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    SubjectRe: + futex-runtime-enable-pi-and-robust-functionality.patch added to -mm tree
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    On Thu, 2008-03-27 at 14:48 +1100, Benjamin Herrenschmidt wrote:
    > On Thu, 2008-03-27 at 14:32 +1100, Benjamin Herrenschmidt wrote:
    > > > Hmm, not sure whether there is such code, but then it would be not too bad
    > > > to add
    > > >
    > > > if (!p)
    > > > return -EFAULT;
    > > >
    > > > to the S390 implementations which only read data and have an exception
    > > > fixup.
    > >
    > > I have a different problem on some embedded powerpc's where the TLB miss
    > > code isn't checking for the cached pgdir pointer being NULL (which
    > > happens because we are early at boot and haven't activated an mm). So we
    > > end up either taking recursive faults or going into lalaland walking
    > > the page tables.
    > >
    > > It happens on some unreleased code, I'll verify if it happens on
    > > 8xx/4xx/etc... in a minute, and will cook a patch if it does.
    >
    > Ok, so everything released seems to be fine. It will use swapper_pg_dir
    > which on 32 bits will do the right thing. Pfiew ! So only some stuff I'm
    > still working on breaks, I'll fix it.

    I try to test at least the -rc releases on 4xx as they come out, if not
    a daily git update, and this never bit on 4xx for the reasons you
    stated. Glad we have similar results.

    josh



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