From: Jeremy Rosen <Jeremy.Rosen@au.thalesgroup.com>
To: linuxppc-embedded@lists.linuxppc.org
Subject: Re: Workaround for USB DMA bugs
Date: Thu, 04 Apr 2002 14:19:11 +1000 [thread overview]
Message-ID: <scac60f5.069@au.thalesgroup.com> (raw)
>I guess if we can ensure a DMA-only pool, simple alignment will work.
>You just can't kmalloc() because you don't know what may follow
something
>that isn't modulo cache line size. You also have to be careful of
code
>that allocates a large object, then uses part of it for DMA and other
>parts for processor core data. I'm not sure we want to require
kmalloc()
>to always cache align due to the potential for wasted memory space.
can't we use the __GFP_DMA flag to specify that the area must have
algnment enforced ?
or did I misunderstand the use of this flag ?
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next reply other threads:[~2002-04-04 4:19 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-04 4:19 Jeremy Rosen [this message]
2002-04-04 6:16 ` Workaround for USB DMA bugs Dan Malek
2002-04-04 6:32 ` David Gibson
-- strict thread matches above, loose matches on Subject: below --
2002-04-04 6:40 Rosen Jeremy
2002-04-04 6:52 ` David Gibson
2002-04-03 2:43 David Gibson
2002-04-03 8:17 ` Armin
2002-04-03 17:39 ` Frank Rowand
2002-04-03 17:49 ` Dan Malek
2002-04-03 20:43 ` David Blythe
2002-04-03 23:34 ` David Gibson
2002-04-03 9:45 ` "David Müller (ELSOFT AG)"
2002-04-03 23:35 ` David Gibson
2002-04-03 17:42 ` Dan Malek
2002-04-03 23:40 ` David Gibson
2002-04-04 2:54 ` Dan Malek
2002-04-04 3:48 ` David Gibson
2002-04-04 4:09 ` Dan Malek
2002-04-04 5:23 ` David Gibson
2002-04-04 6:08 ` Dan Malek
2002-04-04 6:30 ` David Gibson
2002-04-04 20:21 ` David Blythe
2002-04-04 12:35 ` Brad Parker
2002-04-04 14:12 ` Dan Malek
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