Re: [RFC PATCH v8 13/21] riscv: Add support for kernel mode vector

[Christoph Hellwig]

On Thu, Sep 09, 2021 at 01:45:25AM +0800, Greentime Hu wrote:
> +obj-$(CONFIG_VECTOR)		+= kernel_mode_vector.o
> +riscv-march-cflags-$(CONFIG_ARCH_RV32I)		:= rv32ima
> +riscv-march-cflags-$(CONFIG_ARCH_RV64I)		:= rv64ima
> +riscv-march-cflags-$(CONFIG_RISCV_ISA_C)	:= $(riscv-march-cflags-y)c
> +riscv-march-cflags-$(CONFIG_VECTOR)		:= $(riscv-march-cflags-y)v
> +CFLAGS_kernel_mode_vector.o	+= -march=$(riscv-march-cflags-y)

Do we need a helper in arch/riscv/Makefile to define the vector flags
instead of open coding them where used?  Also I think the variable
name should include vector in it.


> +EXPORT_SYMBOL(kernel_rvv_begin);

> +EXPORT_SYMBOL(kernel_rvv_end);

This needs to be EXPORT_SYMBOL_GPL just like x86 kernel_fpu_begin/end