linux-kernel - [PATCH RFC 05/10] riscv: kconfig: Add zve32x

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Message-Id: <20251210-profiles-v1-5-315a6ff2ca5a@gmail.com>
Date: Wed, 10 Dec 2025 08:13:42 -0800
From: Charlie Jenkins <charlie@...osinc.com>
To: Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, 
 Alexandre Ghiti <alex@...ti.fr>, Anup Patel <anup@...infault.org>, 
 Atish Patra <atish.patra@...ux.dev>, 
 Samuel Holland <samuel.holland@...ive.com>, 
 Björn Töpel <bjorn@...nel.org>, 
 Luke Nelson <luke.r.nels@...il.com>, Xi Wang <xi.wang@...il.com>, 
 Eric Biggers <ebiggers@...nel.org>, Conor Dooley <conor@...nel.org>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Charlie Jenkins <thecharlesjenkins@...il.com>
Subject: [PATCH RFC 05/10] riscv: kconfig: Add zve32x

Add zve32x since has_vector() checks for vector support by looking for
this extension.

Signed-off-by: Charlie Jenkins <thecharlesjenkins@...il.com>
---
 arch/riscv/Kconfig.extensions | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/riscv/Kconfig.extensions b/arch/riscv/Kconfig.extensions
index e3ca147765b1..e400fd5574f7 100644
--- a/arch/riscv/Kconfig.extensions
+++ b/arch/riscv/Kconfig.extensions
@@ -347,6 +347,7 @@ config RISCV_ISA_V
 	depends on TOOLCHAIN_HAS_V
 	depends on FPU
 	select DYNAMIC_SIGFRAME
+	select RISCV_ISA_ZVE32X
 	depends on NONPORTABLE || m
 	default m
 	help
@@ -359,6 +360,19 @@ config RISCV_ISA_V
 
 	  If you don't know what to do here, say m.
 
+config RISCV_ISA_ZVE32X
+	tristate "zve32x extension support"
+	depends on NONPORTABLE || m
+	default m
+	help
+	  zve23x is a subset of the vector extension. Can be enabled for minimal vector support.
+
+	  Select "m" for boot-time detection for portability.
+
+	  Select "y" for compile-time detection for optimization. Only available with NONPORTABLE.
+
+	  If you don't know what to do here, say m.
+
 config RISCV_ISA_V_DEFAULT_ENABLE
 	bool "Enable userspace Vector by default"
 	depends on RISCV_ISA_V

-- 
2.43.0