From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758072AbdJMNSp (ORCPT ); Fri, 13 Oct 2017 09:18:45 -0400 Received: from mx2.suse.de ([195.135.220.15]:52263 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753329AbdJMNSo (ORCPT ); Fri, 13 Oct 2017 09:18:44 -0400 Date: Fri, 13 Oct 2017 15:18:41 +0200 From: Torsten Duwe To: Ruslan Bilovol Cc: Li Bin , Jessica Yu , Miroslav Benes , zhouchengming , live-patching@vger.kernel.org, "linux-kernel@vger.kernel.org" , jpoimboe@redhat.com, jikos@kernel.org, pmladek@suse.com, Zefan Li , Hanjun Guo , rbilovol@cisco.com Subject: Re: [PATCH] reduce the time of finding symbols for module Message-ID: <20171013131841.en3yuwtl3wedei5t@suse.de> References: <1490666535-19192-1-git-send-email-zhouchengming1@huawei.com> <58DA41EE.90607@huawei.com> <20170329000333.zmafvp4uk34m3em6@jeyu> <65c261d0-1e83-8d29-899d-ec22e54a24a7@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: NeoMutt/20170421 (1.8.2) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Oct 13, 2017 at 03:54:46PM +0300, Ruslan Bilovol wrote: > Hi Li, > > On Wed, Mar 29, 2017 at 4:50 AM, Li Bin wrote: > > Hi, > [snip] > > > > Yeah, from 2014, we started to work on livepatch support on aarch64, and > > in May 2015, we pushed the solution to the livepatch community[1] and gcc > > community (mfentry feature on aarch64)[2]. And then, there were an another > > gcc solution from linaro [3], which proposes to implement a new option > > -fprolog-pad=N that generate a pad of N nops at the beginning of each > > function, and AFAIK, Torsten Duwe from SUSE is still discussing this method > > with gcc community. > > > > At this stage, we are validating the livepatch support on aarch64 based on > > aarch64 mfentry feature. When the community has a clear plan, we are happy > > to make adaptation and contribute our related work to the community, including > > the kpatch-build support :-) > > > > [1] livepatch: add support on arm64 > > https://lkml.org/lkml/2015/5/28/54 > > [2] [AArch64] support -mfentry feature for arm64 > > https://gcc.gnu.org/ml/gcc-patches/2016-03/msg00756.html > > [3] Kernel livepatching support in GCC > > https://gcc.gnu.org/ml/gcc/2015-05/msg00267.html > > [4] arm64: ftrace with regs for livepatch support > > http://lists.infradead.org/pipermail/linux-arm-kernel/2016-January/401352.html > > > > Since there is already -fpatchable-function-entry option committed by Torsten > to gcc on 25 Jul [1], have you restarted your activities with AArch64 livepatch > support? > If yes, I'm interested in testing of that feature/patches on our hardware I also have the coresponding kernel patch(es) here. IIRC I already sent tham to LKML. I'll re-send them once there are more gcc's with -fpatchable-function-entry support out there. Torsten