From: liuj97@gmail.com (Jiang Liu)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 0/7] Optimize jump label implementation for ARM64
Date: Wed, 16 Oct 2013 11:18:05 +0800 [thread overview]
Message-ID: <1381893492-7135-1-git-send-email-liuj97@gmail.com> (raw)
From: Jiang Liu <jiang.liu@huawei.com>
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 and a real hardware platform.
Any comments are welcomed!
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 | 79 ++++++++++
arch/arm64/include/asm/jump_label.h | 52 +++++++
arch/arm64/kernel/Makefile | 3 +-
arch/arm64/kernel/insn.c | 285 ++++++++++++++++++++++++++++++++++++
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, 522 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
next reply other threads:[~2013-10-16 3:18 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-16 3:18 Jiang Liu [this message]
2013-10-16 3:18 ` [PATCH v3 1/7] arm64: introduce basic aarch64 instruction decoding helpers Jiang Liu
2013-10-16 10:51 ` Will Deacon
2013-10-16 15:36 ` Jiang Liu
2013-10-16 17:14 ` Jiang Liu
2013-10-17 9:43 ` Will Deacon
2013-10-16 3:18 ` [PATCH v3 2/7] arm64: introduce interfaces to hotpatch kernel and module code Jiang Liu
2013-10-16 11:11 ` Will Deacon
2013-10-16 16:15 ` Jiang Liu
2013-10-16 3:18 ` [PATCH v3 3/7] arm64: move encode_insn_immediate() from module.c to insn.c Jiang Liu
2013-10-16 11:22 ` Will Deacon
2013-10-16 16:33 ` Jiang Liu
2013-10-16 3:18 ` [PATCH v3 4/7] arm64: introduce aarch64_insn_gen_{nop|branch_imm}() helper functions Jiang Liu
2013-10-16 3:18 ` [PATCH v3 5/7] arm64, jump label: detect %c support for ARM64 Jiang Liu
2013-10-16 3:18 ` [PATCH v3 6/7] arm64, jump label: optimize jump label implementation Jiang Liu
2013-10-16 11:46 ` Will Deacon
2013-10-16 17:11 ` Jiang Liu
2013-10-17 9:39 ` Will Deacon
2013-10-17 14:40 ` Jiang Liu
2013-10-17 15:27 ` Steven Rostedt
2013-10-18 3:31 ` Jiang Liu (Gerry)
2013-10-18 10:02 ` Will Deacon
2013-10-16 3:18 ` [PATCH v3 7/7] jump_label: use defined macros instead of hard-coding for better readability Jiang Liu
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