Messages in this thread | | | From | Jes Sorensen <> | Subject | Re: [PATCH 0/5] add bus driver for Unisys s-Par paravirtualized devices to arch/x86 | Date | Tue, 17 May 2016 10:01:55 -0400 |
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Greg KH <gregkh@linuxfoundation.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.
Jes
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