[PATCH v11 RESEND 4/9] arm64: Kconfig: Detect toolchain support for LSUI

Yeoreum Yun
2025-12-14T11:23:10Z

Since Armv9.6, FEAT_LSUI supplies the load/store instructions for
previleged level to access to access user memory without clearing
PSTATE.PAN bit.
It's enough to add CONFIG_AS_HAS_LSUI only because the code for LSUI uses
individual `.arch_extension` entries.

Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
---
arch/arm64/Kconfig | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 93173f0a09c7..36e87a1a1b5c 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -2227,6 +2227,11 @@ config ARM64_GCS

endmenu # "ARMv9.4 architectural features"

+config AS_HAS_LSUI
+ def_bool $(as-instr,.arch_extension lsui)
+ help
+ Supported by LLVM 20+ and binutils 2.45+.
+
config ARM64_SVE
bool "ARM Scalable Vector Extension support"
default y
--
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}