linux-kernel - [PATCH 0/2] arm64: Use static keys for CPU features

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Date:   Thu, 25 Aug 2016 18:26:30 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Will Deacon <will.deacon@....com>,
        Suzuki.Poulose@....com
Subject: [PATCH 0/2] arm64: Use static keys for CPU features

This series is aimed to optimise the arm64 cpus_have_cap() functionality
(checking for the presence of certain CPU capabilities/features) to
avoid a bitmap test and use a jump label instead, patched at boot time.

While this series may not provide a clear performance improvement with
the current kernel, it will be more beneficial with new features like
TTBR0 PAN are which are used on hot paths (get_user/put_user, thread
switching).

Catalin Marinas (2):
  jump_labels: Allow array initialisers
  arm64: Use static keys for CPU features

 Documentation/static-keys.txt       |  8 ++++++++
 arch/arm64/include/asm/cpufeature.h | 14 +++++++++++---
 arch/arm64/kernel/cpufeature.c      |  3 +++
 arch/arm64/kernel/cpuinfo.c         |  6 ++++++
 include/linux/jump_label.h          | 12 ++++++++++++
 5 files changed, 40 insertions(+), 3 deletions(-)