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From: "Ramkrishna Vepa" <ram.vepa@neterion.com>
To: "'Arthur Kepner'" <akepner@sgi.com>,
	"'Anton Blanchard'" <anton@samba.org>
Cc: "'Leonid Grossman'" <leonid.grossman@neterion.com>,
	<muhammad.shafiq@neterion.com>, <ramkrishna.vepa@neterion.com>,
	<netdev@oss.sgi.com>,
	"'Ravinandan Arakali'" <ravinandan.arakali@neterion.com>
Subject: RE: [PATCH] s2io: replace readq() with mmiowb() in s2io_xmit()
Date: Mon, 2 May 2005 19:58:38 -0700	[thread overview]
Message-ID: <03d401c54f8c$03917fd0$5c10100a@pc.s2io.com> (raw)
In-Reply-To: <Pine.LNX.4.61.0505021844480.16692@linux.site>

> > I didnt know mmiowb is supposed to be a replacement for PCI write
> > posting. Most architectures define mmiowb as nothing and so will be
> > broken with your change.
> >
> 
> I thought that an arch was supposed to define mmiowb() if it needs
> it. In this case, the readq() is only being used for the side-effect
> of ordering the previous writes (the neterion folks can correct me
> if I'm wrong).
[Ram] Yes, it is to ensure ordering as well as the flush of the io that is
required in some platforms.
 
> 
> --
> Arthur

  reply	other threads:[~2005-05-03  2:58 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <200504051836.j35IanDD005402@guinness.s2io.com>
2005-05-03  1:09 ` [PATCH] s2io: replace readq() with mmiowb() in s2io_xmit() Arthur Kepner
2005-05-03  1:40   ` Anton Blanchard
2005-05-03  2:11     ` Arthur Kepner
2005-05-03  2:58       ` Ramkrishna Vepa [this message]
2005-05-03  3:06         ` Anton Blanchard
2005-05-03 14:52           ` Arthur Kepner
2005-05-03 16:23             ` Ramkrishna Vepa
2005-05-03  3:05       ` Anton Blanchard

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