linux/arch/x86/mm/physaddr.h
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   1#include <asm/processor.h>
   2
   3static inline int phys_addr_valid(resource_size_t addr)
   4{
   5#ifdef CONFIG_PHYS_ADDR_T_64BIT
   6        return !(addr >> boot_cpu_data.x86_phys_bits);
   7#else
   8        return 1;
   9#endif
  10}
  11