undefined references to __udivdi3 on powerpc

undefined references to __udivdi3 on powerpc

[Olaf Hering]

While debugging __divdi3 calls in drivers/crypto/hifn_795x.c (due to the
ndelay() delay call with a s64), I found even more breakage of that
sort. This is after a allnoconfig with ARCH=powerpc in 2.6.25-rc3,
plus CONFIG_MODULES=y and CONFIG_CRYPTO_DEV_HIFN_795X=y:

  LD      .tmp_vmlinux1
  kernel/built-in.o: In function `update_xtime_cache':
  (.text+0x221a0): undefined reference to `__umoddi3'
  kernel/built-in.o: In function `update_xtime_cache':
  (.text+0x221c0): undefined reference to `__udivdi3'
  kernel/built-in.o: In function `getnstimeofday':
  (.text+0x22330): undefined reference to `__umoddi3'
  kernel/built-in.o: In function `getnstimeofday':
  (.text+0x22350): undefined reference to `__udivdi3'
  kernel/built-in.o: In function `timekeeping_resume':
  timekeeping.c:(.text+0x226a0): undefined reference to `__udivdi3'
  timekeeping.c:(.text+0x22778): undefined reference to `__umoddi3'
  timekeeping.c:(.text+0x22798): undefined reference to `__udivdi3'
  kernel/built-in.o: In function `update_wall_time':
  (.text+0x22c7c): undefined reference to `__umoddi3'
  kernel/built-in.o: In function `update_wall_time':
  (.text+0x22c9c): undefined reference to `__udivdi3'
  kernel/built-in.o: In function `update_wall_time':
  (.text+0x230f8): undefined reference to `__umoddi3'
  kernel/built-in.o: In function `update_wall_time':
  (.text+0x23118): undefined reference to `__udivdi3'
  kernel/built-in.o: In function `do_settimeofday':
  (.text+0x23520): undefined reference to `__udivdi3'
  kernel/built-in.o: In function `timekeeping_init':
  (.init.text+0x1870): undefined reference to `__udivdi3'
  make[1]: *** [.tmp_vmlinux1] Error 1

But its not a regression, 2.6.24 allnoconfig does not link either on
powerpc32. 

How can this be fixed?

Olaf

Re: undefined references to __udivdi3 on powerpc

[Segher Boessenkool]

> While debugging __divdi3 calls in drivers/crypto/hifn_795x.c (due to 
> the
> ndelay() delay call with a s64), I found even more breakage of that
> sort. This is after a allnoconfig with ARCH=powerpc in 2.6.25-rc3,
> plus CONFIG_MODULES=y and CONFIG_CRYPTO_DEV_HIFN_795X=y:

I cannot reproduce this, but my tree has

	time: prevent the loop in timespec_add_ns() from being optimised away

which is in -mm now.  Could you try that patch?


Segher

Re: undefined references to __udivdi3 on powerpc

[Olaf Hering]

On Thu, Feb 28, Segher Boessenkool wrote:

>> While debugging __divdi3 calls in drivers/crypto/hifn_795x.c (due to the
>> ndelay() delay call with a s64), I found even more breakage of that
>> sort. This is after a allnoconfig with ARCH=powerpc in 2.6.25-rc3,
>> plus CONFIG_MODULES=y and CONFIG_CRYPTO_DEV_HIFN_795X=y:
>
> I cannot reproduce this, but my tree has
>
> 	time: prevent the loop in timespec_add_ns() from being optimised away
>
> which is in -mm now.  Could you try that patch?

Yes, this patch fixes it.
Thanks.

Re: undefined references to __udivdi3 on powerpc

[Adrian Bunk]

On Thu, Feb 28, 2008 at 02:37:18PM +0100, Olaf Hering wrote:
> 
> While debugging __divdi3 calls in drivers/crypto/hifn_795x.c (due to the
> ndelay() delay call with a s64), I found even more breakage of that
> sort. This is after a allnoconfig with ARCH=powerpc in 2.6.25-rc3,
> plus CONFIG_MODULES=y and CONFIG_CRYPTO_DEV_HIFN_795X=y:
> 
>   LD      .tmp_vmlinux1
>   kernel/built-in.o: In function `update_xtime_cache':
>   (.text+0x221a0): undefined reference to `__umoddi3'
>   kernel/built-in.o: In function `update_xtime_cache':
>   (.text+0x221c0): undefined reference to `__udivdi3'
>   kernel/built-in.o: In function `getnstimeofday':
>   (.text+0x22330): undefined reference to `__umoddi3'
>   kernel/built-in.o: In function `getnstimeofday':
>   (.text+0x22350): undefined reference to `__udivdi3'
>   kernel/built-in.o: In function `timekeeping_resume':
>   timekeeping.c:(.text+0x226a0): undefined reference to `__udivdi3'
>   timekeeping.c:(.text+0x22778): undefined reference to `__umoddi3'
>   timekeeping.c:(.text+0x22798): undefined reference to `__udivdi3'
>   kernel/built-in.o: In function `update_wall_time':
>   (.text+0x22c7c): undefined reference to `__umoddi3'
>   kernel/built-in.o: In function `update_wall_time':
>   (.text+0x22c9c): undefined reference to `__udivdi3'
>   kernel/built-in.o: In function `update_wall_time':
>   (.text+0x230f8): undefined reference to `__umoddi3'
>   kernel/built-in.o: In function `update_wall_time':
>   (.text+0x23118): undefined reference to `__udivdi3'
>   kernel/built-in.o: In function `do_settimeofday':
>   (.text+0x23520): undefined reference to `__udivdi3'
>   kernel/built-in.o: In function `timekeeping_init':
>   (.init.text+0x1870): undefined reference to `__udivdi3'
>   make[1]: *** [.tmp_vmlinux1] Error 1
> 
> But its not a regression, 2.6.24 allnoconfig does not link either on
> powerpc32. 
>...

You didn't mention your gcc version, but you should only get these 
errors when using the not yet released gcc 4.3.

And this issue is known for at about half a year.

> Olaf

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed