MIPS: page.h: Provide more readable definition for PAGE_MASK.

#define PAGE_SHIFT	16

#endif

#define PAGE_SIZE	(_AC(1,UL) << PAGE_SHIFT)

#define PAGE_MASK       (~((1 << PAGE_SHIFT) - 1))

#define PAGE_MASK       (~(PAGE_SIZE - 1))

#ifdef CONFIG_HUGETLB_PAGE

#define HPAGE_SHIFT	(PAGE_SHIFT + PAGE_SHIFT - 3)