__phys_addr
unsigned long __phys_addr(unsigned long x, bool is_31bit);
#define __pa(x) __phys_addr((unsigned long)(x), false)
#define __pa32(x) __phys_addr((unsigned long)(x), true)
EXPORT_SYMBOL(__phys_addr);
#define __pa(x) __phys_addr((unsigned long)(x))
extern unsigned long __phys_addr(unsigned long);
#define __phys_addr_symbol(x) __phys_addr(x)
extern unsigned long __phys_addr(unsigned long);
EXPORT_SYMBOL(__phys_addr);
EXPORT_SYMBOL(__phys_addr);