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=-5.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_2 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 C4668C43461 for ; Thu, 10 Sep 2020 09:27:07 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 54C0421556 for ; Thu, 10 Sep 2020 09:27:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="m5t5Zq/z" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 54C0421556 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Type:Cc: List-Subscribe:List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: Mime-Version:References:In-Reply-To:Date:To:From:Subject:Message-ID:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Jtk4s80ZjYa+wzFyVtPAmwHPkolLCANwHpXFaEm4i1o=; b=m5t5Zq/z02TXUSL/VlJag9iRo gfBrfwVINdgw8EiUsno4nnJU6Qz2ijmFrp4DVhtfrVP4NBQJISj+Ka6swnUHHDoRW667YYaVtve2g ArgjyOKTj2V3RwsFZdJ7RCekU76QHHxoLlJ/7yJ4Ijt4CxFiKr8LKhqKyzx55uMBN4x3RYc9/okLu FnRWymEeNva27PQclSxO3S3BzP+8jOj+MKTldcXegsxKGlxp8qwzFqtma7D0kdctAyhQRYEyDVg/2 so7xmGKIIh53uPNL1RSo2rKPw7j3s990/KnkXJGVtXio02NaJJ4t34wJyUU2yimsE+9bypMNJCXqv +3m/4Rxgg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kGIpv-00076i-Rt; Thu, 10 Sep 2020 09:25:47 +0000 Received: from 54-240-197-231.amazon.com ([54.240.197.231] helo=freeip.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kGIps-00074k-9e; Thu, 10 Sep 2020 09:25:44 +0000 Message-ID: <5f45f55340cf54f5506a50adf61e49b27b904322.camel@infradead.org> Subject: Re: [PATCH v2 15/28] init: lto: ensure initcall ordering From: David Woodhouse To: Sami Tolvanen , Masahiro Yamada , Will Deacon Date: Thu, 10 Sep 2020 10:25:40 +0100 In-Reply-To: <20200903203053.3411268-16-samitolvanen@google.com> References: <20200624203200.78870-1-samitolvanen@google.com> <20200903203053.3411268-1-samitolvanen@google.com> <20200903203053.3411268-16-samitolvanen@google.com> X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, x86@kernel.org, Kees Cook , "Paul E. McKenney" , kernel-hardening@lists.openwall.com, Peter Zijlstra , Greg Kroah-Hartman , linux-kbuild@vger.kernel.org, Nick Desaulniers , linux-kernel@vger.kernel.org, Steven Rostedt , clang-built-linux@googlegroups.com, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: multipart/mixed; boundary="===============5703379803110907578==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============5703379803110907578== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-azSh1km8wLbP7TG6+Llw" --=-azSh1km8wLbP7TG6+Llw Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2020-09-03 at 13:30 -0700, Sami Tolvanen wrote: > With LTO, the compiler doesn't necessarily obey the link order for > initcalls, and initcall variables need globally unique names to avoid > collisions at link time. >=20 > This change exports __KBUILD_MODNAME and adds the initcall_id() macro, > which uses it together with __COUNTER__ and __LINE__ to help ensure > these variables have unique names, and moves each variable to its own > section when LTO is enabled, so the correct order can be specified using > a linker script. >=20 > The generate_initcall_ordering.pl script uses nm to find initcalls from > the object files passed to the linker, and generates a linker script > that specifies the intended order. With LTO, the script is called in > link-vmlinux.sh. Is this guaranteed to give you the *same* initcall ordering with LTO as without? --=-azSh1km8wLbP7TG6+Llw Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 OTU5WjAkMSIwIAYJKoZIhvcNAQkBFhNkd213MkBpbmZyYWRlYWQub3JnMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAsv3wObLTCbUA7GJqKj9vHGf+Fa+tpkO+ZRVve9EpNsMsfXhvFpb8 RgL8vD+L133wK6csYoDU7zKiAo92FMUWaY1Hy6HqvVr9oevfTV3xhB5rQO1RHJoAfkvhy+wpjo7Q cXuzkOpibq2YurVStHAiGqAOMGMXhcVGqPuGhcVcVzVUjsvEzAV9Po9K2rpZ52FE4rDkpDK1pBK+ 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