Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758628AbaKUPVn (ORCPT ); Fri, 21 Nov 2014 10:21:43 -0500 Received: from mx1.redhat.com ([209.132.183.28]:39108 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755396AbaKUPVl (ORCPT ); Fri, 21 Nov 2014 10:21:41 -0500 Date: Fri, 21 Nov 2014 09:21:03 -0600 From: Josh Poimboeuf To: Jiri Kosina Cc: Seth Jennings , Vojtech Pavlik , Steven Rostedt , Petr Mladek , Miroslav Benes , Christoph Hellwig , Greg KH , Andy Lutomirski , Masami Hiramatsu , live-patching@vger.kernel.org, x86@kernel.org, kpatch@redhat.com, linux-kernel@vger.kernel.org Subject: Re: [PATCHv3 2/3] kernel: add support for live patching Message-ID: <20141121152103.GB26264@treble.redhat.com> References: <1416522580-5593-1-git-send-email-sjenning@redhat.com> <1416522580-5593-3-git-send-email-sjenning@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23.1-rc1 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Nov 21, 2014 at 01:22:33AM +0100, Jiri Kosina wrote: > On Thu, 20 Nov 2014, Seth Jennings wrote: > > --- /dev/null > > +++ b/kernel/livepatch/Kconfig > > @@ -0,0 +1,18 @@ > > +config ARCH_HAVE_LIVE_PATCHING > > + boolean > > + help > > + Arch supports kernel live patching > > + > > +config LIVE_PATCHING > > + boolean "Kernel Live Patching" > > + depends on DYNAMIC_FTRACE_WITH_REGS > > + depends on MODULES > > + depends on SYSFS > > + depends on KALLSYMS_ALL > > + depends on ARCH_HAVE_LIVE_PATCHING > > We have to refuse to build on x86_64 if the compiler doesn't support > fentry. mcount is not really usable (well, it would be possible to use it, > be the obstacles are too big to care). > > Something like [1] should be applicable here as well I believe. > > [1] https://git.kernel.org/cgit/linux/kernel/git/jirislaby/kgraft.git/commit/?h=kgraft&id=bd4bc097c72937d18036f1312a4d79ed0bea9991 I think we can use "depends on HAVE_FENTRY" to accomplish this, since CC_USING_FENTRY gets set by the top level kernel Makefile if CONFIG_HAVE_FENTRY is set. -- Josh -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/