linux-kernel - [PATCH v5 0/7] Optimize jump label implementation for ARM64

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Date:	Fri, 18 Oct 2013 23:19:54 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>
Cc:	Jiang Liu <jiang.liu@...wei.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v5 0/7] Optimize jump label implementation for ARM64

From: Jiang Liu <jiang.liu@...wei.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", 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

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