Messages in this thread | | | From | David Brownell <> | Subject | Re: [PATCH] jffs2 summary allocation | Date | Fri, 4 Apr 2008 16:09:40 -0700 |
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On Friday 04 April 2008, Andrew Morton wrote:
> I'm assuming from the trace that the arm code tried to put that memory > under DMA (or at least, passed it into part of the DMA management code to > get the various caches sorted out) and that the arm DMA support code > doesn't like being given vmalloced memory.
Actually, Documentation/DMA-Mapping.txt has a section right up front called "What memory is DMA'able?" ... which despite its ungrammatical title, says clearly:
... This means specifically that you may _not_ use the memory/addresses returned from vmalloc() for DMA. ...
So I'm rather surprised to see *ANY* kernel code trying to do that. That rule has been in effect for many, many years now.
- Dave
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