Re: mlockall and mmap of IO devices don't mix

[Mark Hounschell]

Andrew Morton wrote:
> 
> Mark Hounschell <markh@xxxxxxxxxx> 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@xxxxxxxxxxxxxx|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

Thanks for that. I'll try it. 

Mark
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