From: Matthew Wilcox <matthew@wil.cx>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Matthew Wilcox <matthew@wil.cx>, parisc-linux@thepuffingroup.com
Subject: Re: [parisc-linux] ZONE_DMA
Date: Mon, 1 Jan 2001 18:55:57 +0000 [thread overview]
Message-ID: <20010101185557.A25603@parcelfarce.linux.theplanet.co.uk> (raw)
In-Reply-To: <E14D9kj-00019e-00@the-village.bc.nu>; from alan@lxorguk.ukuu.org.uk on Mon, Jan 01, 2001 at 06:32:11PM +0000
On Mon, Jan 01, 2001 at 06:32:11PM +0000, Alan Cox wrote:
> Or know something about their hardware being crap.
Hm.
> > So how should we be populating our zones? Put all of our memory in
> > ZONE_DMA, like ppc, since the only people who'll be specifying GFP_DMA
> > will have done so incorrectly? Put the first 16MB of it in there,
>
> That is a very dangerous assumption (as some PPC people have discovered when
> they DMA stuff into the wrong place)
>
> > since we might support ISA some day? Put none of it in there on the
> > grounds we don't support ISA at all?
>
> I think none is safer. pci_alloc_consistent seems to address all the stuff
> we worry about.
But if we have none, then all GFP_DMA allocations will fail. Which
includes the scsi midlayers. Ooh, I just noticed that scsi_scan.c
is broken... expect a patch RSN.
--
Revolutions do not require corporate support.
next prev parent reply other threads:[~2001-01-01 18:52 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-01 17:43 [parisc-linux] ZONE_DMA Matthew Wilcox
2001-01-01 18:09 ` Alan Cox
2001-01-01 18:24 ` Matthew Wilcox
2001-01-01 18:32 ` Alan Cox
2001-01-01 18:55 ` Matthew Wilcox [this message]
2001-01-01 19:01 ` Alan Cox
2001-01-01 19:18 ` Matthew Wilcox
2001-01-02 0:59 ` Grant Grundler
2001-01-02 1:21 ` Matthew Wilcox
2001-01-02 6:46 ` Grant Grundler
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