Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754327Ab3JMOuo (ORCPT ); Sun, 13 Oct 2013 10:50:44 -0400 Received: from mail-pa0-f52.google.com ([209.85.220.52]:54131 "EHLO mail-pa0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753550Ab3JMOun (ORCPT ); Sun, 13 Oct 2013 10:50:43 -0400 From: Jiang Liu To: Steven Rostedt , Catalin Marinas , Will Deacon , Sandeepa Prabhu Cc: Jiang Liu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 0/7] Optimize jump label implementation on ARM64 Date: Sun, 13 Oct 2013 22:50:20 +0800 Message-Id: <1381675827-1610-1-git-send-email-liuj97@gmail.com> X-Mailer: git-send-email 1.8.1.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2247 Lines: 54 From: Jiang Liu This patchset tries to optimize arch specfic jump label implementation for ARM64 by dynamic kernel text patching. To enable this feature, your toolchain must support "asm goto" extension and "%c" constraint extesion. Current GCC for AARCH64 doesn't support "%c", so you need a GCC patch similiar to this: http://gcc.gnu.org/viewcvs/gcc/trunk/gcc/config/arm/arm.c?view=patch&r1=175293&r2=175565&pathrev=175565 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48637 It has been tested on ARM Fast mode, but not on real hardware yet. Any comments are welcomed! V1->V2: address review comments of V1 1) refine comments 2) add a new interface to always synchronize with stop_machine() when patching code 3) handle endian issue when patching code Jiang Liu (7): arm64: introduce basic aarch64 instruction decoding helpers arm64: introduce interfaces to hotpatch kernel and module code arm64: move encode_insn_immediate() from module.c to insn.c arm64: introduce aarch64_insn_gen_{nop|branch_imm}() helper functions arm64, jump label: detect %c support for ARM64 arm64, jump label: optimize jump label implementation jump_label: use defined macros instead of hard-coding for better readability arch/arm64/Kconfig | 1 + arch/arm64/include/asm/insn.h | 79 ++++++++++ arch/arm64/include/asm/jump_label.h | 52 +++++++ arch/arm64/kernel/Makefile | 3 +- arch/arm64/kernel/insn.c | 290 ++++++++++++++++++++++++++++++++++++ arch/arm64/kernel/jump_label.c | 60 ++++++++ arch/arm64/kernel/module.c | 151 ++++--------------- include/linux/jump_label.h | 15 +- scripts/gcc-goto.sh | 2 +- 9 files changed, 527 insertions(+), 126 deletions(-) create mode 100644 arch/arm64/include/asm/insn.h create mode 100644 arch/arm64/include/asm/jump_label.h create mode 100644 arch/arm64/kernel/insn.c create mode 100644 arch/arm64/kernel/jump_label.c -- 1.8.1.2 -- 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/