linux-kernel - Re: [RFC 00/10] Introduce In Field Scan driver

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Date:   Wed, 16 Mar 2022 09:09:19 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     "Joseph, Jithu" <jithu.joseph@...el.com>,
        "hdegoede@...hat.com" <hdegoede@...hat.com>,
        "markgross@...nel.org" <markgross@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        "corbet@....net" <corbet@....net>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "patches@...ts.linux.dev" <patches@...ts.linux.dev>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>
Subject: Re: [RFC 00/10] Introduce In Field Scan driver

On Tue, Mar 15, 2022 at 04:10:59PM +0000, Luck, Tony wrote:
> > Again, I have no idea what you are doing at all with this driver, nor
> > what you want to do with it.
> >
> > Start over please.
> 
> TL;DR is that silicon ages and some things break that don't have parity/ECC checks.
> So systems start behaving erratically. If you are lucky they crash. If you are less lucky
> they give incorrect results.
> 
> There's a paper (and even a movie 11 minutes) that describe the research by
> Google on this.
> https://sigops.org/s/conferences/hotos/2021/papers/hotos21-s01-hochschild.pdf  
> (https://www.youtube.com/watch?v=QMF3rqhjYuM)    

Both you and Dan are assuming that I actually care about this hardware
and driver enough to read a presentation or watch a video about it.
Sorry, but that's not happening :)

I'm saying these questions as you all need to be asking yourself that,
and figuring out what the proper api is.  That's not my job here.  I was
just pointing out the problems in your original submission that you all
should have caught before sending it out...

good luck!

greg k-h