linux-kernel - Re: [PATCH v4 6/8] x86: Add hardware prefetch control support for x86

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Date:   Wed, 18 May 2022 08:44:48 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Kohei Tarumizu <tarumizu.kohei@...itsu.com>
Cc:     catalin.marinas@....com, will@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, rafael@...nel.org,
        mchehab+huawei@...nel.org, eugenis@...gle.com, tony.luck@...el.com,
        pcc@...gle.com, peterz@...radead.org, marcos@...a.pet,
        conor.dooley@...rochip.com, nicolas.ferre@...rochip.com,
        marcan@...can.st, linus.walleij@...aro.org, arnd@...db.de,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 6/8] x86: Add hardware prefetch control support for x86

On Wed, May 18, 2022 at 03:30:30PM +0900, Kohei Tarumizu wrote:
> Adds module init/exit code to create sysfs attributes for x86 with
> "hardware_prefetcher_enable", "ip_prefetcher_enable" and
> "adjacent_cache_line_prefetcher_enable".
> 
> This driver works only if a CPU model is mapped to type of register
> specification(e.g. TYPE_L12_BASE) in pfctl_match[].

How will the driver be automatically loaded if this is the case or not?
You can not rely on userspace knowing to load a driver on its own,
please tie into the proper device discovery.

thanks,

greg k-h