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    SubjectRe: Generic DMA - BUG_ON
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    On Wed, 2010-01-20 at 12:00 +0100, Joerg Roedel wrote:
    > On Wed, Jan 20, 2010 at 10:53:50AM +0000, Russell King wrote:
    > > and ops is NULL, then this code will oops; you will get a full register
    > > dump and backtrace. You can use this information along with markup_oops.pl
    > > to find out where the problem is.
    >
    > You can't rely on the oops if the code runs in process context. The
    > process may have address 0 mapped which would result in a security hole.
    > We had two of these bugs last year.

    You also can't rely on an oops in a NOMMU environment.

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