#if !defined(CONfig_MMU)#define virt_to_phys(address) ((unsigned long)(address))#define phys_to_virt(address) ((voID *)(address))#else#define virt_to_phys(address) (__pa(address))#define phys_to_virt(address) (__va(address))#endif
而且__va
#define __va(x) ((voID *)((unsigned long) (x)))
如果未定义CONfig_MMU则等于.
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