netdev - Re: drivers/net/enic/vnic

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Date:	Fri, 10 Oct 2008 11:29:23 -0700
From:	Scott Feldman <sfeldma@...vasystems.com>
To:	Roland Dreier <rdreier@...co.com>,
	David Miller <davem@...emloft.net>
CC:	<akpm@...ux-foundation.org>, <mingo@...e.hu>,
	<netdev@...r.kernel.org>
Subject: Re: drivers/net/enic/vnic_cq.c

On 10/10/08 10:10 AM, "Roland Dreier" <rdreier@...co.com> wrote:

> cc'ing Scott so we can make sure that this actually is atomic enough to
> work with the enic hardware... (Scott, the context is that enic won't
> build on any architecture that doesn't define writeq and readq, such as
> 32-bit x86; however the definitions below make it possible that multiple
> 32-bit writes will be interleaved, eg if an interrupt occurs between the
> first writel and the second writel)

Yes, enic hw provides atomic read/write for 64-bit regs even if register is
accessed with 32-bit read/writes.

-scott

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