linux-kernel - Re: [Xen-devel] [PATCH 1/7] xen: import new ring macros in ring.h

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Date:   Tue, 7 Mar 2017 16:12:44 -0800 (PST)
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     Julien Grall <julien.grall@....com>
cc:     Stefano Stabellini <sstabellini@...nel.org>,
        xen-devel@...ts.xenproject.org, jgross@...e.com,
        linux-kernel@...r.kernel.org,
        Stefano Stabellini <stefano@...reto.com>,
        boris.ostrovsky@...cle.com
Subject: Re: [Xen-devel] [PATCH 1/7] xen: import new ring macros in ring.h

On Tue, 7 Mar 2017, Julien Grall wrote:
> Hi Stefano,
> 
> On 03/06/2017 08:01 PM, Stefano Stabellini wrote:
> > Sync the ring.h file with upstream Xen, to introduce the new ring macros.
> > They will be used by the Xen transport for 9pfs.
> > 
> > Signed-off-by: Stefano Stabellini <stefano@...reto.com>
> > CC: konrad.wilk@...cle.com
> > CC: boris.ostrovsky@...cle.com
> > CC: jgross@...e.com
> > 
> > ---
> > NB: The new macros have not been committed to Xen yet. Do not apply this
> > patch until they do.
> > ---
> > ---
> >  include/xen/interface/io/ring.h | 131
> > ++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 131 insertions(+)
> > 
> > diff --git a/include/xen/interface/io/ring.h
> > b/include/xen/interface/io/ring.h
> > index 21f4fbd..e16aa92 100644
> > --- a/include/xen/interface/io/ring.h
> > +++ b/include/xen/interface/io/ring.h
> 
> [...]
> 
> > +#define XEN_FLEX_RING_SIZE(order)
> > \
> > +    (1UL << (order + PAGE_SHIFT - 1))
> 
> This will need to be XEN_PAGE_SHIFT in order to works with 64K kernel.

Good point! I had it right at the beginning but I lost the change in one
of the updates from xen.git.