From: "David S. Miller" <davem@redhat.com>
To: alan@lxorguk.ukuu.org.uk
Cc: perex@suse.cz, jgarzik@pobox.com, linux-kernel@vger.kernel.org,
alan@redhat.com
Subject: Re: [PATCH] ALSA update [6/10] - 2002/07/20
Date: Mon, 30 Sep 2002 13:33:01 -0700 (PDT) [thread overview]
Message-ID: <20020930.133301.83692002.davem@redhat.com> (raw)
In-Reply-To: <1033390451.16337.33.camel@irongate.swansea.linux.org.uk>
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Date: 30 Sep 2002 13:54:11 +0100
On Mon, 2002-09-30 at 01:53, David S. Miller wrote:
> EISA/ISA DMA is defined as using a hwdev of NULL or requiring
> <16MB address, he is preserving GFP_DMA in those cases.
Firstly the DMA mask on x86 can't be below 24bits, we don't support
allocation from a smaller zone.
Understood.
Secondly what about PCI for 25-31bits -
there we do need to force gfp_dma to have any chance of getting the
right pages
Look at what his code does after the GFP_DMA setting, it goes
a non-GFP_DMA setting, and if the 25-31 bits case is not satisfied
it backs down to GFP_DMA.
Giving the page allocator a mask argument does sound a lot nicer
It's pretty simple to implement too since we do have page_to_phys.
next prev parent reply other threads:[~2002-09-30 20:34 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-29 18:51 [PATCH] ALSA update [6/10] - 2002/07/20 Jaroslav Kysela
2002-09-29 19:12 ` Arjan van de Ven
2002-09-29 19:28 ` Jaroslav Kysela
2002-09-29 19:52 ` Jeff Garzik
2002-09-29 20:34 ` Jaroslav Kysela
2002-09-29 21:19 ` Alan Cox
2002-09-30 0:53 ` David S. Miller
2002-09-30 12:54 ` Alan Cox
2002-09-30 16:17 ` Jaroslav Kysela
2002-09-30 20:33 ` David S. Miller [this message]
2002-09-30 0:22 ` David S. Miller
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