From: Grant Grundler <grundler@parisc-linux.org>
To: Jesse Barnes <jbarnes@engr.sgi.com>
Cc: linux-kernel@vger.kernel.org, grundler@parisc-linux.org, gnb@sgi.com
Subject: Re: [PATCH] deviceiobook.tmpl update
Date: Fri, 29 Oct 2004 16:45:12 -0600 [thread overview]
Message-ID: <20041029224512.GB11024@colo.lackof.org> (raw)
In-Reply-To: <200410291541.49481.jbarnes@engr.sgi.com>
On Fri, Oct 29, 2004 at 03:41:49PM -0700, Jesse Barnes wrote:
> Greg and Grant, how does this small update look?
looks good to me.
thanks,
grant
>
> Thanks,
> Jesse
> ===== Documentation/DocBook/deviceiobook.tmpl 1.5 vs edited =====
> --- 1.5/Documentation/DocBook/deviceiobook.tmpl 2004-10-25 13:06:49 -07:00
> +++ edited/Documentation/DocBook/deviceiobook.tmpl 2004-10-29 15:38:01 -07:00
> @@ -195,7 +195,12 @@
> be strongly ordered coming from different CPUs. Thus it's important
> to properly protect parts of your driver that do memory-mapped writes
> with locks and use the <function>mmiowb</function> to make sure they
> - arrive in the order intended.
> + arrive in the order intended. Issuing a regular <function>readX
> + </function> will also ensure write ordering, but should only be used
> + when the driver has to be sure that the write has actually arrived
> + at the device (not that it's simply ordered with respect to other
> + writes), since a full <function>readX</function> is a relatively
> + expensive operation.
> </para>
...
next prev parent reply other threads:[~2004-10-29 22:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-29 22:41 Jesse Barnes
2004-10-29 22:45 ` Grant Grundler [this message]
2004-10-31 0:47 ` Greg Banks
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