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The UML port uses 4 and 5 level fixups to support higher level page table directories in the generic VM code. Implement primitives necessary for the 4th level folding, add walks of p4d level where appropriate and drop usage of __ARCH_USE_5LEVEL_HACK. Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Mike Rapoport <[email protected]> Cc: Anatoly Pugachev <[email protected]> Cc: Anton Ivanov <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: "David S. Miller" <[email protected]> Cc: Geert Uytterhoeven <[email protected]> Cc: Greentime Hu <[email protected]> Cc: Greg Ungerer <[email protected]> Cc: Helge Deller <[email protected]> Cc: "James E.J. Bottomley" <[email protected]> Cc: Jeff Dike <[email protected]> Cc: "Kirill A. Shutemov" <[email protected]> Cc: Mark Salter <[email protected]> Cc: Matt Turner <[email protected]> Cc: Michal Simek <[email protected]> Cc: Peter Rosin <[email protected]> Cc: Richard Weinberger <[email protected]> Cc: Rolf Eike Beer <[email protected]> Cc: Russell King <[email protected]> Cc: Russell King <[email protected]> Cc: Sam Creasey <[email protected]> Cc: Vincent Chen <[email protected]> Cc: Vineet Gupta <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>