Main MIPS changes for v5.4:

- boot_mem_map is removed, providing a nice cleanup made possible by the
  recent removal of bootmem.

- Some fixes to atomics, in general providing compiler barriers for
  smp_mb__{before,after}_atomic plus fixes specific to Loongson CPUs or
  MIPS32 systems using cmpxchg64().

- Conversion to the new generic VDSO infrastructure courtesy of Vincenzo
  Frascino.

- Removal of undefined behavior in set_io_port_base(), fixing the
  behavior of some MIPS kernel configurations when built with recent
  clang versions.

- Initial MIPS32 huge page support, functional on at least Ingenic SoCs.

- pte_special() is now supported for some configurations, allowing among
  other things generic fast GUP to be used.

- Miscellaneous fixes & cleanups.

And platform specific changes:

- Major improvements to Ingenic SoC support from Paul Cercueil, mostly
  enabled by the inclusion of the new TCU (timer-counter unit) drivers
  he's spent a very patient year or so working on. Plus some fixes for
  X1000 SoCs from Zhou Yanjie.

- Netgear R6200 v1 systems are now supported by the bcm47xx platform.

- DT updates for BMIPS, Lantiq & Microsemi Ocelot systems.
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