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xen-devel
[Xen-devel] Re: [RFC PATCH 02/33] Add sync bitops
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To: |
Chris Wright <chrisw@xxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [RFC PATCH 02/33] Add sync bitops |
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From: |
Arjan van de Ven <arjan@xxxxxxxxxxxxx> |
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Date: |
Tue, 18 Jul 2006 11:56:41 +0200 |
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Cc: |
Andrew Morton <akpm@xxxxxxxx>, Zachary Amsden <zach@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Ian Pratt <ian.pratt@xxxxxxxxxxxxx>, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Andi Kleen <ak@xxxxxxx>, virtualization@xxxxxxxxxxxxxx, Christoph Lameter <clameter@xxxxxxx>, Christian Limpach <Christian.Limpach@xxxxxxxxxxxx> |
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Thu, 20 Jul 2006 05:06:59 -0700 |
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On Tue, 2006-07-18 at 00:00 -0700, Chris Wright wrote:
> plain text document attachment (synch-ops)
> Add "always lock'd" implementations of set_bit, clear_bit and
> change_bit and the corresponding test_and_ functions. Also add
> "always lock'd" implementation of cmpxchg. These give guaranteed
> strong synchronisation and are required for non-SMP kernels running on
> an SMP hypervisor.
Hi,
this sounds really like the wrong approach; you know you're compiling
for xen, so why not just make set_bit() and the others use the lock'd
instructions at compile time?
Greetings,
Arjan van de Ven
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