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=-7.0 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED 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 093BFC43387 for ; Tue, 15 Jan 2019 10:44:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8FCE520651 for ; Tue, 15 Jan 2019 10:44:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ozlabs-ru.20150623.gappssmtp.com header.i=@ozlabs-ru.20150623.gappssmtp.com header.b="x0nMJWSU" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729046AbfAOKob (ORCPT ); Tue, 15 Jan 2019 05:44:31 -0500 Received: from mail-pl1-f193.google.com ([209.85.214.193]:43768 "EHLO mail-pl1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729026AbfAOKoa (ORCPT ); Tue, 15 Jan 2019 05:44:30 -0500 Received: by mail-pl1-f193.google.com with SMTP id gn14so1099260plb.10 for ; Tue, 15 Jan 2019 02:44:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ozlabs-ru.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:openpgp:autocrypt:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=WllZXI1zkPNtj7hUq79fLITy+6rZRMnfwbXQ3MGWqeA=; b=x0nMJWSUvk/1VqqyuVkjQ2/5/NyT9hPJxfj3j9cYV1LcakL0b77ZhyEBtr+Go1AgPK 2Y8zamrig0Ojy9xkz/9dn5WKytFBZUcMyYSXSB8IwsnqXVZRC3eLD583dyYxmonWu/Lv u8KT0O3xq/QyVATHYWNj+F4rlz9O/SEtEoOfNTF3nsokGQdK3dRoDkt3WCOmWhg49gJO 1+GD0fQMISSPo8UgT0xpDTUVil/QD6ibd3kKe/HBGP076Q87mDq/LMApN9yx8LgjlYZ2 0cjXHKEZFWIjc0Ng447aZ2P2f2Wi3zgzHWOdKhd6KSqbc5DVZglp43CiSV4L571jlcVm 7sgg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:openpgp:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=WllZXI1zkPNtj7hUq79fLITy+6rZRMnfwbXQ3MGWqeA=; b=AW3q4f4eIiuHBeZxWJknYspBaCY7WxUnVtqfrozzTMEq8tjJUkSJIB9pwRSbY89wXS /CNBGUyijMKofG2uhucB7diUEQ5wZgBZUK6OHOr8qqYmSWMZ3LxtmfZfdvAXrAEMdqQQ CgyoI482rgnsxuR4C+2MU4+V0LrakA6ZtRC/2Dft4zX0svuHTJqrYR0DD2rjqxKVYHSj yUnGHIU9WIxghNeERoiv5jpCPpWJ9QJT1aueqix1oj5c63oOMLcR6+aj6/sM608deb59 OL2CcGsKhKUk3rzwz7k/d0KLX1Hwv3vf0+mkn5qRrR1Rttv8fUkBLU66D+FhprWXmBNb fCvQ== X-Gm-Message-State: AJcUukd5DgJ2yR3O+dk4MC1vwscYq1NaWvUlMP/rIlBU1gH+Meu5GX17 4WSTWKyiBXFtJXzvWenWXedRycdE3oQ= X-Google-Smtp-Source: ALg8bN5P23FwhHbxdu61nJdYpjC0qULV+lny85nQ9tUqGoKhJuWyDUkGuWo0cJjoLT5G/cDinGVumQ== X-Received: by 2002:a17:902:9f89:: with SMTP id g9mr3441602plq.214.1547549069704; Tue, 15 Jan 2019 02:44:29 -0800 (PST) Received: from [192.168.10.152] (124-171-140-5.dyn.iinet.net.au. [124.171.140.5]) by smtp.gmail.com with ESMTPSA id u126sm8984642pgb.2.2019.01.15.02.44.25 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 15 Jan 2019 02:44:29 -0800 (PST) Subject: Re: [PATCH] kbuild: mark prepare0 as PHONY to fix external module build To: Masahiro Yamada , linux-kbuild@vger.kernel.org Cc: Ard Biesheuvel , Samuel Holland , linuxppc-dev@lists.ozlabs.org, Michael Ellerman , "linux-stable # v4 . 