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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] usb/mcs7830: Don't use buffers from stack for USB
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Date: Tue, 20 Jan 2009 15:39:14 -0800 (PST)
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From: Arnd Bergmann <arnd@arndb.de>
Date: Wed, 21 Jan 2009 00:37:51 +0100

> On a related topic, can we put something in place that can check for
> this error at run-time, like a WARN_ON(is_kernel_stack(addr)) in
> dma_map_single?

That would be something for the DMA API debugging patches that
have been floating around lately.