Re: [PATCH] Define wc_wmb, a write barrier for PCI write combining

[Bryan O'Sullivan]

On Tue, 2006-02-28 at 05:01 -0500, Jes Sorensen wrote:

> Could you explain why the current mmiowb() API won't suffice for this?
> It seems that this is basically trying to achieve the same thing.

It's a no-op on every arch I care about:

#define mmiowb()

Which makes it useless.  Also, based on the comments in the qla driver,
mmiowb() seems to have inter-CPU ordering semantics that I don't want.
I'm thus hesitant to appropriate it for my needs.

	<b

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/