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 Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 54E45C021A6 for ; Mon, 24 Feb 2025 12:35:59 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4Z1gFT6ktlz2ypP; Mon, 24 Feb 2025 23:35:57 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip="2001:8b0:10b:1:d65d:64ff:fe57:4e05" ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1740400557; cv=none; b=iDxILF1mYKxWyhNplTnuS87uiZlz330I3HW0Lrun2laTUTVulM822ex9ocL6N+gG9PQshyQkBXNiyVMksK3SEccn7JmqapxAMCYKWOuBe1Pgiw7theVaLeORlo/diUKCqqr88TNVW/ThzjBCcJ2oDOVmhzKjfixCIEB9gSI9RZSuz9LipFl+1s4GaQG2ymljib0GCG53NVICgX8WGB0uNXaQySiIonsKsYgKh6+S5xiTRKkb6kkj3oS7iDkwy5HmHjY+GChxbMHRixK0I5eeNZkMZlE4HByrX6wbFu2ct6dIutgOj30A2u+A8nSlXzsgk1R1kcC3ZYlMK+2JHarnSw== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1740400557; c=relaxed/relaxed; bh=KjNIYWV63wd2ETJVPJjYoHVaRj09KcDEXGN6j/BKYZs=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=UUSW5lzr54p4qi/OT2nkzQBJzKwWgE1Hlc+96bSiOa+aRx8SiWbRPNv3sIe49D0Hn0ACJ21dfUCboOjWiEAaMKiURos1UerXbESh37Amxd2hIzDTWO9fVfESQtJrvlbg39f4ZRsWTvlgHtyK/PaeXC6kbgrUfgJ5K645AQnHgHBuxWaK3H1Cw97u1YDOX3wz6oqjmEcP//pbsYUZn+Ch4OzJ7M/GJOtXAo7oSEsnY5nuyfo08VKCgWQyBAvdo4zas9g0tzgz3E/Uox4uMAixixAqdum/o7e1DkFnWSwEFf/fWx5YOZD0WZ/JYKPQCCujQZiKUQgH19NyM+G4b8Whaw== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none (client-ip=2001:8b0:10b:1:d65d:64ff:fe57:4e05; helo=desiato.infradead.org; envelope-from=peterz@infradead.org; receiver=lists.ozlabs.org) smtp.mailfrom=infradead.org Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: lists.ozlabs.org; spf=none (no SPF record) smtp.mailfrom=infradead.org (client-ip=2001:8b0:10b:1:d65d:64ff:fe57:4e05; helo=desiato.infradead.org; envelope-from=peterz@infradead.org; receiver=lists.ozlabs.org) Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4Z1gFL5ZBXz2yRM for ; Mon, 24 Feb 2025 23:35:50 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=KjNIYWV63wd2ETJVPJjYoHVaRj09KcDEXGN6j/BKYZs=; b=CiPkSzWklbhO7mPKl1Jriapzi/ h9ZxgOOaJCqDCX7rY6o0B7nUEflSjApS0qhasUcWF4BOkhJEwhaYfuv99XToeUmJQw2+kR6W5WrhW OwHnhVNyz53GmSNgcjiXOMIlxaXMZ0jwdb4zAwnzMZ4zeug+JEniisIxMNgEmiqKuCkxUOCf72gjQ oTHbKpc43qi+xEsISsUdjmrcR0JdWeEOh3E9X9GVJYKXcwRew5f16ANwoYvi3KnMMjz5NxnyR5eZs Kaqfcp2voEqtm9ZcyMIA26TvS5hyeuZL36CiNSnC/JxZQm22QlYAxSDZQwcmduj7p2AXViJBxosAl /Ur+1niw==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tmXgO-00000003Bsx-0elI; Mon, 24 Feb 2025 12:35:36 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id B45A4300164; Mon, 24 Feb 2025 13:35:34 +0100 (CET) Date: Mon, 24 Feb 2025 13:35:34 +0100 From: Peter Zijlstra To: Sathvika Vasireddy Cc: Josh Poimboeuf , christophe.leroy@csgroup.eu, npiggin@gmail.com, maddy@linux.ibm.com, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, llvm@lists.linux.dev Subject: Re: [RFC PATCH] objtool: Skip unannotated intra-function call warning for bl+mflr pattern Message-ID: <20250224123534.GB17456@noisy.programming.kicks-ass.net> References: <20250219162014.10334-1-sv@linux.ibm.com> <20250220195940.ely2l2fpsozd2tuv@jpoimboe> <4bea75bc-d3f6-4972-b644-f9b5a4e8bb77@linux.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4bea75bc-d3f6-4972-b644-f9b5a4e8bb77@linux.ibm.com> On Fri, Feb 21, 2025 at 02:20:41PM +0530, Sathvika Vasireddy wrote: > Also, just out of curiosity, how does x86 do it? Does it not use a branch to > next instruction approach? x86_64 can use LEA like: #define _THIS_IP_ ({ unsigned long __here; asm ("lea 0(%%rip), %0" : "=r" (__here)); __here; }) 32bit needs to call a function, read the stack value and return.