linux-kernel - Re: [PATCH v2] x86/platform/uv: Rework NMI "action" modparam handling

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Date:   Thu, 14 Sep 2023 11:42:46 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Steve Wahl <steve.wahl@....com>,
        Justin Ernst <justin.ernst@....com>,
        Kyle Meyer <kyle.meyer@....com>,
        Dimitri Sivanich <dimitri.sivanich@....com>,
        Russ Anderson <russ.anderson@....com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Justin Stitt <justinstitt@...gle.com>
Subject: Re: [PATCH v2] x86/platform/uv: Rework NMI "action" modparam handling

On Wed, Sep 13, 2023 at 9:01 PM Hans de Goede <hdegoede@...hat.com> wrote:
>
> Rework NMI "action" modparam handling:
>
> 1. Replace the uv_nmi_action string with an enum; and
> 2. Use sysfs_match_string() for string parsing in param_set_action()

...

Don't you need to include string.h?

...

> +enum action_t {
> +       nmi_act_kdump,
> +       nmi_act_dump,
> +       nmi_act_ips,
> +       nmi_act_kdb,
> +       nmi_act_kgdb,
> +       nmi_act_health,
>  };

> +
> +static_assert(ARRAY_SIZE(actions) == ARRAY_SIZE(actions_desc));

I believe with enum in place you don't need this, just add a terminator to it

enum action_t {
   ...
   nmi_act_max
};

and use as an array size both arrays.

...

> -       int i;
> -       int n = ARRAY_SIZE(valid_acts);

> +       int i, n = ARRAY_SIZE(actions);

Since you are changing them, why not make them unsigned?

...

> -       pr_err("UV: Invalid NMI action:%s, valid actions are:\n", arg);
> +       pr_err("UV: Invalid NMI action:%s, valid actions are:\n", val);

As mentioned previously the val may or may not have a new line in it.
I dunno about comma removal, but a new line presence can be easily checked.

Either way it's not so critical, hence removing comma. or replacing it
by '-' (dash) may be enough.


-- 
With Best Regards,
Andy Shevchenko