pmd_set_fixmap    563 arch/arm64/include/asm/pgtable.h #define pmd_set_fixmap(addr)		((pmd_t *)set_fixmap_offset(FIX_PMD, addr))
pmd_set_fixmap    577 arch/arm64/include/asm/pgtable.h #define pmd_set_fixmap(addr)		NULL