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| author | Will Deacon <will.deacon@arm.com> | 2018-05-21 20:14:22 +0200 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2018-05-23 12:33:45 +0200 |
| commit | 7bd99b403405d329b9b72f6bae6a07c10bfa1b95 (patch) | |
| tree | ee1195ab483e0d8e9c27f46af1d325b051c511e1 /arch/arm64/Kconfig | |
| parent | arm64/sve: Write ZCR_EL1 on context switch only if changed (diff) | |
| download | linux-7bd99b403405d329b9b72f6bae6a07c10bfa1b95.tar.xz linux-7bd99b403405d329b9b72f6bae6a07c10bfa1b95.zip | |
arm64: Kconfig: Enable LSE atomics by default
Now that we're seeing CPUs shipping with LSE atomics, default them to
'on' in Kconfig. CPUs without the instructions will continue to use
LDXR/STXR-based sequences, but they will be placed out-of-line by the
compiler.
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 4d98774cf3c7..3aed13626fd7 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1051,6 +1051,7 @@ config ARM64_PAN config ARM64_LSE_ATOMICS bool "Atomic instructions" + default y help As part of the Large System Extensions, ARMv8.1 introduces new atomic instructions that are designed specifically to scale in @@ -1059,7 +1060,8 @@ config ARM64_LSE_ATOMICS Say Y here to make use of these instructions for the in-kernel atomic routines. This incurs a small overhead on CPUs that do not support these instructions and requires the kernel to be - built with binutils >= 2.25. + built with binutils >= 2.25 in order for the new instructions + to be used. config ARM64_VHE bool "Enable support for Virtualization Host Extensions (VHE)" |