CA_WRITEBACK       31 arch/xtensa/include/asm/initialize_mmu.h #define CA_WRITEBACK	(_PAGE_CA_WB     | _PAGE_HW_WRITE | _PAGE_HW_EXEC)
CA_WRITEBACK       33 arch/xtensa/include/asm/initialize_mmu.h #define CA_WRITEBACK	(0x4)