Re: [Embedded-pv-devel] [PATCH v9] xen: add para-virtual sound interface header files

[Julien Grall <julien.grall@xxxxxxx>]

Hello Oleksandr,

On 24/11/16 12:53, Oleksandr Andrushchenko wrote:
> > Any people who wants to use the PV driver for other OS than Linux will have
> > to do it. So, may I ask why don't you write a platform agnostic header?
> >
> > This would also make easier to share the PV driver code between different
> > OS.
> There are 2 files: sndif.h which is platform agnostic and sndif_linux.h
I don't consider sndif.h been agnostic. It is just a bunch of array 
definition. Each OS would have to implement their own headers in order 
to easily access command fields.
> which is Linux platform specific (this is exactly the file which every platform
> will need to define, e.g. sndif_windows.h).
> In my case I need it to at least define Linux specific __packed
> attribute which is not supported by Win AFAIK.
All the other PV protocols are able to define structure that are 
platform agnostic. I would like to understand why you cannot do this here.
Not mentioning that using __packed is usually a bad idea because it can 
mess-up with the natural alignment of the fields and makes the 
programmer's life more miserable (see an example in drm PV drivers).
Regards,

--
Julien Grall

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