[PATCH v2 13/14] arm64/nmi: Add Kconfig for NMI

Mark Brown
2022-11-12T15:18:22Z

Since NMI handling is in some fairly hot paths we provide a Kconfig option
which allows support to be compiled out when not needed.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
arch/arm64/Kconfig | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 505c8a1ccbe0..dd987a9a4f81 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -2001,6 +2001,23 @@ config ARM64_EPAN
if the cpu does not implement the feature.
endmenu # "ARMv8.7 architectural features"

+menu "ARMv8.8 architectural features"
+
+config ARM64_NMI
+ bool "Enable support for Non-maskable Interrupts (NMI)"
+ default y
+ help
+ Non-maskable interrupts are an architecture and GIC feature
+ which allow the system to configure some interrupts to be
+ configured to have superpriority, allowing them to be handled
+ before other interrupts and masked for shorter periods of time.
+
+ The feature is detected at runtime, and will remain disabled
+ if the cpu does not implement the feature. It will also be
+ disabled if pseudo NMIs are enabled at runtime.
+
+endmenu # "ARMv8.8 architectural features"
+
config ARM64_SVE
bool "ARM Scalable Vector Extension support"
default y
--
2.30.2