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xen-devel
RE: [Xen-devel] Re: [patch 21/26] Xen-paravirt_ops: Use the hvc console
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To: |
"Keir Fraser" <keir@xxxxxxxxxxxxx>, "Andrew Morton" <akpm@xxxxxxxxxxxxxxxxxxxx> |
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Subject: |
RE: [Xen-devel] Re: [patch 21/26] Xen-paravirt_ops: Use the hvc console infrastructure for Xen console |
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From: |
"Huang2, Wei" <Wei.Huang2@xxxxxxx> |
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Date: |
Fri, 16 Mar 2007 14:01:50 -0500 |
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Cc: |
xen-devel@xxxxxxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Keir Fraser <Keir.Fraser@xxxxxxxxxxxxx>, Wright <chrisw@xxxxxxxxxxxx>, Andi Kleen <ak@xxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Chris@xxxxxxxxxxxxx |
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Fri, 16 Mar 2007 12:03:26 -0700 |
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[Xen-devel] Re: [patch 21/26] Xen-paravirt_ops: Use the hvc console infrastructure for Xen console |
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
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