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 C13BEC9832F for ; Sun, 18 Jan 2026 14:11:30 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 9B9436B0005; Sun, 18 Jan 2026 09:11:29 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 970126B0089; Sun, 18 Jan 2026 09:11:29 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 872B26B008A; Sun, 18 Jan 2026 09:11:29 -0500 (EST) 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 772556B0005 for ; Sun, 18 Jan 2026 09:11:29 -0500 (EST) Received: from smtpin05.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 15802D1F01 for ; Sun, 18 Jan 2026 14:11:29 +0000 (UTC) X-FDA: 84345272298.05.B710B03 Received: from mail-pg1-f182.google.com (mail-pg1-f182.google.com [209.85.215.182]) by imf10.hostedemail.com (Postfix) with ESMTP id 2530DC0008 for ; Sun, 18 Jan 2026 14:11:26 +0000 (UTC) Authentication-Results: imf10.hostedemail.com; dkim=pass header.d=gmail.com header.s=20230601 header.b="f/iqI0wp"; spf=pass (imf10.hostedemail.com: domain of seakeel@gmail.com designates 209.85.215.182 as permitted sender) smtp.mailfrom=seakeel@gmail.com; dmarc=pass (policy=none) header.from=gmail.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1768745487; 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=AqDJGvudyOS3k99PpLPEmecPUls9OZTpXwxY9UHrGPM=; b=GOM3QG1btFYm9byR+FXKjR4Y8r38kDx4fGJ/vO8AVGW+yFRtScTH79/gPARtzbA/Wt+E8u 9kbXbDZG4Eo+OVhL8XAds1sshwqoJl5dsD2TKP/jhLVdcrles2sbPHoFGV3ZzJpLinGqHN twk32wCtG8ws05DQLjKzmwQepRcBYiQ= ARC-Authentication-Results: i=1; imf10.hostedemail.com; dkim=pass header.d=gmail.com header.s=20230601 header.b="f/iqI0wp"; spf=pass (imf10.hostedemail.com: domain of seakeel@gmail.com designates 209.85.215.182 as permitted sender) smtp.mailfrom=seakeel@gmail.com; dmarc=pass (policy=none) header.from=gmail.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1768745487; a=rsa-sha256; cv=none; b=NenSjWZb24/3C4YbJ6z8QCl1P1gQ9/9frnugMK+1r1hvUjfdvS9W+k4n6tzbZXPfbrQ8Ep ftMd5Uvs68OCX3ZKbNwzmeb5whyKyxUHWwZ+nM79n5HbjkuPY2nU2FgXXNJH/7fbxwNweB 68S97r96MVavUjscuWbbdVUjI9LVWFE= Received: by mail-pg1-f182.google.com with SMTP id 41be03b00d2f7-bc274b8b15bso2214514a12.1 for ; Sun, 18 Jan 2026 06:11:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1768745486; x=1769350286; darn=kvack.org; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=AqDJGvudyOS3k99PpLPEmecPUls9OZTpXwxY9UHrGPM=; b=f/iqI0wp22w6YQzZefHhQju3/VIyYXo36FwsWFgbig5aEziy8QmliNh74xjV8c0N57 iEVx1wS4V3OA7dDSDbOdr2vZSSD1PE2ggYDQOauc2wA2DEw6O3vRVzUAknn/OQxnn/gk o0l+CaQUtmSJ0+SolNEh6933hFPqL2J2g6DYvy/In7/lUOY3PtCHoYaRynbd/bFybd5+ yo6qLMHC6M6CPw6NKCe2cfvg7Civqb8ScSykukuQ1CxV4kiXqjTKs65TjvI80YVPdULv 1EZR5bzikFXV4WclA+R2XPnAoJcXRWGP2x2T5GwfXMfv344qQIdE7CvdhW5pRuBnzOx6 HwSQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1768745486; x=1769350286; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-gg:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=AqDJGvudyOS3k99PpLPEmecPUls9OZTpXwxY9UHrGPM=; b=Nfi+zmbdtlfWR3YQY92wuOt9b0qdowl57VJslUYb2HDB89K8u+BymKgoMGgWfVxmq8 thxQVWXt79HoSbyUl5iIYJt1AcSK5HHNGevFOlIlWIfcrbaYiOLlW1gk8k0Hft0Vrf0R dskLPsU9d1RH2EMRzaWqZk/VaBH5bc6lss14PS13y+jumc2uqvxwLpFbsESk5qI7ZBn4 iM9fIPcv5IE2bkRw9xPXqiH9ffdDEVGVRvWQ8ruB3ODSA+23ZYWsabOIV+GnbFIGOoVn UOacLOsZ5CS6lUDaCedSk2n3eQWTtQ/GWFQMGcc2wo7otWckH9I9X8AATZkSlkqZfJMb +gNQ== X-Forwarded-Encrypted: i=1; AJvYcCUSXCP/ldXhyOFg8EZbPJZ/CdEVBxqPUQRy1DA1L5iGlPMwoe4qt1Sr/wo4kC+/35Kvo2SBAA6fpw==@kvack.org X-Gm-Message-State: AOJu0YyN8/TGW6QFdgDoTutU11y80eD2OlyjiW8TiqXDt6ydSR47NOje 8ntV+lRZxFCFTl2hPOSWGsLWlAxW4AoT2qFpzMch38U78W3JkR65gDHK X-Gm-Gg: AY/fxX5uPFGOe49pIn4M4q6APK/rrj9co2ulfBLjtAPuADSxKPJjAoVuFH7Tx+aeRYy YjzPMd/3tH6DUWQRfNresq07kn0LiCePlIXrbg7qEQxkfoQ7A/pT+Mw6DUAycJm7wHc5o+a7N8M zRWzQcHwd2M7A2z4Zndc+h6/t+Gao7NQt4yI2zOpmruWXIJZ4TfTwbR+kn0Oiq1PnTBhtD4iX48 RKwgZp/pjfyjxZ+36g8RrOTNBaiFRtfN/Fmjtgx5dePBvSNVSMMmJjfyE/3catgipSgbbCvYYpo RYGI+qsFJjEjjwY99wdWbKOrn2cMrf/AY5vMIMTCNwV8Qxb330uMboPELAV9o9jBUetbIdgYrMy Hqz9KLXVj+5ZH29uMI+hw1Xb+2PHlHh2h493Qf9XXMNIJXOc54wIIlZjf2GT0AKgMxrOfcrtv0b nawLpiUFYS X-Received: by 2002:a05:6a20:a122:b0:37e:61fc:a896 with SMTP id adf61e73a8af0-38dfe7c3042mr7636975637.66.1768745485767; Sun, 18 Jan 2026 06:11:25 -0800 (PST) Received: from [192.168.2.226] ([114.92.45.6]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c5edf32d1f1sm6549138a12.22.2026.01.18.06.10.