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    SubjectRe: [PATCH] jffs2 summary allocation
    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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