4cc8daf782
These two functions were largely unrelated, they just used the same same loop logic to walk through a backing object's memq. Pull out the all_shadowed test as its own function and eliminate OBSC_TEST_ALL_SHADOWED. Rename vm_object_backing_scan to vm_object_collapse_scan. No functional change. Sponsored by: EMC / Isilon Storage Division Differential Revision: https://reviews.freebsd.org/D4335