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PTRS_PER_PGD28include/asm-alpha/pgtable.h#define PTRS_PER_PGD  (1UL << (PAGE_SHIFT-3))
PTRS_PER_PGD30include/asm-i386/pgtable.h#define PTRS_PER_PGD  1024
PTRS_PER_PGD28include/asm-sparc/pgtable.h#define PTRS_PER_PGD    1024