Re: [Xen-devel] [PATCH v5 1/4] ring.h: introduce macros to handle monodirectional rings with multiple req sizes

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Wed, 29 Mar 2017, Jan Beulich wrote:
> >>> On 29.03.17 at 00:08, <sstabellini@xxxxxxxxxx> wrote:
> > --- a/xen/include/public/io/ring.h
> > +++ b/xen/include/public/io/ring.h
> > @@ -27,6 +27,21 @@
> >  #ifndef __XEN_PUBLIC_IO_RING_H__
> >  #define __XEN_PUBLIC_IO_RING_H__
> >  
> > +/*
> > + * When #include'ing this header, you need to provide the following
> > + * declaration upfront:
> > + * - standard integers types (uint8_t, uint16_t, etc)
> > + * They are provided by stdint.h of the standard headers.
> > + *
> > + * In addition, if you intend to use the FLEX macros, you also need to
> > + * provide:
> > + * - size_t
> > + * - memcpy
> > + * - grant_ref_t
> > + * These declarations are provided by string.h of the standard headers,
> > + * and grant_table.h from the Xen public headers.
> > + */
> 
> Btw, there's another difference only implied so far: The integer
> types indeed need to be made available up front (as spelled out).
> The others can as well be made available after ring.h inclusion,
> as long as that happens before invoking any of the macros.

OK

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