Linux内核编译错误：未定义引用`__udivdi3’和`__umoddi3′

drivers/built-in.o: In function `gem_rxmac_reset':
clkdev.c:(.text+0x212238): undefined reference to `__bad_udelay'
drivers/built-in.o: In function `divide.part.4':
clkdev.c:(.text.unlikely+0x7214): undefined reference to `__udivdi3'
clkdev.c:(.text.unlikely+0x7244): undefined reference to `__umoddi3'

我用Google搜索并找到了这个补丁：https://lkml.org/lkml/2008/4/7/82

--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -174,6 +174,10 @@ static inline void timespec_add_ns(struct timespec *a,u64 ns)
 {
        ns += a->tv_nsec;
        while(unlikely(ns >= NSEC_PER_SEC)) {
+               /* The following asm() prevents the compiler from
+                * optimising this loop into a modulo operation.  */
+               asm("" : "+r"(ns));
+
                ns -= NSEC_PER_SEc;
                a->tv_sec++;
        }

但未能申请(可能是由于新版本的文件).

patching file linux/time.h
     Hunk #1 Failed at 174.
     1 out of 1 hunk Failed -- saving rejects to file linux/time.h.rej

令人惊讶的是,文件time.h.rej不存在！