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In preparation for reducing struct_mutex stranglehold around the vm, make the vma.flags atomic so that we can acquire a pin on the vma atomically before deciding if we need to take the mutex. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190911090243.16786-1-chris@chris-wilson.co.uk