linux-kernel - Re: [PATCH v2 4/4] x86/split_lock: Disable #AC for split locked accesses

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Message-ID: <673faf24-7069-0195-d8b8-dd50a54b2e7f@intel.com>
Date:   Fri, 29 Jun 2018 09:31:11 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, H Peter Anvin <hpa@...or.com>
Cc:     Ashok Raj <ashok.raj@...el.com>, Alan Cox <alan@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [PATCH v2 4/4] x86/split_lock: Disable #AC for split locked
 accesses

On 06/29/2018 07:33 AM, Fenghua Yu wrote:
> +	ac_split_lock_off [X86]
> +			Disable #AC exception for split locked accesses.
> +			By default, this feature is enabled in kernel.

FWIW, I detest the "ac_" nomenclature this patch spreads around.  It's
marginally passable for in-kernel use, but I'd rather see it stopped
where it reflects out to user-visible places.  Let's give this a logical
name, like:

	split_lock_detect=off