linux-kernel - Re: new driver for drivers/virt/?

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Date:	Wed, 18 May 2016 15:24:42 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	"Sell, Timothy C" <Timothy.Sell@...sys.com>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
	"timur@...escale.com" <timur@...escale.com>,
	"galak@...nel.crashing.org" <galak@...nel.crashing.org>,
	"Kershner, David A" <David.Kershner@...sys.com>,
	"corbet@....net" <corbet@....net>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"Arfvidson, Erik" <Erik.Arfvidson@...sys.com>,
	"hofrat@...dl.org" <hofrat@...dl.org>,
	"dzickus@...hat.com" <dzickus@...hat.com>,
	"Curtin, Alexander Paul" <Alexander.Curtin@...sys.com>,
	"janani.rvchndrn@...il.com" <janani.rvchndrn@...il.com>,
	"sudipm.mukherjee@...il.com" <sudipm.mukherjee@...il.com>,
	"prarit@...hat.com" <prarit@...hat.com>,
	"Binder, David Anthony" <David.Binder@...sys.com>,
	"nhorman@...hat.com" <nhorman@...hat.com>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"driverdev-devel@...uxdriverproject.org" 
	<driverdev-devel@...uxdriverproject.org>,
	*S-Par-Maintainer <SParMaintainer@...sys.com>,
	Jes Sorensen <Jes.Sorensen@...hat.com>
Subject: Re: new driver for drivers/virt/?

On Thu, May 19, 2016 at 12:11:46AM +0200, Thomas Gleixner wrote:
> On Wed, 18 May 2016, Sell, Timothy C wrote:
> > We have a bus driver currently in drivers/staging/unisys/visorbus/ that
> > we are trying to get out of staging and into the kernel proper.  Since
> > "visorbus" is a driver to host a virtual bus presented to a Linux guest
> > in a hypervisor environment (refer to 
> > drivers/staging/unisys/Documentation/overview.txt for more details),
> > Greg KH and Jes Sorensen have suggested the possibility that drivers/virt/
> > might be a good place for visorbus.  But right now, we see that the only
> > driver under drivers/virt/ is the Freescale hypervisor environment, which
> > made us wonder whether this was really the correct place.
> > 
> > Would you have any guidance for us?
> > Our intent is to push our visorbus out of staging immediately following
> > the current merge window.
> 
> What's the problem with Gregs and Jes suggestion? I don't see any.

Neither do I, odd that they wanted a third opinion :(

> There is bigger fish to fry than the final place of this driver. I had just a
> peek at the staging code and there is enough stuff which wants to be cleaned
> up before moving anywhere. I don't have time to do a proper review now, but
> here are a few hints upfront:

<snip>

I don't think anyone has given a good review of the code yet, I know
it's been a long time for me.  It's on my todo list, but that's not
going to happen until way after 4.7-rc1 is out.  Thanks for this initial
list.

greg k-h