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SubjectRe: mlockall and mmap of IO devices don't mix
Mark Hounschell <markh@compro.net> wrote:
>
> Joe Korty wrote:
> >
> > 2.6.0-test6: the use of mlockall(2) in a process that has mmap(2)ed
> > the registers of an IO device will hang that process uninterruptibly.
> > The task runs in an infinite loop in get_user_pages(), invoking
> > follow_page() forever.
> >
> > Using binary search I discovered that the problem was introduced
> > in 2.5.14, specifically in ChangeSetKey
> >
> > zippel@linux-m68k.org|ChangeSet|20020503210330|37095
> >
>
> I know this is an old thread but can anyone tell me if this problem is
> resolved in the current 2.6.6 kernel?
>

There's an utterly ancient patch in -mm which might fix this.

http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.6/2.6.6-mm4/broken-out/get_user_pages-handle-VM_IO.patch

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