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    SubjectRe: No more bits in vm_area_struct's vm_flags.
    On Wed, 23 Sep 2009 14:15:18 +1000
    Nigel Cunningham <ncunningham@crca.org.au> wrote:

    > Hi all.
    >
    > With the addition of the VM_MERGEABLE flag to vm_flags post-2.6.31, the
    > last bit in vm_flags has been used.
    >

    Wow...that's bad.



    > I have some code in TuxOnIce that needs a bit too (explicitly mark the
    > VMA as needing to be atomically copied, for GEM objects), and am not
    > sure what the canonical way to proceed is. Should a new unsigned long be
    > added? The difficulty I see with that is that my flag was used in
    > shmem_file_setup's flags parameter (drm_gem_object_alloc), so that
    > function would need an extra parameter too..
    >

    Hmm, how about adding vma->vm_flags2 ?

    Thanks,
    -Kame


    > Regards,
    >
    > Nigel
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