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 18 Jan 2026 06:11:25 -0800 (PST) Message-ID: Date: Sun, 18 Jan 2026 22:10:50 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/pgtable: convert pgtable_t to ptdesc pointer To: "David Hildenbrand (Red Hat)" , Matthew Wilcox Cc: Mike Rapoport , alexs@kernel.org, Richard Henderson , Matt Turner , Magnus Lindholm , Vineet Gupta , Russell King , Will Deacon , "Aneesh Kumar K.V" , Andrew Morton , Nick Piggin , Peter Zijlstra , Catalin Marinas , Guo Ren , Brian Cain , Huacai Chen , WANG Xuerui , Geert Uytterhoeven , Michal Simek , Thomas Bogendoerfer , Dinh Nguyen , Jonas Bonn , Stefan Kristiansson , Stafford Horne , "James E.J. Bottomley" , Helge Deller , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , Richard Weinberger , Anton Ivanov , Johannes Berg , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , "H. Peter Anvin" , Andy Lutomirski , Chris Zankel , Max Filippov , Arnd Bergmann , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , "open list:ALPHA PORT" , open list , "open list:SYNOPSYS ARC ARCHITECTURE" , "moderated list:ARM PORT" , "open list:MMU GATHER AND TLB INVALIDATION" , "open list:MMU GATHER AND TLB INVALIDATION" , "open list:C-SKY ARCHITECTURE" , "open list:QUALCOMM HEXAGON ARCHITECTURE" , "open list:LOONGARCH" , "open list:M68K ARCHITECTURE" , "open list:MIPS" , "open list:OPENRISC ARCHITECTURE" , "open list:PARISC ARCHITECTURE" , "open list:RISC-V ARCHITECTURE" , "open list:SUPERH" , "open list:USER-MODE LINUX (UML)" References: <20260107064642.15771-1-alexs@kernel.org> <080e493a-e4f1-4c97-a3e1-f76f126b5213@gmail.com> <1d110134-89ab-474b-bca6-cfbfd4b5057f@gmail.com> <85a0be43-3598-435d-a50e-9403b7e963f7@gmail.com> <4fd1610b-acc5-4c17-a227-4d63272d3718@kernel.org> Content-Language: en-US From: Alex Shi In-Reply-To: <4fd1610b-acc5-4c17-a227-4d63272d3718@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Stat-Signature: hyniytbdch5si44wtgtybt47b3dqnxod X-Rspamd-Queue-Id: 2530DC0008 X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1768745486-616616 X-HE-Meta: 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 OU/UWy8L 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2026/1/18 18:51, David Hildenbrand (Red Hat) wrote: > On 1/18/26 09:13, Alex Shi wrote: >> >> >> On 2026/1/8 10:23, Alex Shi wrote: >>> >>> >>> On 2026/1/7 22:48, Matthew Wilcox wrote: >>>> On Wed, Jan 07, 2026 at 05:28:36PM +0800, Alex Shi wrote: >>>>> Right, I will fix this. and sent the 2nd version. >>>> No, the patch is stupid and wrong.  Don't send a v2.  You seem to >>>> have a >>>> hairtrigger resend, so I'm trying to prevent a v2 being sent instead of >>>> sending a patient reply. >>> >>> Hi Matthew, >>> >>> I hear you—no v2 will be sent. >>> but sorry for a bit confusing, what's your expected fix? is the too >>> quick resenting? or the direction to alignment pgtable_t with ptdesc is >>> wrong? >> >> Hi Willy, Do you mind to share the detailed concern for this patch? > > I think we recently had a discussion that we should much rather rework > core code to consistently make pgtable_t a pointer to the start of the > page table or something like that. > > Because the way you change the code just means that we will not be able > to handle code that fits multiple pages tables into a single page > (s390x, ppc) consistently. > >     arch/s390/include/asm/page.h:typedef pte_t *pgtable_t; > Got it. Thanks a lot for the explanation!