[PATCH] jffs2 summary allocation
David Brownell
david-b at pacbell.net
Fri Apr 4 19:09:40 EDT 2008
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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