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 X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C48CBC2D0C2 for ; Mon, 30 Dec 2019 17:39:24 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 779F82071E for ; Mon, 30 Dec 2019 17:39:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 779F82071E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arndb.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id D24DC8E0005; Mon, 30 Dec 2019 12:39:23 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id CD5268E0003; Mon, 30 Dec 2019 12:39:23 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C11B58E0005; Mon, 30 Dec 2019 12:39:23 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0160.hostedemail.com [216.40.44.160]) by kanga.kvack.org (Postfix) with ESMTP id AB9A08E0003 for ; Mon, 30 Dec 2019 12:39:23 -0500 (EST) Received: from smtpin29.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with SMTP id 4CA2C181AC9B6 for ; Mon, 30 Dec 2019 17:39:23 +0000 (UTC) X-FDA: 76322519406.29.shoe29_51dd1d6b9f85d X-HE-Tag: shoe29_51dd1d6b9f85d X-Filterd-Recvd-Size: 5181 Received: from mout.kundenserver.de (mout.kundenserver.de [212.227.126.130]) by imf41.hostedemail.com (Postfix) with ESMTP for ; Mon, 30 Dec 2019 17:39:22 +0000 (UTC) Received: from mail-qt1-f177.google.com ([209.85.160.177]) by mrelayeu.kundenserver.de (mreue011 [212.227.15.129]) with ESMTPSA (Nemesis) id 1Mf0Ru-1jMxSU3Ybq-00gXce for ; Mon, 30 Dec 2019 18:39:21 +0100 Received: by mail-qt1-f177.google.com with SMTP id 5so30082684qtz.1 for ; Mon, 30 Dec 2019 09:39:20 -0800 (PST) X-Gm-Message-State: APjAAAXgO5SKnauG/mEtbxZbqn1tsJ6zgSt6LZNr6kYRYjt0dlXLOKGw zbrSYu2aeGdEvMs+Y1Hlrtu4iL9+RRS4S8TIcJs= X-Google-Smtp-Source: APXvYqwnD5iz5chu2n8IVFl35LQlRb9qLrlswn/Gct0QDUKDOTU1cr+JNo//6JX4FNiOo6cuOumDCkiZXs5dON08DwY= X-Received: by 2002:ac8:3a27:: with SMTP id w36mr48468057qte.204.1577727559521; Mon, 30 Dec 2019 09:39:19 -0800 (PST) MIME-Version: 1.0 References: <20191220184955.223741-1-glider@google.com> <20191220184955.223741-21-glider@google.com> In-Reply-To: <20191220184955.223741-21-glider@google.com> From: Arnd Bergmann Date: Mon, 30 Dec 2019 18:39:03 +0100 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH RFC v4 20/42] kmsan: x86: increase stack sizes in KMSAN builds To: Alexander Potapenko Cc: Jens Axboe , Andy Lutomirski , Vegard Nossum , Dmitry Vyukov , Marco Elver , Andrey Konovalov , Christoph Hellwig , Linux-MM , Al Viro , Andreas Dilger , Andrew Morton , Andrey Ryabinin , Ard Biesheuvel , Christoph Hellwig , "Darrick J. Wong" , David Miller , Dmitry Torokhov , Eric Biggers , Eric Dumazet , Eric Van Hensbergen , gregkh , Harry Wentland , Herbert Xu , Ilya Leoshkevich , Ingo Molnar , Jason Wang , Marek Szyprowski , Mark Rutland , "Martin K. Petersen" , Martin Schwidefsky , Matthew Wilcox , "Michael S. Tsirkin" , Michal Hocko , Michal Simek , Petr Mladek , Qian Cai , Randy Dunlap , Robin Murphy , Sergey Senozhatsky , Steven Rostedt , Takashi Iwai , "Theodore Ts'o" , Thomas Gleixner , Vasily Gorbik , Wolfram Sang Content-Type: text/plain; charset="UTF-8" X-Provags-ID: V03:K1:dmiBnyg7PQNNgdggU9YOmWfYsEIzu5Zw2V0CadZtC+VxMFIFnJ3 ZIlAxYzzwUJCGVqgbeawJah2Ks091F2R5iGSdxOOY2/BgAwW03yXVXrc6uyVtPdRfs1DAmy rhZTqIk+XCjeHzi8uzao3guZUhHR7eiSeo+4/nE1wnvo1c14L0qaWgMZQP572mYEU4UmTwC vN6l/82E+sAAtw7nfm6jQ== X-UI-Out-Filterresults: notjunk:1;V03:K0:zckpS4yICsw=:RaZD8LXoNFnPZbsHk8WNgW KKsK01rjfg0QKkcXRk0fis8OFXItGUl89l6PK9lJdCzHFF/QF+4ietpbRNSyMZguw6yhgZjIB JZZEG8+DyRTpQt0ist5QO1AwavgMIgmi6HvScTGrN3TOVhiM8KOC/Ix16XT+HM5EbYjnt2Zet LGegA4+yS5SjmhTYH2H5/4dXONGTYB0i6P+D9kWVg7x/3tyeoLlWc8wp0KC6DG2mSOFB7vNWM vhD3OYCb/fDq1qPZ5Q05Qa4RRsFMHrNOj9LBXm8jvJODIqkXkBywB1bmoOwXzt+q+DOCNKCNU LyrtOrLm3PHmy2gKHweMj9Sb8gGUwoeGoGyDg/zAE1LuleXC0Fz5oGZ73bV3mAlzzTxDiy3yl NqLK43JjklZqPA3I1QKVX490M4GdbzrL9K9lXSlzFwVRR9tSUH/uxu1pj53tag6sKZCIq1mg2 pkQx2bmviPSKCkJI/7726pUZy3AUW7NUt1pfE4TZFodwXlA/3SyKf7ropuRER/0hRc14h4+g2 g/XEzDuOKe+dqq2RXVT4Te1gEFI6g89PS+h1FacJqULOioJHQpYIRzd7WfrTxk2vAqxo9XElS N3+p63pferM1hRJBXIb5SFECYgvpZMpAKPqVhEqG5xDsrrFGjbO6JDXUgY/XCcyZi4ljlByJT 6JWvrl5V+8yUEjd5Wvsh6Rcp4QSoeTap2Wir0XyfsHLe3q0NKI72+BzsTtOlhD1yjkv3hOKi5 STMEfjxLNECAxvmyaUfdkAvFQcTAZEdr12jejD7LcNjXsd4E1aEAa8AY3t04xZtTotvnr4STs Bg4Wtnz94jlCxc+h5G1836n8Qu658RxgxpBwRwv8ExYx5LGafIdQd2plB+tuRgA8mCDsr8YbR 2fu6R3TX4vvWZ189WG4g== 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: On Sun, Dec 22, 2019 at 2:25 PM wrote: > > KMSAN instruments the code heavily, increasing register pressure and > preventing functions from being inlined. As a result, the kernel > requires more stack space to run. > > Rename KASAN_STACK_ORDER to EXTRA_STACK_ORDER and set EXTRA_STACK_ORDER > to 2 for KMSAN builds, effectively making the stacks 4 times larger. > > Signed-off-by: Alexander Potapenko What about CONFIG_FRAME_WARN? Do you need to change that as well to get a warning-free build? If so, what is the minimum value that you need? Arnd