Linux Kernel  3.7.1
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physaddr.h
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1 #include <asm/processor.h>
2 
3 static 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 }
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