linux-kernel - Re: [PATCH] riscv: alternative only works on !XIP

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Date:   Thu, 10 Mar 2022 12:07:02 -0800 (PST)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     jszhang@...nel.org
CC:     Paul Walmsley <paul.walmsley@...ive.com>, aou@...s.berkeley.edu,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        heiko@...ech.de
Subject:     Re: [PATCH] riscv: alternative only works on !XIP_KERNEL

On Thu, 10 Feb 2022 08:49:43 PST (-0800), jszhang@...nel.org wrote:
> The alternative mechanism needs runtime code patching, it can't work
> on XIP_KERNEL. And the errata workarounds are implemented via the
> alternative mechanism. So add !XIP_KERNEL dependency for alternative
> and erratas.
>
> Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> ---
>  arch/riscv/Kconfig.erratas | 1 +
>  arch/riscv/Kconfig.socs    | 4 ++--
>  2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/arch/riscv/Kconfig.erratas b/arch/riscv/Kconfig.erratas
> index b44d6ecdb46e..0aacd7052585 100644
> --- a/arch/riscv/Kconfig.erratas
> +++ b/arch/riscv/Kconfig.erratas
> @@ -2,6 +2,7 @@ menu "CPU errata selection"
>
>  config RISCV_ERRATA_ALTERNATIVE
>  	bool "RISC-V alternative scheme"
> +	depends on !XIP_KERNEL
>  	default y
>  	help
>  	  This Kconfig allows the kernel to automatically patch the
> diff --git a/arch/riscv/Kconfig.socs b/arch/riscv/Kconfig.socs
> index 6ec44a22278a..c112ab2a9052 100644
> --- a/arch/riscv/Kconfig.socs
> +++ b/arch/riscv/Kconfig.socs
> @@ -14,8 +14,8 @@ config SOC_SIFIVE
>  	select CLK_SIFIVE
>  	select CLK_SIFIVE_PRCI
>  	select SIFIVE_PLIC
> -	select RISCV_ERRATA_ALTERNATIVE
> -	select ERRATA_SIFIVE
> +	select RISCV_ERRATA_ALTERNATIVE if !XIP_KERNEL
> +	select ERRATA_SIFIVE if !XIP_KERNEL
>  	help
>  	  This enables support for SiFive SoC platform hardware.

Thanks, this is on fixes.