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 C842BC43458 for ; Tue, 14 Jul 2026 12:34:45 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BDB9D6B00AE; Tue, 14 Jul 2026 08:34:44 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id BB32C6B00B0; Tue, 14 Jul 2026 08:34:44 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AA4B26B00B2; Tue, 14 Jul 2026 08:34:44 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 776256B00AE for ; Tue, 14 Jul 2026 08:34:44 -0400 (EDT) Received: from smtpin18.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay04.hostedemail.com (Postfix) with ESMTP id EE9C01A0368 for ; Tue, 14 Jul 2026 12:34:43 +0000 (UTC) X-FDA: 84987326046.18.0BDE05C Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf01.hostedemail.com (Postfix) with ESMTP id 203A24000B for ; Tue, 14 Jul 2026 12:34:41 +0000 (UTC) Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=m5y+Y5m8; spf=pass (imf01.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; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1784032482; b=Dya1BotYw+CzgdDnX2srfpzVVk3tJve/0fNHHIkOrTNfepY/SYUzyTC9BjMRfkDdVMKub4 CEV4jo3acD5X2mGrYwxL8XyhFN2vRQleqqg0I71zYY0GmtPabDi2udE6eowyKqDAf2a444 psl9VPofYxFmWAqb64WzeyTv9my24J4= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=m5y+Y5m8; spf=pass (imf01.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=1784032482; 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=uVytudVAAcqH1Z8T6UeJAlMy3Z7xi4X8Sx5JR/ITQnM=; b=KZsdZN018c285f3VudsCSnpCPglhH8Y9AkLALjIaClqRnXGcOZDnUGLqmWbaY7na+93yKu wQWiTFay1F4t35jINH/h7LKRwihTFrRZ/C+hK2UaFjY3/rULZANa2UCBfGi81avGJ5S8e8 3gC+AaHD+VmLKnghqXqx9+CxsIMAA5k= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id F145740BDF; Tue, 14 Jul 2026 12:34:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BAC841F00A3D; Tue, 14 Jul 2026 12:34:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784032480; bh=uVytudVAAcqH1Z8T6UeJAlMy3Z7xi4X8Sx5JR/ITQnM=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=m5y+Y5m8x2Q09OuM6TSOdPfuimhJQPHbp3cXrXsx0i7ySC+ttDKKeVA7SrYLOVCpm FBnLvkILmQGhDl8glfx6icSWfsEtIyLwkESdbmsjr0+Lb/SrMtgw8N6kXPcwq4/wD4 5ulcjRMt8dQ6GInb/jGqLjdI+aSi0Aiv9F5Ktica9Vcc4sr8vWynMBrjFu0KfJsPbv FdcOX7ImV5LDJPC0Dfrz/V1xmJGz6e904cW0U3NQFkgpxex1fmL+nYceVkivNSERvD MQdTabyks0ofwHIgatcyAKriO3SlH3ehbnElyL1niTx5dAUfv/Fms4CNz+cbG4GSjO eB+Q0QngQfNBg== Message-ID: Date: Tue, 14 Jul 2026 14:34:38 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm: thp: unlock i_mmap before releasing split folios To: Kiryl Shutsemau Cc: Zi Yan , Hao Zhang , Andrew Morton , Lorenzo Stoakes , linux-mm@kvack.org References: <20260710071344.GA106129@zh-pc> <1fc81157-824c-4296-ac5f-e8965f64597e@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-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 203A24000B X-Stat-Signature: ta93m43jo5ucawt1gra8bxiweqii3767 X-HE-Tag: 1784032481-439344 X-HE-Meta: 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 F5PgTVbO NBI8VZ3bn3OmHxtQ3+9E+nPF20AAKuxiV7BH+rtn0S5anIHemTIsPsJNfscDoqorUwpiCnqNe6BxPbWtH2+AdfsgaFU75/pXVcVRuIzJSuXrPRNjl6R3L8B4I1em7LrithmENjZzp3wcieGrdLrFjIhd9kzJdowZ+peOAN0C7/X/lh3ybrNq+0k+bn3M8C73OhrkWQCk/NsdLYPg39rN+1Y7X5A7sOgvZyk4gV4nRzNcRC8WHeFkxTmnHUep/zLT43XJRqhmgDTQh1a8mCiiuWfiGNu3mi07HxQlSoHM2CLId4XXu2Nxln9q8jQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/14/26 14:17, Kiryl Shutsemau wrote: > On Tue, Jul 14, 2026 at 01:29:56PM +0200, David Hildenbrand (Arm) wrote: >>> Any opinions? >> >> I guess a deferred iput through some workqueue is not an option? > > Hm. This feels like a dirty hack to me. > >> I'd prefer if we could keep folio splitting working even when the passed page is >> EOF. > > Can you think of legitimate use-case? > > I will get rid of hwpoison case. It has no good reason to lock tail page > in the first place. If we can get that out of the way, fine with me. -- Cheers, David