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Re: [patch] x86_*fence replaced by membar_ops(3)
On Wed, Jan 14, 2009 at 07:55:09PM +0100, Jean-Yves Migeon wrote:
> These are the first steps to have MI Xen drivers (hi christoph!), by
> replacing all the x86_*fence memory ops to their "equivalent" ones from
> the membar_ops(3) API. See [1].
The x86 fence functions and generic memory barrier operations are not
equivalent.
membar_foo() are for memory barriers in a multiprocessor system.
The fence functions are used for memory barriers in respect of DMA even on a
uniprocessor system, or in a system like Xen where the NetBSD kernel is
uniprocessor but the monitor can be on a different CPU.
> [1] http://www.netbsd.org/~jym/membar_ops.diff
This should not be committed as is.
Thanks,
Andrew
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