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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT 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 19AF3C43387 for ; Wed, 19 Dec 2018 14:17:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E7D9B218D0 for ; Wed, 19 Dec 2018 14:17:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729318AbeLSORw (ORCPT ); Wed, 19 Dec 2018 09:17:52 -0500 Received: from mx2.suse.de ([195.135.220.15]:41298 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728426AbeLSORw (ORCPT ); Wed, 19 Dec 2018 09:17:52 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 40BD2AD6F; Wed, 19 Dec 2018 14:17:50 +0000 (UTC) From: Miroslav Benes To: yamada.masahiro@socionext.com, michal.lkml@markovi.net, jpoimboe@redhat.com, jeyu@kernel.org, jikos@kernel.org Cc: pmladek@suse.com, linux-kbuild@vger.kernel.org, live-patching@vger.kernel.org, linux-kernel@vger.kernel.org, Miroslav Benes Subject: [PATCH] kbuild: use -flive-patching when CONFIG_LIVEPATCH is enabled Date: Wed, 19 Dec 2018 15:17:44 +0100 Message-Id: <20181219141744.32392-1-mbenes@suse.cz> X-Mailer: git-send-email 2.19.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org GCC 9 introduces a new option, -flive-patching. It disables certain optimizations which could make a compilation unsafe for later live patching of the running kernel. The option is used only if CONFIG_LIVEPATCH is enabled and $(CC) supports it. Signed-off-by: Miroslav Benes --- Makefile | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Makefile b/Makefile index a0650bf79606..53f5ab810efe 100644 --- a/Makefile +++ b/Makefile @@ -778,6 +778,10 @@ KBUILD_CFLAGS_KERNEL += $(call cc-option,-ffunction-sections,) KBUILD_CFLAGS_KERNEL += $(call cc-option,-fdata-sections,) endif +ifdef CONFIG_LIVEPATCH +KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone) +endif + # arch Makefile may override CC so keep this after arch Makefile is included NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) -- 2.19.2