MAX_LOW_PFN        30 arch/xtensa/include/asm/page.h #define MAX_LOW_PFN	(PHYS_PFN(XCHAL_KSEG_PADDR) + \
MAX_LOW_PFN        35 arch/xtensa/include/asm/page.h #define MAX_LOW_PFN	PHYS_PFN(0xfffffffful)