linux-kernel - Re: [PATCH v2 5/6] tpm: add driver for cr50 on SPI

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Date:   Wed, 17 Jul 2019 14:25:44 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Alexander Steffen <Alexander.Steffen@...ineon.com>,
        Peter Huewe <peterhuewe@....de>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Andrey Pronin <apronin@...omium.org>,
        linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-integrity@...r.kernel.org,
        Duncan Laurie <dlaurie@...omium.org>,
        Guenter Roeck <groeck@...omium.org>
Subject: Re: [PATCH v2 5/6] tpm: add driver for cr50 on SPI

On Wed, Jul 17, 2019 at 10:22:20AM -0700, Stephen Boyd wrote:
> Quoting Jason Gunthorpe (2019-07-17 10:12:16)
> > On Wed, Jul 17, 2019 at 10:05:52AM -0700, Stephen Boyd wrote:
> > > 
> > > Yes. The space savings comes from having the extra module 'cr50.ko' that
> > > holds almost nothing at all when the two drivers are modules.
> > 
> > I'm not sure it is an actual savings, there is alot of minimum
> > overhead and alignment to have a module in the first place.
> > 
> 
> Yeah. I'm pretty sure that's why it's a bool and not a tristate for this
> symbol. A module has overhead that is not necessary for these little
> helpers.

Linking driver stuff like that to the kernel is pretty hacky, IMHO

Jason