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Message-ID: <wrfjr3d0453y.fsf@redhat.com> Date: Tue, 17 May 2016 19:49:53 -0400 From: Jes Sorensen <Jes.Sorensen@...hat.com> To: Greg KH <gregkh@...uxfoundation.org> Cc: David Kershner <david.kershner@...sys.com>, corbet@....net, tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, erik.arfvidson@...sys.com, timothy.sell@...sys.com, hofrat@...dl.org, dzickus@...hat.com, alexander.curtin@...sys.com, janani.rvchndrn@...il.com, sudipm.mukherjee@...il.com, prarit@...hat.com, david.binder@...sys.com, nhorman@...hat.com, dan.j.williams@...el.com, linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, driverdev-devel@...uxdriverproject.org, sparmaintainer@...sys.com Subject: Re: [PATCH 0/5] add bus driver for Unisys s-Par paravirtualized devices to arch/x86 Greg KH <gregkh@...uxfoundation.org> writes: > On Tue, May 17, 2016 at 10:01:55AM -0400, Jes Sorensen wrote: >> Greg KH <gregkh@...uxfoundation.org> writes: >> > On Tue, May 17, 2016 at 03:27:56AM -0400, David Kershner wrote: >> >> This patchset moves the visorbus driver >> >> (fromdrivers/staging/unisys/visorbus) >> >> and its dependent headers files (from drivers/staging/unisys/include) >> >> out of staging into the main kernel tree. >> >> >> >> The visorbus driver is a bus driver for various paravirtualized devices >> >> presented within a Unisys s-Par guest environment. Drivers for these >> >> devices are also currently present under drivers/staging/unisys/, which we >> >> intend to also move out of staging immediately after visorbus. All of >> >> these other drivers are dependent upon visorbus and the include directory, >> >> which is why we would like to move these first. >> >> >> >> Our initial consultations with various members of the community have led us >> >> to the conclusion that the most appropriate locations for these is: >> >> arch/x86/visorbus/ (driver) >> >> include/linux/visorbus/ (header files) >> >> >> >> The rationale is that visorbus is dependent on x86-64 architecture. >> > >> > What makes it dependent on x86? What prevents it from running on some >> > other architecture (not the fact that no one has made such hardware, >> > just the code reasons please.) >> >> It's dependent on system firmware which is only available on the S-Par >> platform which is x86_64 only. The closest similarity is probably what >> you find on the PPC and Sparc platforms. > > Ok, but still no need to put it under arch/ anything, it should go in > drivers/ like all other drivers and busses are, no matter what the arch > it happens to run on is. I don't think thats obvious. arch/x86/kvm is an example of this, Sparc and PPC also have their stuff under arch/. I am open, if people prefer to have drivers/visorbus I can support that. I find right now it's really messy with things being put all over the place, and it's not obvious what the real placement is for all of this. Jes
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