linux kernel编译 undefined reference to `__ae

最新推荐文章于 2025-06-28 19:00:21 发布

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最新推荐文章于 2025-06-28 19:00:21 发布

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分类专栏： Linux

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在32位CPU上，Linux不提供64位除法的快速实现，导致编译时出现undefined reference错误。为避免慢速代码，需要使用特定的库函数来执行64位除法操作。

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问题代码

 ktime_t calltime, delta, rettime;
 unsigned long long duration;

 calltime = ktime_get();


/*获取当前时间*/
rettime = ktime_get();
/*计算时间差 ktime_sub(A,B) 计算A-B的时间差 返回纳秒*/
delta = ktime_sub(rettime,calltime);
/*转换成微秒*/
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__);

编译出错

/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

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