linux-kernel - Re: [PATCH v4 12/21] arm64: cpufeature: Add an early command-line cpufeature override facility

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Date:   Sat, 23 Jan 2021 13:43:52 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Brazdil <dbrazdil@...gle.com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Jing Zhang <jingzhangos@...gle.com>,
        Ajay Patil <pajay@....qualcomm.com>,
        Prasad Sodagudi <psodagud@...eaurora.org>,
        Srinivas Ramana <sramana@...eaurora.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        kernel-team@...roid.com
Subject: Re: [PATCH v4 12/21] arm64: cpufeature: Add an early command-line
 cpufeature override facility

On Mon, Jan 18, 2021 at 09:45:24AM +0000, Marc Zyngier wrote:
> +struct reg_desc {
> +	const char * const	name;
> +	u64 * const		val;
> +	u64 * const		mask;
> +	struct {
> +		const char * const	name;
> +		u8			 shift;
> +	} 			fields[];
> +};

Sorry, I didn't see this earlier. Do we need to add all these consts
here? So you want the pointers to be const but why is 'shift' special
and not a const then? Is it modified later?

Would this not work:

struct reg_desc {
	const char	*name;
	u64		*val;
	u64		*mask;
	struct {
		const char	*name;
		u8		shift;
	} fields[];
};

> +static const struct reg_desc * const regs[] __initdata = {

as we already declare the whole struct reg_desc pointers here as const.
I may have confused myself...

-- 
Catalin