From: "David S. Miller" <davem@redhat.com>
To: sct@redhat.com
Cc: kanoj@google.engr.sgi.com, roman@augan.com, linux-mm@kvack.org,
linux-kernel@vger.rutgers.edu, rmk@arm.linux.org.uk,
nico@cam.org, davidm@hpl.hp.com, alan@lxorguk.ukuu.org.uk
Subject: Re: pte_pagenr/MAP_NR deleted in pre6
Date: Wed, 16 Aug 2000 11:24:23 -0700 [thread overview]
Message-ID: <200008161824.LAA09497@pizda.ninka.net> (raw)
In-Reply-To: <20000816192012.K19260@redhat.com> (sct@redhat.com)
Drivers which do DMA but only to <4GB addresses need bounce
buffers.
This is only true in an architecture specific sense (ie. x86 systems
are the one's which have this particular restriction).
Which is one of the reasons I wish the bounce buffer stuff went into
the place it belongs, behind the pci_dma API. If we move to a
page+offset model for drivers, we could do exactly this and also
handle cases like ix86 PAE.
Later,
David S. Miller
davem@redhat.com
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next prev parent reply other threads:[~2000-08-16 18:24 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-08-10 17:18 Kanoj Sarcar
2000-08-11 2:24 ` David S. Miller
2000-08-14 0:34 ` Anton Blanchard
2000-08-11 11:50 ` Roman Zippel
2000-08-11 13:20 ` Russell King
2000-08-11 14:56 ` Roman Zippel
2000-08-12 9:18 ` Bjorn Wesen
2000-08-11 17:21 ` Kanoj Sarcar
2000-08-14 9:29 ` Roman Zippel
2000-08-15 16:19 ` Stephen C. Tweedie
2000-08-16 8:25 ` Roman Zippel
2000-08-16 17:13 ` Kanoj Sarcar
2000-08-16 18:20 ` Stephen C. Tweedie
2000-08-16 18:24 ` David S. Miller [this message]
2000-08-16 19:53 ` Stephen C. Tweedie
2000-08-16 18:47 ` Kanoj Sarcar
2000-08-16 18:39 ` David S. Miller
2000-08-16 19:30 ` Stephen C. Tweedie
2000-08-16 22:22 ` Kanoj Sarcar
2000-08-17 9:11 ` Stephen C. Tweedie
2000-08-17 19:07 ` Kanoj Sarcar
2000-08-17 19:01 ` David S. Miller
2000-08-17 19:19 ` Alan Cox
2000-08-17 19:20 ` David S. Miller
2000-08-17 19:33 ` Alan Cox
2000-08-17 19:36 ` Kanoj Sarcar
2000-09-07 14:31 ` Ralf Baechle
2000-08-17 19:50 ` Kanoj Sarcar
2000-08-17 19:41 ` David S. Miller
2000-09-07 14:26 ` Ralf Baechle
2000-08-17 19:56 ` Alan Cox
2000-08-17 19:24 ` Alan Cox
2000-08-17 19:32 ` Kanoj Sarcar
2000-08-17 19:30 ` David S. Miller
2000-08-17 20:00 ` Kanoj Sarcar
2000-08-16 18:17 ` Stephen C. Tweedie
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