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 2F3CFC30653 for ; Sun, 7 Jul 2024 08:29:00 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B1FCD6B008C; Sun, 7 Jul 2024 04:28:59 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id AA9016B0092; Sun, 7 Jul 2024 04:28:59 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9235E6B0093; Sun, 7 Jul 2024 04:28:59 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 743326B008C for ; Sun, 7 Jul 2024 04:28:59 -0400 (EDT) Received: from smtpin10.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id E34B61C136A for ; Sun, 7 Jul 2024 08:28:58 +0000 (UTC) X-FDA: 82312281156.10.A298D5C Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by imf20.hostedemail.com (Postfix) with ESMTP id 9E02C1C000B for ; Sun, 7 Jul 2024 08:28:56 +0000 (UTC) Authentication-Results: imf20.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=JwoAZ39S; spf=pass (imf20.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1720340909; 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=9RHWJPg9INiiOPZD2SAh5huypv9jP+1nFy6J/LfVsNQ=; b=2Ff07tHoH9+wCjIFXuqQQ9zrtrHdFuhnthsoLdHrj3z0ebvx8yDS7XbmSyzJRlqHb5vWul YtJviG3zCBPm/Dmu45CiKvDlXbcAwKuReXrKy9ApsfSM9+YwVnf4WeU0mSjrFcH+CZVQiw XOQA3LrIGzgtorR4SjysSP7MUjr3HOw= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1720340909; a=rsa-sha256; cv=none; b=Gq/BApjRhz1Y2ht8+EHA73+ghLnpYsIdRSjalf44l4vpy49juEhmtkUkIdVL2F8WKUMIr4 8BEATeC8w+rbp/FsHC4aqilrhfCCafzDOQZJTRHl7uzbZ+obRfFsq1xKik2BmJFbnhRHy7 1BuEn+wFo9o11aMO223MAfvcvx1sPTo= ARC-Authentication-Results: i=1; imf20.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=JwoAZ39S; spf=pass (imf20.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1720340936; 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=9RHWJPg9INiiOPZD2SAh5huypv9jP+1nFy6J/LfVsNQ=; b=JwoAZ39SFvGjRbn6LG8ojAJUN9Zs2W4Jd78/l2gJzNM0OIYjUI+RvohtOhdJrU681Xluey CKhT/zs4D0LsBaJ8D63AukE5xmMsz7By38wlJI2zOBneCIAtGf/ywBXvmItsbXk6jxjJ9d HIGTQe0LqgNa7OPX+A48kzsULgzmJv0= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-355-ESCHI-_jO3qNk5aAUmo7tA-1; Sun, 07 Jul 2024 04:28:54 -0400 X-MC-Unique: ESCHI-_jO3qNk5aAUmo7tA-1 Received: by mail-wm1-f71.google.com with SMTP id 5b1f17b1804b1-42668699453so794615e9.3 for ; Sun, 07 Jul 2024 01:28:54 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1720340933; x=1720945733; h=content-transfer-encoding:in-reply-to:organization:autocrypt:from :content-language: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=9RHWJPg9INiiOPZD2SAh5huypv9jP+1nFy6J/LfVsNQ=; b=tjZrVSfawY/77+ONa2y8s9nA5PYVmr6J7SfxkbYvfs7ePoeN6NVVoxrDG66ifm40rf 8llQo+regbeU/Fyp/zZYOno5H6iRHCaxg/VX61HkHNedicHjmqjCEbbmLo8EG6V8dS/C 5DMLyTEy/AFboiebvBVteZ5cCh8uG6gSSVDF59745gmiU8hK/qRtRr59HP6at4Rik06r 0F/VTfC8dCfS2U8yqFME5DaDyQFaa+1bTmzda4XittB02dpHQ8L7AC4N8CJIZA2HpabC 63vWMcaA+d/Xg2TCz0cX0iqhSoSXx2ITwbdHLAmxZ01u5fmu6tc7eDm6YCix/nO3EvNm 7c5A== X-Forwarded-Encrypted: i=1; AJvYcCXCJgrFk9wiBPLZZZRYaFbbtoZ6b+J5tGsG3sTvV6U4c54fZK2g6SY9Nn1jE4+OClvUEY92p9BHC2lGoOtQK3iw1WA= X-Gm-Message-State: