From: Dan Malek <dan@embeddededge.com>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: linuxppc-embedded@lists.linuxppc.org
Subject: Re: Workaround for USB DMA bugs
Date: Wed, 03 Apr 2002 21:54:29 -0500 [thread overview]
Message-ID: <3CABC065.6050107@embeddededge.com> (raw)
In-Reply-To: 20020403234051.GG21034@zax
David Gibson wrote:
> It's becoming easier though, with the __cacheline_aligned macro. Plus
> I think if the buffer is individually kmalloc()ed it will be properly
> aligned.
Alignment is only half the problem. You have to ensure the object is
modulo cache line size as well. You can't be sharing cache lines subject
to DMA with other DMA or processor core data.
-- Dan
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-04-04 2:54 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-03 2:43 Workaround for USB DMA bugs 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 [this message]
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
-- strict thread matches above, loose matches on Subject: below --
2002-04-04 4:19 Jeremy Rosen
2002-04-04 6:16 ` Dan Malek
2002-04-04 6:32 ` David Gibson
2002-04-04 6:40 Rosen Jeremy
2002-04-04 6:52 ` David Gibson
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