCMz7RW1DeHIkSAEHZKEVgY1R4GQiYyZ8OaOiRipCnMwrN uolUohi6Gzm/A== Message-ID: Date: Wed, 18 Mar 2026 13:07:03 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 0/5] selftests/mm: skip several tests when thp is not available To: Chunyu Hu , Andrew Morton Cc: shuah@kernel.org, linux-mm@kvack.org, ljs@kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev References: <20260317094419.1429259-1-chuhu@redhat.com> <20260317113730.45d5cef4ba84be4df631677f@linux-foundation.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: 85E94140012 X-Stat-Signature: dn5b6q5rd54f3ugb9wka3x1k4p4kn8rt X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1773835632-348475 X-HE-Meta: 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 OJ+c6yUg 9URVS8k+McqKGqxrwx3zn4fvhZN1IlgI+EJ5ND+fQX7+9DO4codm5x2fY7VxoS0JXZatWHZ0PLqriwzlGZdLzK/5SCjtdarUeNr5XCzIpxKpMNS07afFjv8px6WWAQGZOjKjBwKh2LbdZ1QHFMTWf4M50FY4LBwHvcnyH904x+MsOnVmjQ4niY6WvnK/yivrlgHsfebsnqawBMVZaVsoW36HOeJ/JpFcwS0odlznyS0BsNqkraqEHRXqvIsGvag7DTSMtSNaT0UkHm1wRx9/5BvnOhEixCEf5HlAzzzRWC/weCeRxl5JjIZOXd38ZKbCDOuFPQyu/BKBQ8krQAAExuUWFPw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/18/26 10:22, Chunyu Hu wrote: > On Tue, Mar 17, 2026 at 11:37:30AM -0700, Andrew Morton wrote: >> On Tue, 17 Mar 2026 17:44:14 +0800 Chunyu Hu wrote: >> >>> There are several tests requires transprarent hugepages, when run on thp >>> disabled kernel such as realtime kernel, there will be false negative. >>> Mark those tests as skip when thp is not available. >> >> AI review asked some questions: >> https://sashiko.dev/#/patchset/20260317094419.1429259-1-chuhu%40redhat.com > > Hi Andrew, > > Nice tool. > > For question one. In guard-region test, collapse tests are for checking > collapse is denied when operating on guard region, not for checking > madvise(MADV_COLLAPSE) will fail when thp is setup to 'never with sysfs, > result is same, but it's a different test. Maybe we don't have strong > interest to test when thp is set to 'never' in this collapse test. > Do you perfer we let it run when thp is setup with 'never'? > > For question two. In soft dirty test. Yes, test_mprotect skip logic has > similar issue when open failed. 'Bail out' would be shown. Maybe we > do this in other series or you prefer me to fix it in this series? IMHO, that's something for another series (if at all). > > For question three. Add buffer length check in write_file() helper and > check if written bytes equal expected bytes. It's easy to add a buffer > lenghth check and make it robust. It's not easy to do the partial > written check as that will make the helper more complex and need one > more parameter as expected written bytes. Maybe for such question, we > should do with other series, not in this one? The AI brings up many things that are irrelevant in practice (in particular for tests). So I wouldn't worry about that. You are only moving code. -- Cheers, David