linux-kernel - Re: [PATCH] x86/platform/uv: Use sysfs_match_string() for string parsing in param_set

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Message-ID: <ZQHpC/oKLwfJuvRu@swahl-linux>
Date:   Wed, 13 Sep 2023 11:56:11 -0500
From:   Steve Wahl <steve.wahl@....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] x86/platform/uv: Use sysfs_match_string() for string
 parsing in param_set_action()

On Wed, Sep 13, 2023 at 05:16:56PM +0200, Hans de Goede wrote:
> Remove the custom, hard to read code to:
> 
> 1. Make a copy of "val" with any potential '\n' at the end stripped
> 2. Compare the copy against an array of allowed string values
> 
> Linux has the sysfs_match_string() helper exactly for cases like this,
> switch to this.

Hans,

I like this patch, compiling and testing now.

I was wondering, as long as we're in the neighborhood, how you feel
about changing the stored variable uv_nmi_action to an int or enum
rather than a string, since it can only be one of 6 values, and the
string compare while processing an NMI strikes me as inefficent.

It could extend this patch, or be done as a follow on.  And I'm
willing to supply the effort if you want me to.

--> Steve Wahl

-- 
Steve Wahl, Hewlett Packard Enterprise