AOJu0YwHxx6A6uC8sEBd8DH0YaIO4NKh+6jPbLQmQVi9xRO6RD9DqKNY 1/5CM6R4z7MUBZskuzT0VPtWiQqk+vDmEL1UyRMkVOVjppO09T8KvXLZpjTDF9nRFMAlRLrF7di DUUnMhVN22eNKYr8tG7mo41Z4jiMuph9ZTnXA5QlcQd/Dyk7K X-Received: by 2002:a05:600c:1d08:b0:425:6f96:8bee with SMTP id 5b1f17b1804b1-4264a34efe9mr86591315e9.0.1720340933156; Sun, 07 Jul 2024 01:28:53 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFBDkIAj0uC+yoLhRmiFZtVPaxhjALADx0V8DoBHX6FMZ8mPM+NCngUJgMUg0d9kEhOCHmEPg== X-Received: by 2002:a05:600c:1d08:b0:425:6f96:8bee with SMTP id 5b1f17b1804b1-4264a34efe9mr86591175e9.0.1720340932752; Sun, 07 Jul 2024 01:28:52 -0700 (PDT) Received: from ?IPV6:2003:cb:c72f:c00:10f0:d1a8:c206:17ac? (p200300cbc72f0c0010f0d1a8c20617ac.dip0.t-ipconnect.de. [2003:cb:c72f:c00:10f0:d1a8:c206:17ac]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4264a25b5edsm120953975e9.37.2024.07.07.01.28.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 07 Jul 2024 01:28:52 -0700 (PDT) Message-ID: <48727db1-aac8-40d2-be20-9fd7777af62a@redhat.com> Date: Sun, 7 Jul 2024 10:28:51 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH hotfix] mm: fix crashes from deferred split racing folio migration To: Hugh Dickins , Kefeng Wang , Andrew Morton Cc: Baolin Wang , Nhat Pham , Yang Shi , Zi Yan , Barry Song , Matthew Wilcox , linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <29c83d1a-11ca-b6c9-f92e-6ccb322af510@google.com> <20240703193536.78bce768a9330da3a361ca8a@linux-foundation.org> <825653a7-a4d4-89f2-278f-4b18f8f8da5d@google.com> <7b7f2eb7-953a-4aa0-acb0-1ab32c7cc1bf@huawei.com> <68feee73-050e-8e98-7a3a-abf78738d92c@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: <68feee73-050e-8e98-7a3a-abf78738d92c@google.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 9E02C1C000B X-Stat-Signature: 1i445kydan6hgdquwdo9tx77qj7f757g X-Rspamd-Server: rspam09 X-Rspam-User: X-HE-Tag: 1720340936-666148 X-HE-Meta: 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 33JhAgu9 AaR86PKGFdV/n8ZtV2E1FRg3CxKR+5T5W9YU1Tf5a4aH86jwkwOAh5FsBn1A0HxzgmkJWk60bC4Uh+j2qNfEJwWWP303RYFT6lx+8eA5RqFAAXx0ixIPgLciMOP/x2QdIkonr2OqGbC55G9DeZ8JRViwFLe70mNNFuO8Ot8w4i1a8jGhNIkQxCMe5+GD61e7bVsV8fGtTApjrCJZkzfxm2NOY3PXTdbKwh8L/CPI6Pc5HYhK2Db0cHzDsnZ0sCENaEVx6vPMlzcl1X+ruGK7O0fZ2Kb/kqE+kBrLci3Jr9vQDalLx9Pd1WegSrY42y7KLGH9KgB41lHwReLO0dnJMJtYtx4X8zZn/FAsLAdpt62Cg4t4KD4TzNHVZEw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.002675, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > [I guess this is the wrong place to say so, but folio_undo_large_rmappable() > is a dreadful name: it completely obscures what the function actually does, > and gives the false impression that the folio would be !large_rmappable > afterwards. I hope that one day the name gets changed to something like > folio_unqueue_deferred_split() or folio_cancel_deferred_split().] Fully agreed, that is absolutely confusing. (and I thought for a second that the folio would be !large_rmappable afterwards!) -- Cheers, David / dhildenb