linux-kernel - Re: [RFC PATCH 00/16] x86/split_lock: Enable #AC exception for split locked accesses

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Message-ID: <20180621224351.GB18979@romley-ivt3.sc.intel.com>
Date:   Thu, 21 Jun 2018 15:43:52 -0700
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...e.hu>,
        "H. Peter Anvin" <hpa@...ux.intel.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Alan Cox <alan@...ux.intel.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        Arjan van de Ven <arjan@...radead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [RFC PATCH 00/16] x86/split_lock: Enable #AC exception for split
 locked accesses

On Fri, Jun 22, 2018 at 12:11:14AM +0200, Peter Zijlstra wrote:
> On Thu, Jun 21, 2018 at 03:00:03PM -0700, Fenghua Yu wrote:
> > The control knob for user is to choose killing the process (default) or
> > re-executing the faulting instruction without blocking the process.
> > Re-executing the instruction maybe be useful in platforms that run
> > well controlled apps with less split locks.
> 
> Just fix the applications. I doubt there will be many, many other
> platforms will already SIGBUS on unaligned access, atomic or not.

Ok. I will just kill the process by SIGBUS and remove the control knob
in the next version.

Thanks.

-Fenghua