From: Jeff Garzik <jeff@garzik•org>
To: Michael Buesch <mb@bu3sch•de>
Cc: Roland Dreier <rdreier@cisco•com>,
Andi Kleen <andi@firstfloor•org>,
ggrundstrom@neteffect•com, ewg@lists•openfabrics.org,
netdev@vger•kernel.org
Subject: Re: [PATCH 2/14] nes: device structures and defines
Date: Wed, 08 Aug 2007 12:59:08 -0400 [thread overview]
Message-ID: <46B9F65C.9060906@garzik.org> (raw)
In-Reply-To: <200708081843.36370.mb@bu3sch.de>
Michael Buesch wrote:
> writel doesn't guarantee flushing either.
> readl does.
Not quite -- there are multiple kinds of flushing. You're thinking
about flushing across PCI bridges, which is correct, but you also have
CPU write posting and CPU write ordering and such.
Without taking all that into account, you might be tempted to think that
__raw_readl() will perform all flushes necessary following a
__raw_writel() -- but that would be incorrect.
Jeff
next prev parent reply other threads:[~2007-08-08 16:59 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-08 0:45 [PATCH 2/14] nes: device structures and defines ggrundstrom
2007-08-08 1:13 ` Jeff Garzik
2007-08-08 12:38 ` Andi Kleen
2007-08-08 11:50 ` Michael Buesch
2007-08-08 12:55 ` Andi Kleen
2007-08-08 13:02 ` Michael Buesch
2007-08-08 13:08 ` Andi Kleen
2007-08-08 13:28 ` Michael Buesch
2007-08-08 13:38 ` Andi Kleen
2007-08-08 13:48 ` Michael Buesch
2007-08-08 13:55 ` Michael Buesch
2007-08-08 16:18 ` Roland Dreier
2007-08-08 16:25 ` Jeff Garzik
2007-08-08 16:30 ` Michael Buesch
2007-08-08 16:33 ` Jeff Garzik
2007-08-08 16:43 ` Michael Buesch
2007-08-08 16:46 ` Roland Dreier
2007-08-08 16:57 ` akepner
2007-08-08 16:59 ` Jeff Garzik [this message]
2007-08-08 17:34 ` Michael Buesch
2007-08-08 19:40 ` Jeff Garzik
2007-08-08 16:39 ` Roland Dreier
2007-08-08 16:19 ` Jeff Garzik
2007-08-08 22:04 ` David Miller
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