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

Mark Hounschell
2004-05-23T12:58:54Z

Mark Hounschell wrote:
>
> Andrew Morton wrote:
> >
> > 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
>
> Thanks for that. I'll try it.
>
> Mark

Thank you. That definatly fixed my problem. Is fixing this main line
WIP?

Regards
Mark