No more bits in vm_area_struct's vm_flags.

[Nigel Cunningham]

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.

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..

Regards,

Nigel
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