Re: [PATCH] riscv: Apply a static assert to riscv_isa_ext_id

From: "Heiko Stübner" <heiko@sntech.de>
To: linux-riscv@lists.infradead.org, Andrew Jones <ajones@ventanamicro.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Conor Dooley <conor.dooley@microchip.com>,
	Jisheng Zhang <jszhang@kernel.org>
Subject: Re: [PATCH] riscv: Apply a static assert to riscv_isa_ext_id
Date: Thu, 01 Dec 2022 12:55:00 +0100	[thread overview]
Message-ID: <4469409.BEx9A2HvPv@diego> (raw)
In-Reply-To: <20221201113750.18021-1-ajones@ventanamicro.com>

Am Donnerstag, 1. Dezember 2022, 12:37:50 CET schrieb Andrew Jones:
> Add a static assert to ensure a RISCV_ISA_EXT_* enum is never
> created with a value >= RISCV_ISA_EXT_MAX. We can do this by
> putting RISCV_ISA_EXT_ID_MAX to more work. Before it was
> redundant with RISCV_ISA_EXT_MAX and hence only used to
> document the limit. Now it grows with the enum and is used to
> check the limit.
> 
> Signed-off-by: Andrew Jones <ajones@ventanamicro.com>

Reviewed-by: Heiko Stuebner <heiko.stuebner@vrull.eu>

> ---
>  arch/riscv/include/asm/hwcap.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> index b22525290073..86328e3acb02 100644
> --- a/arch/riscv/include/asm/hwcap.h
> +++ b/arch/riscv/include/asm/hwcap.h
> @@ -59,8 +59,9 @@ enum riscv_isa_ext_id {
>  	RISCV_ISA_EXT_ZIHINTPAUSE,
>  	RISCV_ISA_EXT_SSTC,
>  	RISCV_ISA_EXT_SVINVAL,
> -	RISCV_ISA_EXT_ID_MAX = RISCV_ISA_EXT_MAX,
> +	RISCV_ISA_EXT_ID_MAX
>  };
> +static_assert(RISCV_ISA_EXT_ID_MAX <= RISCV_ISA_EXT_MAX);
>  
>  /*
>   * This enum represents the logical ID for each RISC-V ISA extension static
> 


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