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=-2.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, T_DKIMWL_WL_HIGH,USER_AGENT_MUTT 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 3A818C5ACC3 for ; Mon, 10 Jun 2019 14:21:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1107520862 for ; Mon, 10 Jun 2019 14:21:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560176510; bh=0q0JDs/XvjyzKVHfqOA4UDSjVijHYPYF7aTj5ganjQE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=VCwck6OMZTuxr8ST0E1+p6OYTusZUX3efqQ62gl7PHuRJY5AoYiSScKiHsqgDkfej kU477Rxhqjqh7mDTnGKZ/qKQNC706vd1uSRfas3iW/Qfvma61tW9z2c1y5ARylx2fE uPoDasTTkFUTtrh1RmW7uwZ2tI6liTcMfILs8QXc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2403835AbfFJOVt (ORCPT ); Mon, 10 Jun 2019 10:21:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:54118 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390708AbfFJOVs (ORCPT ); Mon, 10 Jun 2019 10:21:48 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3A7A3207E0; Mon, 10 Jun 2019 14:21:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560176507; bh=0q0JDs/XvjyzKVHfqOA4UDSjVijHYPYF7aTj5ganjQE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=bNq8D2lbEuW83CsAWd5W6/oi+NvDlAscZ02Tgb6/7mV7l1Sr2REukOrMx6YCsZK2R JfUG/cHSnwFgsJT0aKM892TIPiEcQOWiXWK1xSKK2bBl7N6lx9UKUyWuIRMx9DHQRy jNE02Fd+LQPntRoXDq5AKEUzdhaTkJm/RU2CNdI0= Date: Mon, 10 Jun 2019 16:21:45 +0200 From: Greg KH To: Ignat Korchagin Cc: Ivan Babrou , Arnaldo Carvalho de Melo , Miguel Ojeda , Peter Zijlstra , Josh Poimboeuf , Ingo Molnar , Alexander Shishkin , Jiri Olsa , Namhyung Kim , linux-kernel , Linux Kbuild mailing list , kernel-team Subject: Re: Linux 4.19 and GCC 9 Message-ID: <20190610142145.GC5937@kroah.com> References: <20190517073813.GB2589@hirez.programming.kicks-ass.net> <20190517085126.GA3249@kroah.com> <20190517152200.GI8945@kernel.org> <4FE2D490-F379-4CAE-9784-9BF81B7FE258@kernel.org> <20190610074510.GA24746@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.0 (2019-05-25) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jun 10, 2019 at 10:32:25AM +0100, Ignat Korchagin wrote: > Hi Greg, > > For us it seems applying the following 4 mainline patches makes 4.19.x > branch perf compile with GCC-9: > > 4d0f16d059ddb91424480d88473f7392f24aebdc: perf ui helpline: Use > strlcpy() as a shorter form of strncpy() + explicit set nul > b6313899f4ed2e76b8375cf8069556f5b94fbff0: perf help: Remove needless > use of strncpy() > 5192bde7d98c99f2cd80225649e3c2e7493722f7: perf header: Fix unchecked > usage of strncpy() > 97acec7df172cd1e450f81f5e293c0aa145a2797: perf data: Fix 'strncat may > truncate' build failure with recent gcc > > I also checked that 4.19.49 compiles fine with GCC 9, although with a > lot of warnings, mostly from objtool, like "warning: objtool: > sock_register()+0xd: sibling call from callable instruction with > modified stack frame". But it's a start. > > Can we apply the above-mentioned patches, please? I'll look into these after the next round of kernels are released. I guess I'll go find a distro that has gcc9 on it to actually test things... thanks, greg k-h