linux-kernel - Re: [PATCH v9 01/17] riscv: Separate patch for cflags and aflags

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Date:   Tue, 14 Dec 2021 08:29:17 -0800 (PST)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     greentime.hu@...ive.com
CC:     Paul Walmsley <paul.walmsley@...ive.com>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        aou@...s.berkeley.edu
Subject:     Re: [PATCH v9 01/17] riscv: Separate patch for cflags and aflags

On Tue, 09 Nov 2021 01:48:13 PST (-0800), greentime.hu@...ive.com wrote:
> From: Guo Ren <ren_guo@...ky.com>
>
> Use "subst fd" in Makefile is a hack way and it's not convenient
> to add new ISA feature. Just separate them into riscv-march-cflags
> and riscv-march-aflags.
>
> Signed-off-by: Guo Ren <ren_guo@...ky.com>
> Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
> Signed-off-by: Greentime Hu <greentime.hu@...ive.com>
> ---
>  arch/riscv/Makefile | 18 ++++++++++++------
>  1 file changed, 12 insertions(+), 6 deletions(-)
>
> diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
> index 0eb4568fbd29..37de70df4fae 100644
> --- a/arch/riscv/Makefile
> +++ b/arch/riscv/Makefile
> @@ -48,12 +48,18 @@ endif
>  endif
>
>  # ISA string setting
> -riscv-march-$(CONFIG_ARCH_RV32I)	:= rv32ima
> -riscv-march-$(CONFIG_ARCH_RV64I)	:= rv64ima
> -riscv-march-$(CONFIG_FPU)		:= $(riscv-march-y)fd
> -riscv-march-$(CONFIG_RISCV_ISA_C)	:= $(riscv-march-y)c
> -KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
> -KBUILD_AFLAGS += -march=$(riscv-march-y)
> +riscv-march-cflags-$(CONFIG_ARCH_RV32I)		:= rv32ima
> +riscv-march-cflags-$(CONFIG_ARCH_RV64I)		:= rv64ima
> +riscv-march-$(CONFIG_FPU)			:= $(riscv-march-y)fd
> +riscv-march-cflags-$(CONFIG_RISCV_ISA_C)	:= $(riscv-march-cflags-y)c
> +
> +riscv-march-aflags-$(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)	:= $(riscv-march-aflags-y)c
> +
> +KBUILD_CFLAGS += -march=$(riscv-march-cflags-y)
> +KBUILD_AFLAGS += -march=$(riscv-march-aflags-y)
>
>  KBUILD_CFLAGS += -mno-save-restore
>  KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)

Reviewed-by: Palmer Dabbelt <palmer@...osinc.com>