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_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,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 B01DDC43219 for ; Wed, 1 May 2019 19:42:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7BE1920866 for ; Wed, 1 May 2019 19:42:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="ozn4OG8V" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726144AbfEATmG (ORCPT ); Wed, 1 May 2019 15:42:06 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:42674 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726004AbfEATmF (ORCPT ); Wed, 1 May 2019 15:42:05 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.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:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=7oA8gHDb7woGBm64YcjtkTyUbS99LN6SL9zg9DEkjCw=; b=ozn4OG8VcRRrICVNR0eS1eU+2 baR6SDPRSEH135PXPPoEvbdaM5sBGAYfLLFQTpUJXys0lubT8V7DE+UleyMbVXonD4BnmUghFS18X +f6vCUPCqD+6tAQViFEb93ChGc+IT1BEkBPJz+6eejTY7ghNeXBTP4DOZnfC1ytFHXQD5nd5GFJme DxWaxstHlwX28VzbXhkRrjsbTnOqXQrWPtKr+vJz5I2sWkK6aGl2m4MFvKTVQEHErHTAiETMJuDx+ bfPAVpYsp16c7r7aeqfbiv/T9Z8jyzc9X5w3PBYo7VOrzkdWkuNFY0wb8WVYOhRPp4QAPC18sUsDC dL5yKHd3Q==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=worktop.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1hLv6k-0000iv-RV; Wed, 01 May 2019 19:41:35 +0000 Received: by worktop.programming.kicks-ass.net (Postfix, from userid 1000) id 578D7984EB4; Wed, 1 May 2019 21:41:32 +0200 (CEST) Date: Wed, 1 May 2019 21:41:32 +0200 From: Peter Zijlstra To: Jiri Kosina Cc: Steven Rostedt , Linus Torvalds , Andy Lutomirski , Nicolai Stange , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , the arch/x86 maintainers , Josh Poimboeuf , Miroslav Benes , Petr Mladek , Joe Lawrence , Shuah Khan , Konrad Rzeszutek Wilk , Tim Chen , Sebastian Andrzej Siewior , Mimi Zohar , Juergen Gross , Nick Desaulniers , Nayna Jain , Masahiro Yamada , Joerg Roedel , Linux List Kernel Mailing , live-patching@vger.kernel.org, "open list:KERNEL SELFTEST FRAMEWORK" Subject: Re: [RFC][PATCH] ftrace/x86: Emulate call function while updating in breakpoint handler Message-ID: <20190501194132.GX7905@worktop.programming.kicks-ass.net> References: <20190430130359.330e895b@gandalf.local.home> <20190430132024.0f03f5b8@gandalf.local.home> <20190430134913.4e29ce72@gandalf.local.home> <20190501131117.GW2623@hirez.programming.kicks-ass.net> <20190501151330.023cc620@gandalf.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 01, 2019 at 09:33:28PM +0200, Jiri Kosina wrote: > On Wed, 1 May 2019, Steven Rostedt wrote: > > > I never tested the 32 bit version of this. And we could just not > > implement it (I don't think there's live kernel patching for it > > either). > > That's correct, there is no livepatching on x86_32 (and no plans for > it). CONFIG_LIVEPATCH is not available for 32bit builds at all. We still want this for static_call(), even on 32bit.