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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>
This commit is contained in:
Will Deacon 2018-05-21 19:14:22 +01:00 committed by Catalin Marinas
parent 159fd7b8d3
commit 7bd99b4034
1 changed files with 3 additions and 1 deletions
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arch/arm64/Kconfig
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@ -1051,6 +1051,7 @@ config ARM64_PAN
config ARM64_LSE_ATOMICS config ARM64_LSE_ATOMICS
bool "Atomic instructions" bool "Atomic instructions"
default y
help help
As part of the Large System Extensions, ARMv8.1 introduces new As part of the Large System Extensions, ARMv8.1 introduces new
atomic instructions that are designed specifically to scale in 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 Say Y here to make use of these instructions for the in-kernel
atomic routines. This incurs a small overhead on CPUs that do atomic routines. This incurs a small overhead on CPUs that do
not support these instructions and requires the kernel to be 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 config ARM64_VHE
bool "Enable support for Virtualization Host Extensions (VHE)" bool "Enable support for Virtualization Host Extensions (VHE)"