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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 CD88FC3A5A6 for ; Mon, 26 Aug 2019 15:11:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9B3A620828 for ; Mon, 26 Aug 2019 15:11:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1566832297; bh=+3wHUCLAJU9VcfWi1FrlZA64sXlEodgwHT/8Q/mtsjI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=bo7nIJce1Vs2S1tjpRcmjJ4ELtDsGpHdKv1Pmz6S2bYG/rODs/NaLD9LlXeDFnCvw jk9zCn6C6cf+upN+uGKjQtBrK1tuxk7KkHC02SWz1iO3V7MdJ0asq/dWz0aYSMpLrZ VXJ2yWPV0d2qX7c2kwum9u2iKDPv2MKBSe9ahX2Q= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732886AbfHZPLd (ORCPT ); Mon, 26 Aug 2019 11:11:33 -0400 Received: from mail.kernel.org ([198.145.29.99]:59624 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727658AbfHZPLd (ORCPT ); Mon, 26 Aug 2019 11:11:33 -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 0CC7F2080C; Mon, 26 Aug 2019 15:11:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1566832292; bh=+3wHUCLAJU9VcfWi1FrlZA64sXlEodgwHT/8Q/mtsjI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=OR4jEIiCGSjOeQ7p3D0b1a599hT5n5AXwsjSsd+L5p70ViHopNwSqtaDPjLPFcnje jPHj2tyExewzG7UQc6AoxoWeXV7E3TwIMQpaebUlf9XcakOvgkVAvgCz22YHxrm7DA i/mEEJD2gr0fxIM0iS3/kCd8nFfpGuIZ0K+CIp4M= Date: Mon, 26 Aug 2019 17:11:29 +0200 From: Greg KH To: He Zhe Cc: ast@kernel.org, daniel@iogearbox.net, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, ndesaulniers@google.com, miguel.ojeda.sandonis@gmail.com, luc.vanoostenryck@gmail.com, schwidefsky@de.ibm.com, mst@redhat.com, gor@linux.ibm.com, andreyknvl@google.com, jpoimboe@redhat.com, liuxiaozhou@bytedance.com, yamada.masahiro@socionext.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org Subject: Re: kernel/bpf/core.o: warning: objtool: ___bpf_prog_run.cold()+0x7: call without frame pointer save/setup Message-ID: <20190826151129.GA21679@kroah.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Mon, Aug 26, 2019 at 10:42:53PM +0800, He Zhe wrote: > Hi All, > > Since 3193c0836f20 ("bpf: Disable GCC -fgcse optimization for ___bpf_prog_run()"), > We have got the following warning, > kernel/bpf/core.o: warning: objtool: ___bpf_prog_run.cold()+0x7: call without frame pointer save/setup > > If reverting the above commit, we will get the following warning, > kernel/bpf/core.o: warning: objtool: ___bpf_prog_run()+0x8b9: sibling call from callable instruction with modified stack frame > if CONFIG_RETPOLINE=n, and no warning if CONFIG_RETPOLINE=y Do you see this same problem on 5.3-rc6? And what version of gcc are you using? thanks, greg k-h