問題代碼

ktime_t calltime, delta, rettime;unsigned long long duration;calltime = ktime_get();/*獲取當前時間*/ rettime = ktime_get(); /*計算時間差 ktime_sub(A,B) 計算A-B的時間差 返回納秒*/ delta = ktime_sub(rettime,calltime); /*轉換成微秒*/ duration = (unsigned long long) ktime_to_ns(delta) >> 10; printk("[%s] running %lld usecs %d ms at %d\n",__FUNCTION__, duration,(unsigned int)(duration/1000),__LINE__);

 

編譯出錯

/rk3288_pad/kernel/drivers/input/sensors/sensor-dev.c:505: undefined reference to `__aeabi_uldivmod' /data/weiqifa/rk3288_pad/kernel/drivers/input/sensors/sensor-dev.c:529: undefined reference to `__aeabi_uldivmod' Makefile:997: recipe for target 'vmlinux' failed make: *** [vmlinux] Error 1

 

原因

在大多數(shù)32位CPU上，必須使用慢庫函數(shù)實現(xiàn)64位除法。為了防止編譯器生成非常慢的代碼，Linux不實現(xiàn)這些功能。

總結

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