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Commit 7bd99b40 authored by Will Deacon's avatar Will Deacon Committed by Catalin Marinas
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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: default avatarMark Rutland <mark.rutland@arm.com>
Acked-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 159fd7b8

arch/arm64/Kconfig

+3 −1
Original line number Diff line number Diff line
@@ -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)"