pmd_t             282 arch/x86/include/asm/pgtable_types.h typedef struct { pmdval_t pmd; } pmd_t;
pmd_t              44 include/asm-generic/page.h } pmd_t;
pmd_t              17 include/asm-generic/pgtable-nopmd.h typedef struct { pud_t pud; } pmd_t;