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[PATCH 08/27] arm64/sve: Kconfig update and conditional compilation support

This patch adds CONFIG_ARM64_SVE to control building of SVE support
into the kernel, and adds a stub predicate system_supports_sve() to
control conditional compilation and runtime SVE support.

system_supports_sve() just returns false for now: it will be
replaced with a non-trivial implementation in a later patch, once
SVE support is complete enough to be enabled safely.

Signed-off-by: Dave Martin <>
 arch/arm64/Kconfig                  | 11 +++++++++++
 arch/arm64/include/asm/cpufeature.h |  5 +++++
 2 files changed, 16 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index fdc302e..fbf7a5c 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -962,6 +962,17 @@ config ARM64_UAO
+config ARM64_SVE
+	bool "ARM Scalable Vector Extension support"
+	default y
+	help
+	  The Scalable Vector Extension (SVE) is an extension to the AArch64
+	  execution state which complements and extends the SIMD functionality
+	  of the base architecture to support much larger vectors and to enable
+	  additional vectorisation opportunities.
+	  To enable use of this extension on CPUs that implement it, say Y.
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index 428ee1f..4ea3441 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -262,6 +262,11 @@ static inline bool system_uses_ttbr0_pan(void)
+static inline bool system_supports_sve(void)
+	return false;
 #endif /* __ASSEMBLY__ */

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