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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
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)"