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arch/x86/include/asm/timer.h: #define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */ static inline unsigned long long __cycles_2_ns(unsigned long long cyc) { int cpu = smp_processor_id(); unsigned long long ns = per_cpu(cyc2ns_offset, cpu); ns += cyc * per_cpu(cyc2ns, cpu) >> CYC2NS_SCALE_FACTOR; // !!! return ns; } Apparently he or she was not very 'careful' to chose CYC2NS_SCALE_FACTOR. cyc
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