20" , Michal Marek , linux-kernel@vger.kernel.org References: <1547536740-1572-1-git-send-email-yamada.masahiro@socionext.com> From: Alexey Kardashevskiy Openpgp: preference=signencrypt Autocrypt: addr=aik@ozlabs.ru; keydata= mQINBE+rT0sBEADFEI2UtPRsLLvnRf+tI9nA8T91+jDK3NLkqV+2DKHkTGPP5qzDZpRSH6mD EePO1JqpVuIow/wGud9xaPA5uvuVgRS1q7RU8otD+7VLDFzPRiRE4Jfr2CW89Ox6BF+q5ZPV /pS4v4G9eOrw1v09lEKHB9WtiBVhhxKK1LnUjPEH3ifkOkgW7jFfoYgTdtB3XaXVgYnNPDFo PTBYsJy+wr89XfyHr2Ev7BB3Xaf7qICXdBF8MEVY8t/UFsesg4wFWOuzCfqxFmKEaPDZlTuR 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c7E5M+/NpslPCmYnDjs5qg0/3ihh6XuOGggZQOqrYPC3PnsNs3NxirwOkVPQgO6mXxpuifvJ DG9EMkK8IBXnLulqVk54kf7fE0jT/d8RTtJIA92GzsgdK2rpT1MBKKVffjRFGwN7nQVOzi4T XrB5p+6ML7Bd84xOEGsj/vdaXmz1esuH7BOZAGEZfLRCHJ0GVCSssg== Message-ID: <54f84ad6-279f-aa64-8c2c-59becd64a6ad@ozlabs.ru> Date: Tue, 15 Jan 2019 21:44:22 +1100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <1547536740-1572-1-git-send-email-yamada.masahiro@socionext.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 15/01/2019 18:19, Masahiro Yamada wrote: > Commit c3ff2a5193fa ("powerpc/32: add stack protector support") > caused kernel panic on PowerPC if an external module is used with > CONFIG_STACKPROTECTOR because the 'prepare' target was not executed > for the external module build. > > Commit e07db28eea38 ("kbuild: fix single target build for external > module") turned it into a build error because the 'prepare' target is > now executed but the 'prepare0' target is missing for the external > module build. > > External module on arm/arm64 with CONFIG_STACKPROTECTOR_PER_TASK is > also broken in the same way. > > Move 'PHONY += prepare0' to the common place. Make is fine with missing > rule for phony targets. > > I minimize the change so it can be easily backported to 4.20.x > > To fix v4.20 for external modules of PowerPC, please backport > e07db28eea38 ("kbuild: fix single target build for external module"), > and then this commit. > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=201891 > Fixes: e07db28eea38 ("kbuild: fix single target build for external module") > Fixes: c3ff2a5193fa ("powerpc/32: add stack protector support") > Fixes: 189af4657186 ("ARM: smp: add support for per-task stack canaries") > Fixes: 0a1213fa7432 ("arm64: enable per-task stack canaries") > Cc: linux-stable # v4.20 > Reported-by: Samuel Holland > Reported-by: Alexey Kardashevskiy > Signed-off-by: Masahiro Yamada Tested-by: Alexey Kardashevskiy Thanks for fixing this! Out of curiosity - how does this work? arch/powerpc/Makefile's stack_protector_prepare still depends on prepare0 which is still defined only if KBUILD_EXTMOD=="" but somehow it does not bother ./Makefile? Thanks, > --- > > Makefile | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/Makefile b/Makefile > index 499b968..789b332 100644 > --- a/Makefile > +++ b/Makefile > @@ -955,6 +955,7 @@ ifdef CONFIG_STACK_VALIDATION > endif > endif > > +PHONY += prepare0 > > ifeq ($(KBUILD_EXTMOD),) > core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ > @@ -1061,8 +1062,7 @@ scripts: scripts_basic scripts_dtc > # archprepare is used in arch Makefiles and when processed asm symlink, > # version.h and scripts_basic is processed / created. > > -# Listed in dependency order > -PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 > +PHONY += prepare archprepare prepare1 prepare2 prepare3 > > # prepare3 is used to check if we are building in a separate output directory, > # and if so do: > -- Alexey