RE: [Xen-devel] Re: [patch 21/26] Xen-paravirt_ops: Use the hvc console infrastructure for Xen console

["Huang2, Wei" <Wei.Huang2@xxxxxxx>]

But it is shorter than from JFK or Newark. 

-----Original Message-----
From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Keir Fraser
Sent: Friday, March 16, 2007 6:58 AM
To: Andrew Morton; Keir Fraser
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx; Andi Kleen;
linux-kernel@xxxxxxxxxxxxxxx; Keir Fraser; Wright;
virtualization@xxxxxxxxxxxxxx; Ingo Molnar; Chris@xxxxxxxxxxxxx
Subject: Re: [Xen-devel] Re: [patch 21/26] Xen-paravirt_ops: Use the hvc
console infrastructure for Xen console

On 16/3/07 11:41, "Andrew Morton" <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:

>> It's needed for writing data /after/ reading the consumer index that
shows
>> you have space to write. Looking through xenbus_comms.c I think all
the
>> barriers are correct except there is a spurious extra mb() in
xb_read(),
>> where there is a later rmb() which is sufficient by itself. All the
others
>> have a purpose.
>> 
> 
> If Ingo couldn't work this out from reading the code then nobody else
can,
> and we have a maintainability problem which can only be solved with
> adequate commenting.

Agreed. I've fixed up the commenting, removed the spurious mb(), and I
just
need Jeremy to merge that change into the Xen pv_ops patchset. :-)

 -- Keir


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel





_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel