_PAGE_C_MASK      307 arch/nds32/include/asm/pgtable.h #define pgprot_noncached(prot)	   __pgprot((pgprot_val(prot)&~_PAGE_C_MASK) | _PAGE_C_DEV)
_PAGE_C_MASK      308 arch/nds32/include/asm/pgtable.h #define pgprot_writecombine(prot)  __pgprot((pgprot_val(prot)&~_PAGE_C_MASK) | _PAGE_C_DEV_WB)