From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932099AbeCIMfo (ORCPT ); Fri, 9 Mar 2018 07:35:44 -0500 Received: from mail.kernel.org ([198.145.29.99]:40820 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751070AbeCIMfn (ORCPT ); Fri, 9 Mar 2018 07:35:43 -0500 DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 19AB6206B2 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=mhiramat@kernel.org From: Masami Hiramatsu To: Thomas Gleixner , Ingo Molnar Cc: x86@kernel.org, Masami Hiramatsu , Yang Bo , Ingo Molnar , "H . Peter Anvin" , linux-kernel@vger.kernel.org, Ananth N Mavinakayanahalli , Andrew Morton , Steven Rostedt , Laura Abbott , Josef Bacik , Alexei Starovoitov Subject: [RFC PATCH -tip 0/9] kprobes: Cleanup jprobe implementation Date: Fri, 9 Mar 2018 21:35:17 +0900 Message-Id: <152059891712.4214.9539716544254881611.stgit@devbox> X-Mailer: git-send-email 2.13.6 User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, Since we decided to remove jprobe from kernel last year, its APIs are disabled and we worked on moving in-kernel jprobe users to kprobes or trace-events. And now no jprobe users are here anymore. I think it is good time to get rid of jprobe implementation from the kernel. However, I need other arch developers help to complete it, since jprobe is implemented multi arch wide. I can remove those code, but can not test all of those. Here is the series of patches to show how to do that. I tried to remove it from x86 tree. Basically we need to do 3 things; - Remove jprobe functions (register/unregister, setjump/longjump) from generic/arch-dependent code. [1/9][2/9][3/9] - Remove break_handler related code. [4/9][5/9][6/9] - Do not disable preemption on exception handler [7/9][8/9][9/9] The [3/9] and [6/9] are destractive changes except for x86 (means causes build errors) since those arch still have some references of those functions. So we need to write patches similar to [2/9] and [5/9] for each arch before applying those. In this series I sorted it as this order just for review, [3/9] and [6/9] should be applied after all archs have been fixed. Also, [7/9] is a kind of destractive, which changes required behavior for the pre_handlers which changes regs->ip. So we also need a patch similar to [7/9] for each arch too. Fortunately, current in-tree such user is very limited, both works only on x86. So it is not hurry, but we need to change arch dependent code. Thank you, --- Masami Hiramatsu (9): kprobes: Remove jprobe API implementation x86: kprobes: Remove jprobe implementation kprobes: Remove jprobe data structure and interfaces kprobes: Ignore break_handler x86: kprobes: Ignore break_handler kprobes: Remove break_handler from struct kprobe x86: kprobes: Do not disable preempt on int3 path error-injection: Fix to not enabling preemption in pre_handler tracing: kprobes: Fix to not enabling preemption Documentation/kprobes.txt | 13 ++-- arch/x86/include/asm/kprobes.h | 3 - arch/x86/kernel/kprobes/common.h | 10 --- arch/x86/kernel/kprobes/core.c | 114 ++------------------------------------ arch/x86/kernel/kprobes/ftrace.c | 21 +------ arch/x86/kernel/kprobes/opt.c | 1 include/linux/kprobes.h | 54 ------------------ kernel/fail_function.c | 1 kernel/kprobes.c | 115 ++------------------------------------ kernel/trace/trace_kprobe.c | 3 - 10 files changed, 20 insertions(+), 315 deletions(-) -- Masami Hiramatsu