linux-kernel - Re: [PATCH 01/17] arm64: arch_timer: Add infrastructure for multiple erratum detection methods

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Date:   Mon, 20 Mar 2017 13:51:58 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Marc Zyngier <marc.zyngier@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Scott Wood <oss@...error.net>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Hanjun Guo <hanjun.guo@...aro.org>,
        Ding Tianhong <dingtianhong@...wei.com>
Subject: Re: [PATCH 01/17] arm64: arch_timer: Add infrastructure for multiple
 erratum detection methods

Hi,

On Mon, Mar 06, 2017 at 11:26:06AM +0000, Marc Zyngier wrote:
> We're currently stuck with DT when it comes to handling errata, which
> is pretty restrictive. In order to make things more flexible, let's
> introduce an infrastructure that could support alternative discovery
> methods. No change in functionnality.

Nit: functionality

> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
> ---
>  arch/arm64/include/asm/arch_timer.h  |  7 +++-
>  drivers/clocksource/arm_arch_timer.c | 80 +++++++++++++++++++++++++++++++-----
>  2 files changed, 75 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/arch_timer.h b/arch/arm64/include/asm/arch_timer.h
> index b4b34004a21e..1c92d52619a6 100644
> --- a/arch/arm64/include/asm/arch_timer.h
> +++ b/arch/arm64/include/asm/arch_timer.h
> @@ -37,9 +37,14 @@ extern struct static_key_false arch_timer_read_ool_enabled;
>  #define needs_unstable_timer_counter_workaround()  false
>  #endif
>  
> +enum arch_timer_erratum_match_type {
> +	ate_match_dt,
> +};
>  
>  struct arch_timer_erratum_workaround {
> -	const char *id;		/* Indicate the Erratum ID */
> +	enum arch_timer_erratum_match_type match_type;
> +	const void *id;		/* Indicate the Erratum ID */

This comment isn't much help. Can we drop it?

Either that, or expand on what it is in each case, e.g.

	/*
	 * Data specific to the match_type.
	 *
	 * For ate_match_dt, this is a DT property name to look for.
	 */
	const void *id;

> +	const char *desc_str;

Elesewhere we just the name desc for strings like this.

Can we s/desc_str/desc/, please?

Thanks,
Mark.