Linux kernel compilation error: undefined reference to `__udivdi3' & `__umoddi3' - linux

Question

Here is the error I've got:
http://pastebin.com/VadUW6fy
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'
I googled and found this patch: 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++;
}
but failed to apply (may be due to new version of the file).
patching file linux/time.h
Hunk #1 FAILED at 174.
1 out of 1 hunk FAILED -- saving rejects to file linux/time.h.rej
surprisingly, the file time.h.rej is not present!

Answer 1

I should have read more closely. The patch is for timespec_add_ns(), and you have gem_rxmac_reset() and divide.part.4 functions failing. Probably unrelated to the patch you found -- instead, probably standard 64-bit div / mod functions don't have an implementation on your target platform.
Do you have a Sun GEM or Apple GMAC NIC? If not, you can probably just disable that driver and get rid of the first error message.
For the second, you might need to implement a similar asm trick in the clkdev.c file -- when I skimmed my copy for a repeated subtraction operation I didn't spot one -- but maybe you can simply steal a newer clkdev.c or clkdev.h to fix this problem? (It's a long shot, there's only one entry in git log drivers/clk/clkdev.c.)