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Date:   Mon, 16 May 2022 08:10:57 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Heiko Stuebner <heiko@sntech.de>
Cc:     palmer@dabbelt.com, paul.walmsley@sifive.com,
        aou@eecs.berkeley.edu, linux-riscv@lists.infradead.org,
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        rtrauben@gmail.com, samuel@sholland.org, cmuellner@linux.com,
        philipp.tomsich@vrull.eu, Wei Wu <lazyparser@gmail.com>,
        Daniel Lustig <dlustig@nvidia.com>,
        Bill Huffman <huffman@cadence.com>
Subject: Re: [PATCH 09/12] riscv: add RISC-V Svpbmt extension support
Message-ID: <20220516061057.GL12339@lst.de>
References: <20220511192921.2223629-1-heiko@sntech.de> <20220511192921.2223629-10-heiko@sntech.de>
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> +config RISCV_ISA_SVPBMT
> +	bool "SVPBMT extension support"

I don't think this prompt is very useful as it doesn't describe
what it does.  But do we even want people to disable it as it is
really essentially for a fully functioning kernel and a pity that
it took RISC-V so long to get there?

> +	depends on 64BIT && MMU
> +	select RISCV_ALTERNATIVE
> +	default y
> +	help
> +	   Adds support to dynamically detect the presence of the SVPBMT extension

overly long line here.

> index 5f1046e82d9f..dbfcd9b72bd8 100644
> --- a/arch/riscv/include/asm/errata_list.h
> +++ b/arch/riscv/include/asm/errata_list.h
> @@ -14,6 +14,9 @@
>  #define	ERRATA_SIFIVE_NUMBER 2
>  #endif
>  
> +#define	CPUFEATURE_SVPBMT 0
> +#define	CPUFEATURE_NUMBER 1

is errata_list.h really the right place for architectural features?

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>