linux-kernel - Re: [PATCH V5 1/3] platform/x86: Add Intel Software Defined Silicon driver

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Message-ID: <372f76f7b1b7cf3d0ca38a7a84bcc23322ff12ed.camel@linux.intel.com>
Date:   Fri, 04 Feb 2022 05:23:07 -0800
From:   "David E. Box" <david.e.box@...ux.intel.com>
To:     Joe Perches <joe@...ches.com>, hdegoede@...hat.com,
        gregkh@...uxfoundation.org, andriy.shevchenko@...ux.intel.com,
        srinivas.pandruvada@...el.com, mgross@...ux.intel.com
Cc:     linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        Mark Gross <markgross@...nel.org>
Subject: Re: [PATCH V5 1/3] platform/x86: Add Intel Software Defined Silicon
 driver

On Fri, 2022-02-04 at 02:14 -0800, Joe Perches wrote:
> On Thu, 2022-02-03 at 21:30 -0800, David E. Box wrote:
> > Intel Software Defined Silicon (SDSi) is a post manufacturing mechanism for
> > activating additional silicon features. Features are enabled through a
> > license activation process.
> 
> Why isn't this a user process and not a kernel one?

This is a mechanism for provisioning CPU features during runtime. It requires a
driver to access the functionality. That functionality is discovered on a multi
functional PCI device that is owned by the upstream intel_vsec driver.

> 
> > V5
> >   - Update kernel version to 5.18 in API doc and copyrights to 2022.
> >   - Remove unneeded prototypes.
> >   - In binary attribute handlers where ret is only used for errors,
> >     replace,
> >               return (ret < 0) ? ret : size;
> >     with,
> >               return ret ?: size;
> 
> I think this style overly tricky.
> 
> Why not the canonical:
> 
> 	if (ret < 0)
> 		return ret;
> 
> 	return size;

I can see not using the 2 parameter shortcut of the ternary operator, but the
regular 3 parameter expression is easy to read for simple operations.

David

> 
>