linux-kernel - Re: [PATCH 09/12] riscv: add RISC-V Svpbmt extension support

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Date:   Mon, 16 May 2022 08:10:57 +0200
From:   Christoph Hellwig <hch@....de>
To:     Heiko Stuebner <heiko@...ech.de>
Cc:     palmer@...belt.com, paul.walmsley@...ive.com,
        aou@...s.berkeley.edu, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, wefu@...hat.com,
        liush@...winnertech.com, guoren@...nel.org, atishp@...shpatra.org,
        anup@...infault.org, drew@...gleboard.org, hch@....de,
        arnd@...db.de, wens@...e.org, maxime@...no.tech,
        gfavor@...tanamicro.com, andrea.mondelli@...wei.com,
        behrensj@....edu, xinhaoqu@...wei.com, mick@....forth.gr,
        allen.baum@...erantotech.com, jscheid@...tanamicro.com,
        rtrauben@...il.com, samuel@...lland.org, cmuellner@...ux.com,
        philipp.tomsich@...ll.eu, Wei Wu <lazyparser@...il.com>,
        Daniel Lustig <dlustig@...dia.com>,
        Bill Huffman <huffman@...ence.com>
Subject: Re: [PATCH 09/12] riscv: add RISC-V Svpbmt extension support

> +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@....de>