linux-kernel - [PATCH 0/5] add support for relative references in jump tables

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Date:   Wed, 27 Jun 2018 18:05:59 +0200
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        x86@...nel.org
Cc:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Arnd Bergmann <arnd@...db.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 0/5] add support for relative references in jump tables

This series implements support for emitting the data structures associated
with jump tables as 32-bit relative references instead of absolute
references, which take up more space on builds that target 64-bit
architectures, or implement self relocation [or both].

This series enables it for arm64 and x86, although other architectures
might benefit as well.

Patch #1 does some preparatory refactoring before patch #2 introduces the
generic pieces required for using relative references.

Patch #3 wires everything up for arm64.

For x86, patch #4 applies some preparatory changes for the arch specific
jump label C code, which is a lot more involved than on arm64, which is
why it is split off in this case. Patch #5 wires it up for x86 as well.

Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will.deacon@....com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com> 
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Peter Zijlstra <peterz@...radead.org>

Ard Biesheuvel (5):
  kernel/jump_label: abstract jump_entry member accessors
  kernel/jump_label: implement generic support for relative references
  arm64/kernel: jump_label: switch to relative references
  x86: jump_label: switch to jump_entry accessors
  x86/kernel: jump_table: use relative references

 arch/Kconfig                        |  3 +
 arch/arm64/Kconfig                  |  1 +
 arch/arm64/include/asm/jump_label.h | 16 ++---
 arch/arm64/kernel/jump_label.c      |  6 +-
 arch/x86/Kconfig                    |  1 +
 arch/x86/include/asm/jump_label.h   | 28 +++------
 arch/x86/kernel/jump_label.c        | 43 +++++++------
 include/linux/jump_label.h          | 64 ++++++++++++++++++++
 kernel/jump_label.c                 | 56 ++++++++++-------
 tools/objtool/special.c             |  4 +-
 10 files changed, 145 insertions(+), 77 deletions(-)

-- 
2.11.0