linux-kernel - [RFC PATCH v8 05/21] riscv: Add vector feature to compile

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Message-Id: <3bf5002402f4aad88daf11e223ec40ef195fe308.1631121222.git.greentime.hu@sifive.com>
Date:   Thu,  9 Sep 2021 01:45:17 +0800
From:   Greentime Hu <greentime.hu@...ive.com>
To:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        aou@...s.berkeley.edu, palmer@...belt.com,
        paul.walmsley@...ive.com, vincent.chen@...ive.com
Subject: [RFC PATCH v8 05/21] riscv: Add vector feature to compile

From: Guo Ren <guoren@...ux.alibaba.com>

This patch adds a new config option which could enable assembler's
vector feature.

Signed-off-by: Greentime Hu <greentime.hu@...ive.com>
Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Reviewed-by: Greentime Hu <greentime.hu@...ive.com>
---
 arch/riscv/Kconfig  | 9 +++++++++
 arch/riscv/Makefile | 1 +
 2 files changed, 10 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 4f7b70ae7c31..619cfc370ee5 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -380,6 +380,15 @@ config FPU
 
 	  If you don't know what to do here, say Y.
 
+config VECTOR
+	bool "VECTOR support"
+	default n
+	help
+	  Say N here if you want to disable all vector related procedure
+	  in the kernel.
+
+	  If you don't know what to do here, say Y.
+
 endmenu
 
 menu "Kernel features"
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 428bd3bc202f..1450bdde5288 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -57,6 +57,7 @@ riscv-march-aflags-$(CONFIG_ARCH_RV32I)		:= rv32ima
 riscv-march-aflags-$(CONFIG_ARCH_RV64I)		:= rv64ima
 riscv-march-aflags-$(CONFIG_FPU)		:= $(riscv-march-aflags-y)fd
 riscv-march-aflags-$(CONFIG_RISCV_ISA_C)	:= $(riscv-march-aflags-y)c
+riscv-march-aflags-$(CONFIG_VECTOR)		:= $(riscv-march-aflags-y)v
 
 KBUILD_CFLAGS += -march=$(riscv-march-cflags-y)
 KBUILD_AFLAGS += -march=$(riscv-march-aflags-y)
-- 
2.31.1