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=-5.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 74A18C433DF for ; Sun, 17 May 2020 00:00:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 48952206F9 for ; Sun, 17 May 2020 00:00:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="XOoFkPnS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726932AbgEQAAx (ORCPT ); Sat, 16 May 2020 20:00:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726670AbgEQAAw (ORCPT ); Sat, 16 May 2020 20:00:52 -0400 Received: from mail-pj1-x1042.google.com (mail-pj1-x1042.google.com [IPv6:2607:f8b0:4864:20::1042]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D06EBC061A0C for ; Sat, 16 May 2020 17:00:52 -0700 (PDT) Received: by mail-pj1-x1042.google.com with SMTP id s69so2901539pjb.4 for ; Sat, 16 May 2020 17:00:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=f1+Us8/YLn1EYw/8uIhzIX+UTGyAfVgf40G32lCNbk0=; b=XOoFkPnS/bNFYcuVH+Aa8rz+lxoFNlh6OCdx/Ty8+0Ts35mLE2Hz+LqXcsUXylYxR0 C8+xGDKoOy9x414nveSQDtS81vAkxgqv4/Nl/V0NZBu0Okzdg9m/f43kNFmpgnU7foBG a9ixxE2Q/Od0bgaLNomzofQPFbPuHetMcN+20kVNts4DIk4vdDFeghMEcAMnQRh5NFZT vvksYHZ/oZSvYyK3jP8pDW6Nj8vwlZ0V+iqE0hxnNZHfAwdfrmumxqOG7VdvPZFvrYHf KVqOQ8okAhQ4MGOA1ELu1rjnXc+hB0x1dHtGAZDAvyAKwqXLvavX6p39FKQ9GhyCimzO fO8g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to:user-agent; bh=f1+Us8/YLn1EYw/8uIhzIX+UTGyAfVgf40G32lCNbk0=; b=OfG+95IvGATA5dDvTEC0mC+4VcI98EAgKxx80O3ic7ZXgJl3w7aZVh9lRFNonfgl+j cIh7Kvqf6KK0Oczny9/qFQQVMzD3J72efeYj9W8vvD7PXRNawXPDQtdq/3GwYjdUJYpS SBKXp+Y4plYJOUyw7m3QmssBpx6S5MT1quBwPmBhw/edGLyLSMKG+nlzWYTHJKBtamSN F7cJdI3+gXGXU12BfIcoj32OFk2xzDcfdYlh0eq1gKbL8gPANcrOWsOYj4i/nUwNbPDC Os3zXqt1jRE6UJAB+E4qmEj4sLmBkz7z8lxjqLLzt2txB7ElvAeF0q1YShLoNO630sXa 4ZQA== X-Gm-Message-State: AOAM530zYNiRK95LuPi/gjB3UtzKB8YkiBHlrOASGoM+jRzvlUV8iZnf TGLaHOCxNzs6JnGbBNQ8wtsv7nx7 X-Google-Smtp-Source: ABdhPJyzuqWiKhG8xM1+tT6YskoHfpX+S+uIzSgIDIzwy81rxQthrmS6oCur2i1B9ygHVu3vOH18KA== X-Received: by 2002:a17:90b:1103:: with SMTP id gi3mr5512703pjb.184.1589673652308; Sat, 16 May 2020 17:00:52 -0700 (PDT) Received: from localhost ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id d20sm4587363pjs.12.2020.05.16.17.00.51 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Sat, 16 May 2020 17:00:51 -0700 (PDT) Date: Sat, 16 May 2020 17:00:50 -0700 From: Guenter Roeck To: Will Deacon Cc: linux-kernel@vger.kernel.org, elver@google.com, tglx@linutronix.de, paulmck@kernel.org, mingo@kernel.org, peterz@infradead.org, "David S. Miller" Subject: Re: [PATCH v5 04/18] sparc32: mm: Reduce allocation size for PMD and PTE tables Message-ID: <20200517000050.GA87467@roeck-us.net> References: <20200511204150.27858-1-will@kernel.org> <20200511204150.27858-5-will@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200511204150.27858-5-will@kernel.org> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, May 11, 2020 at 09:41:36PM +0100, Will Deacon wrote: > Now that the page table allocator can free page table allocations > smaller than PAGE_SIZE, reduce the size of the PMD and PTE allocations > to avoid needlessly wasting memory. > > Cc: "David S. Miller" > Cc: Peter Zijlstra > Signed-off-by: Will Deacon Something in the sparc32 patches in linux-next