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[2620:137:e000::1:18]) by mx.google.com with ESMTPS id h5-20020a056a001a4500b004fa72b5a626si9006143pfv.262.2022.03.21.14.43.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Mar 2022 14:43:42 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) client-ip=2620:137:e000::1:18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id E90C72A5A93; Mon, 21 Mar 2022 14:16:13 -0700 (PDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351379AbiCUQrY (ORCPT + 99 others); Mon, 21 Mar 2022 12:47:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59012 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243912AbiCUQrW (ORCPT ); Mon, 21 Mar 2022 12:47:22 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 65AEE6D38B; Mon, 21 Mar 2022 09:45:57 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 0E0A6B81822; Mon, 21 Mar 2022 16:45:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 084F6C340E8; Mon, 21 Mar 2022 16:45:52 +0000 (UTC) Date: Mon, 21 Mar 2022 12:45:51 -0400 From: Steven Rostedt To: Peter Zijlstra Cc: Stephen Rothwell , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Linux Kernel Mailing List , Linux Next Mailing List , mhiramat@kernel.org, ast@kernel.org, hjl.tools@gmail.com, rick.p.edgecombe@intel.com, rppt@kernel.org, linux-toolchains@vger.kernel.org, Andrew.Cooper3@citrix.com, ndesaulniers@google.com Subject: Re: linux-next: build warnings after merge of the tip tree Message-ID: <20220321124551.3d73660b@gandalf.local.home> In-Reply-To: References: <20220321140327.777f9554@canb.auug.org.au> <20220321112805.1393f9b9@gandalf.local.home> <20220321121209.3b95e406@gandalf.local.home> <20220321121549.1c8588c5@gandalf.local.home> X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RDNS_NONE, SPF_HELO_NONE,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 21 Mar 2022 17:40:32 +0100 Peter Zijlstra wrote: > func_B: > call __fentry__ /* push func_B */ > ... > call __fexit__ /* pop 1 + tails */ > ret > > func_A: > call __fentry__ /* push func_A */ > ... > call __ftail__ /* mark func_A tail */ > jmp func_B > > func_C: > call __fentry__ /* push func_C */ > call func_A; > ... > call __fexit__ /* pop 1 + tails */ > ret; This also assumes that we need to trace everything that is marked. I mentioned in another email, what do we do if we only trace funcA? -- Steve