From mboxrd@z Thu Jan 1 00:00:00 1970 From: liuj97@gmail.com (Jiang Liu) Date: Fri, 18 Oct 2013 23:19:54 +0800 Subject: [PATCH v5 0/7] Optimize jump label implementation for ARM64 Message-ID: <1382109602-27432-1-git-send-email-liuj97@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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", and there's a patch for it now: http://gcc.gnu.org/ml/gcc-patches/2013-10/msg01314.html It has been tested on ARM Fast mode and a real hardware platform. Any comments are welcomed! 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 | 121 +++++++++++++++++ arch/arm64/include/asm/jump_label.h | 52 +++++++ arch/arm64/kernel/Makefile | 3 +- arch/arm64/kernel/insn.c | 263 ++++++++++++++++++++++++++++++++++++ arch/arm64/kernel/jump_label.c | 58 ++++++++ arch/arm64/kernel/module.c | 153 +++++++-------------- include/linux/jump_label.h | 15 +- scripts/gcc-goto.sh | 2 +- 9 files changed, 554 insertions(+), 114 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