causes all my sparc32 emulations to crash. bisect points to this patch, but reverting it doesn't help, and neither does reverting the rest of the series. Guenter --- Bisect log: # bad: [bdecf38f228bcca73b31ada98b5b7ba1215eb9c9] Add linux-next specific files for 20200515 # good: [2ef96a5bb12be62ef75b5828c0aab838ebb29cb8] Linux 5.7-rc5 git bisect start 'HEAD' 'v5.7-rc5' # bad: [3674d7aa7a8e61d993886c2fb7c896c5ef85e988] Merge remote-tracking branch 'crypto/master' git bisect bad 3674d7aa7a8e61d993886c2fb7c896c5ef85e988 # bad: [1ab4d6ff0a3ee4b29441d8b0076bc8d4734bd16e] Merge remote-tracking branch 'hwmon-staging/hwmon-next' git bisect bad 1ab4d6ff0a3ee4b29441d8b0076bc8d4734bd16e # good: [dccfae3ab84387c94f2efc574d41efae005eeee5] Merge remote-tracking branch 'tegra/for-next' git bisect good dccfae3ab84387c94f2efc574d41efae005eeee5 # bad: [20f9d1287c9f0047b81497197c9f4893485bbe15] Merge remote-tracking branch 'djw-vfs/vfs-for-next' git bisect bad 20f9d1287c9f0047b81497197c9f4893485bbe15 # bad: [6537897637b5b91f921cb0ac6c465a593f4a665e] Merge remote-tracking branch 'sparc-next/master' git bisect bad 6537897637b5b91f921cb0ac6c465a593f4a665e # good: [bca1583e0693e0ba76450b684c5910f7083eeef4] Merge remote-tracking branch 'mips/mips-next' git bisect good bca1583e0693e0ba76450b684c5910f7083eeef4 # good: [1f12096aca212af8fad3ef58d5673cde691a1452] Merge the lockless page table walk rework into next git bisect good 1f12096aca212af8fad3ef58d5673cde691a1452 # good: [23a457b8d57dc8d0cc1dbd1882993dd2fcc4b0c0] s390: nvme reipl git bisect good 23a457b8d57dc8d0cc1dbd1882993dd2fcc4b0c0 # good: [f57f5010c0c3fe2d924a957ddf1d17fbebb54d47] Merge remote-tracking branch 'risc-v/for-next' git bisect good f57f5010c0c3fe2d924a957ddf1d17fbebb54d47 # good: [1d5fd6c33b04e5d5b665446c3b56f2148f0f1272] sh: add missing DECLARE_EXPORT() for __ashiftrt_r4_xx git bisect good 1d5fd6c33b04e5d5b665446c3b56f2148f0f1272 # bad: [8c8f3156dd40f8bdc58f2ac461374bc804c28e3b] sparc32: mm: Reduce allocation size for PMD and PTE tables git bisect bad 8c8f3156dd40f8bdc58f2ac461374bc804c28e3b # good: [8e958839e4b9fb6ea4385ff2c52d1333a3a618de] sparc32: mm: Restructure sparc32 MMU page-table layout git bisect good 8e958839e4b9fb6ea4385ff2c52d1333a3a618de # good: [3f407976ac2953116cb8880a7a18b63bcc81829d] sparc32: mm: Change pgtable_t type to pte_t * instead of struct page * git bisect good 3f407976ac2953116cb8880a7a18b63bcc81829d # first bad commit: [8c8f3156dd40f8bdc58f2ac461374bc804c28e3b] sparc32: mm: Reduce allocation size for PMD and PTE tables --- Log messages: Lots of: BUG: scheduling while atomic: kthreadd/2/0xffffffff Modules linked in: CPU: 0 PID: 2 Comm: kthreadd Tainted: G W 5.7.0-rc5-next-20200515 #1 [f04f2c94 : here+0x16c/0x250 ] [f04f2df0 : schedule+0x78/0x11c ] [f003f100 : kthreadd+0x188/0x1a4 ] [f0008448 : ret_from_kernel_thread+0xc/0x38 ] [00000000 : 0x0 ] followed by: Kernel panic - not syncing: Aiee, killing interrupt handler! CPU: 0 PID: 19 Comm: cryptomgr_test Tainted: G W 5.7.0-rc5-next-20200515 #1 [f0024400 : do_exit+0x7c8/0xa88 ] [f0075540 : __module_put_and_exit+0xc/0x18 ] [f0221428 : cryptomgr_test+0x28/0x48 ] [f003edc0 : kthread+0xf4/0x12c ] [f0008448 : ret_from_kernel_thread+0xc/0x38 ] [00000000 : 0x0 ]