Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751455AbaAGOUG (ORCPT ); Tue, 7 Jan 2014 09:20:06 -0500 Received: from mail-pd0-f182.google.com ([209.85.192.182]:54066 "EHLO mail-pd0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750817AbaAGOUC (ORCPT ); Tue, 7 Jan 2014 09:20:02 -0500 From: Jiang Liu To: Steven Rostedt , Catalin Marinas , Will Deacon , Sandeepa Prabhu , AKASHI Takahiro Cc: Jiang Liu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v8 0/7] Optimize jump label implementation for ARM64 Date: Tue, 7 Jan 2014 22:17:07 +0800 Message-Id: <1389104234-15239-1-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 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. It has been tested on ARM Fast mode and a real hardware platform. V7->V8: 1) Minor syntax fix 2) include into to avoid duplicated definitions V6->V7: 1) Minor format clean up 2) Remove smp_mb() pair V5->V6: 1) optimize stop_machine() related code 2) simplify aarch64_insn_patch_text_nosync() interface 3) refine comments V4->V5: 1) rework the stop_machine() related code 2) rework aarch64_insn_gen_nop() V3->V4: 1) resolve a race condition in kernel text patching 2) address other review comments V2->V3: 1) fix a bug in comparing signed and unsigned values 2) detect big endian by checking __AARCH64EB__ 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 | 108 +++++++++++++ arch/arm64/include/asm/jump_label.h | 52 ++++++ arch/arm64/kernel/Makefile | 3 +- arch/arm64/kernel/insn.c | 304 ++++++++++++++++++++++++++++++++++++ arch/arm64/kernel/jump_label.c | 58 +++++++ arch/arm64/kernel/module.c | 157 ++++++------------- include/linux/jump_label.h | 19 ++- scripts/gcc-goto.sh | 2 +- 9 files changed, 585 insertions(+), 119 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/