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 65D92C79FB9 for ; Thu, 10 Sep 2026 11:57:37 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 629F86B0095; Thu, 10 Sep 2026 07:57:36 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6014F6B0096; Thu, 10 Sep 2026 07:57:36 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 517876B0098; Thu, 10 Sep 2026 07:57:36 -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 31D0A6B0095 for ; Thu, 10 Sep 2026 07:57:36 -0400 (EDT) Received: from smtpin15.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay03.hostedemail.com (Postfix) with ESMTP id CEDEAA0514 for ; Thu, 10 Sep 2026 11:57:35 +0000 (UTC) X-FDA: 85197702870.15.D75AB25 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf25.hostedemail.com (Postfix) with ESMTP id 209EBA000C for ; Thu, 10 Sep 2026 11:57:33 +0000 (UTC) Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=iZL9wiLq; spf=pass (imf25.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=1789041454; 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=Mgh8waXa9eS3cTcLGuswtFpFRzduf+4/BpkuuXgbHnc=; b=RVQXnYjmz0i5Hh/v9Y1wzBb8v1jvnlQbEMKGonn46CFbqB+v8gjn7f8F3bRzlZ/PAb7sr8 r7SDktruNs7dTcQwn8UejYS6z880eZVcgq1vel3LUJZPTxng4dhkUSDuNVlBGBhklYUTxb fZKoNr4bmQ2QwmeoUmJGXssZavRpQrI= ARC-Authentication-Results: i=1; imf25.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=iZL9wiLq; spf=pass (imf25.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-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1789041454; b=PfiSfwdVrQzydK8AXgWUNut+40V8NS8PfmtaffdxTmNf/850+126+RHb2vucxyYKnG5gTz sUh7kbIUIVaDXsCeEf3sdFhWGowtR21cNj2Wrje/i2eYT6GW2HHUwpxAYnLtw85+xeeJRt m+retqQY9Eidu8RTxSi/YwSuxjW0qaU= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id A6E28600CB; Thu, 10 Sep 2026 11:57:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6887B1F000FF; Thu, 10 Sep 2026 11:57:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789041453; bh=Mgh8waXa9eS3cTcLGuswtFpFRzduf+4/BpkuuXgbHnc=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=iZL9wiLq7AUskmc+WJh3qzBBsQ6sONeIgaI+0RRAYtyX30gteNdyL/GReVBlp2E+w CKU7Q+TiwPuC7pH/4qxX7FlUkR9AvQcli5bW5zgIUwUp9N+Jw/P2PT0w4Wb6YBvoFY CgKs3QiX7/D5mq3BI/w+ndqMCRV8yFtHM/X3J5XYo04Tt5TR3FINWBtQ1vJQ1GdgOc sD6/MAq/GoFWVSgI6IdMVSoadiOf8r9CVghoUO8jBT4Xndj+Orx12FlBYtQa9yAvn/ Fhqr7P9vAGUE1dm46VrkqKPXlrJiDgKympDAHwhFDG5Dx9L+gIZHy38en6b11YFraW 5B+kn8i4wBKgQ== Message-ID: <561b379d-7ab3-4f78-94d9-7a056c5ddb1c@kernel.org> Date: Thu, 10 Sep 2026 13:57:26 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/4] mm: replace PF_KCOMPACTD flag with kthread_func() check To: Kefeng Wang , brauner@kernel.org, djwong@kernel.org, cem@kernel.org, akpm@linux-foundation.org, vbabka@kernel.org, surenb@google.com, mhocko@suse.com, brendan.jackman@linux.dev, hannes@cmpxchg.org, ziy@nvidia.com, qi.zheng@linux.dev, shakeel.butt@linux.dev, ljs@kernel.org Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org References: <20260902131653.1338227-1-wangkefeng.wang@huawei.com> <20260902131653.1338227-5-wangkefeng.wang@huawei.com> 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: <20260902131653.1338227-5-wangkefeng.wang@huawei.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Stat-Signature: 3we34t13dr53p8prt6ioxhcqrqxa37tb X-Rspamd-Queue-Id: 209EBA000C X-Rspamd-Server: rspam07 X-HE-Tag: 1789041453-381206 X-HE-Meta: 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 GGCMj5oA Lq0dmbjaRaOGBfNqYrDczKPXXD0wN9wlIhqdi2DKaDUsXDfKflJm9RnkOHhqL57mPw1ltOUrDIwcmGVY9N6Q+RMkMkZgF2oJor78B9jfmauTx8P4oS7VWvs/x/y2ODltuZ1QIA4no7fEhEwOretM/Ny+VsUuKVf7zk4ZYQv6xU9GsuZ9gWioTgwdzJ+zp4mJEzJU7s7Qt/AxU7+T6CBP9a5H0+N0+M4LzKaCR7F64qVkNk4OdOeoF+F4N8B2vhiEFG1phG0Ah5iXN/Dkg46fr04fNoZ9DYY21YCfep4bvRNqhQ146KRJfkn/z8Lm2a3oXFJDzg2vICbaU3jdxa4pgKLPSUd0pN77TRAB7 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/2/26 15:16, Kefeng Wang wrote: > PF_KCOMPACTD was introduced by commit ce6d9c1c2b5c ("NFS: fix > nfs_release_folio() to not deadlock via kcompactd writeback") so > nfs_release_folio() could detect kcompactd context and skip > writeback. The flag is only consumed by current_is_kcompactd(), > whose sole caller is nfs_release_folio(). > > Replace the flag-based check with kthread_func(current) == kcompactd, > freeing the 0x00010000 PF flag bit. > > Signed-off-by: Kefeng Wang > --- Reviewed-by: David Hildenbrand (Arm) -- Cheers, David