mm: make the __PAGETABLE_PxD_FOLDED defines non-empty
Change the currently empty defines for __PAGETABLE_PMD_FOLDED, __PAGETABLE_PUD_FOLDED and __PAGETABLE_P4D_FOLDED to return 1. This makes it possible to use __is_defined() to test if the preprocessor define exists. Acked-by: NKirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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