From: Arjan van de Ven <arjan@infradead.org>
To: Mark Underwood <basicmark@yahoo.com>
Cc: David Brownell <david-b@pacbell.net>,
linux-kernel@vger.kernel.org, dpervushin@ru.mvista.com
Subject: Re: [RFC][PATCH] SPI subsystem
Date: Mon, 03 Oct 2005 13:07:36 +0200 [thread overview]
Message-ID: <1128337656.17024.10.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <20051003105748.213.qmail@web33014.mail.mud.yahoo.com>
On Mon, 2005-10-03 at 11:57 +0100, Mark Underwood wrote:
> > > > > Hmm, using local variables for messages, so DMA adapter drivers have
> > > > > to check if this is non-kmalloc'ed space (how?)
> > > >
> > > > They can't check that. It turns out that most current Linuxes
> > > > have no issues DMAing a few bytes from the stack.
> > >
> > > Will the DMA remapping calls work with data from the stack?
> >
> > On "most current Linuxes" yes. All I know about, in fact.
> > But it's not guaranteed.
>
> OK. Thanks
please NEVER EVER do dma from or to a stack variable. It's not allowed
on all architectures and it is really really bad practice in general
anyway.
next prev parent reply other threads:[~2005-10-03 11:07 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-03 10:13 Mark Underwood
2005-09-09 21:39 ` David Brownell
2005-09-10 11:17 ` Mark Underwood
2005-09-15 0:08 ` David Brownell
2005-09-15 19:24 ` Mark Underwood
2005-09-15 22:14 ` David Brownell
2005-09-15 23:27 ` Mark Underwood
2005-09-16 3:25 ` David Brownell
2005-09-16 17:55 ` Mark Underwood
2005-09-16 18:43 ` David Brownell
2005-09-18 14:45 ` Mark Underwood
2005-09-30 1:02 ` David Brownell
2005-10-02 12:36 ` Mark Underwood
2005-10-03 4:47 ` David Brownell
2005-10-03 10:57 ` Mark Underwood
2005-10-03 11:07 ` Arjan van de Ven [this message]
2005-10-03 15:14 ` David Brownell
2005-10-03 15:23 ` Russell King
2005-10-03 15:40 ` David Brownell
2005-09-10 10:55 ` Vital
2005-09-10 11:54 ` Mark Underwood
2005-09-10 21:20 ` Vital
2005-09-11 8:35 ` Mark Underwood
2005-09-15 0:14 ` David Brownell
2005-09-26 16:50 ` Vitaly Wool
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