b146ada221c1 ("mm: nobootmem: remove dead code")
355c45affca7 ("mm: remove bootmem allocator implementation.")
b4a991ec584b ("mm: remove CONFIG_NO_BOOTMEM")
ac435075892e ("Merge tag 'csky-for-linus-4.20' of https://github.com/c-sky/csky-linux")