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[209.132.180.67]) by mx.google.com with ESMTP id f19si4837518oos.45.2020.04.04.06.34.37; Sat, 04 Apr 2020 06:34:50 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=merlin.20170209 header.b=RQqJwzxb; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726327AbgDDNci (ORCPT + 99 others); Sat, 4 Apr 2020 09:32:38 -0400 Received: from merlin.infradead.org ([205.233.59.134]:41398 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726197AbgDDNci (ORCPT ); Sat, 4 Apr 2020 09:32:38 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; 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=sKdYVJdX3k84mHqdB1JfFeNgO6VOXjckqROOgUeE4T4=; b=RQqJwzxbWHaBvffTkFmFoeuIT9 0KZmodiErmNfv2LtfCUfDyJcjHkH4RfSOsoid7JlkKJUV5p4ScnNpXWzE3P5xzexAeQYc+FSYrS2i DSaqwcVupQPV7yMZHG1+CeA3Ub8qwESC4xifxPz4VkD6B8qd4j4cB5d4lWko4QUvEic+AOt5aA6yT tDfHhJssqVIlazOv4p2qEkzwn5mkkkcQFA36DiUq3ufECxfRLpzCDjNmpAxWGioYRN5qGXrar8Oxz SJFv2y3X3dK1HAUtSWuDomXCt2XKVh94H/Axybee9XKp9DtahS09PRNRHVkBHFJtBExlkop3QdpSy 7xaibUIA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jKiuM-0008Ff-Hf; Sat, 04 Apr 2020 13:32:22 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 0C0A9304D2B; Sat, 4 Apr 2020 15:32:19 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id EE02D2B1362DC; Sat, 4 Apr 2020 15:32:18 +0200 (CEST) Date: Sat, 4 Apr 2020 15:32:18 +0200 From: Peter Zijlstra To: Josh Poimboeuf Cc: Julien Thierry , Alexandre Chartre , x86@kernel.org, linux-kernel@vger.kernel.org, tglx@linutronix.de Subject: Re: [PATCH 4/7] objtool: Add support for return trampoline call Message-ID: <20200404133218.GL20760@hirez.programming.kicks-ass.net> References: <20200402082220.808-1-alexandre.chartre@oracle.com> <20200402082220.808-5-alexandre.chartre@oracle.com> <20200402154022.GG20730@hirez.programming.kicks-ass.net> <20200403151757.lhhia7pzqptvlqz5@treble> <20200403154620.GS20730@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200403154620.GS20730@hirez.programming.kicks-ass.net> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Apr 03, 2020 at 05:46:20PM +0200, Peter Zijlstra wrote: > On Fri, Apr 03, 2020 at 10:17:57AM -0500, Josh Poimboeuf wrote: > > Peter, I think my previous idea for UNWIND_HINT_ADJUST stack_add=8 would > > work here? > > Yes, it would. Sorry, I have reconsidered. While it will shut up objtool, it will not 'work'. That is, the ORC data generated will not correctly unwind. I'll try and write a longer email tonight.