cmpxchg() in recent kernels

[Aras Vaichas]

On 9 October 2010 20:32, Alex Sverdlin <alex at gai.ru> wrote:
>
> Hello!
>
> I've probably missed something, but how to compile recent kernels on ARM?
> I've been using GCC 3.4.3 from Cirrus for my EP9302 boards up to 2.6.35.4
> But 2.6.36-rc and upper won't compile anymore.
> The problem is appearing in multiplatform code of cmpxchg() function.
> First in kernel/pid.c (2.6.36-rc4 - 2.6.36-rc6)
> Then 4 times in 2.6.36-rc7-next... atomic_cmpxchg compiles fine, and when I
> replace cmpxhg with atomic_ version, everything compiles fine.
>
> Here is output of make from 2.6.36-rc7-next:
> ...
>  CHK     include/generated/compile.h
>  UPD     include/generated/compile.h
>  CC      init/version.o
>  LD      init/built-in.o
>  LD      vmlinux
> kernel/built-in.o: In function `alloc_pid':
> elfcore.c:(.text+0x1c258): undefined reference to `wrong_size_cmpxchg'
> net/built-in.o: In function `rt_bind_peer':
> sysctl_net.c:(.text+0x3bb38): undefined reference to `wrong_size_cmpxchg'
> net/built-in.o: In function `inet_add_protocol':
> sysctl_net.c:(.text+0x3f4dc): undefined reference to `wrong_size_cmpxchg'
> net/built-in.o: In function `inet_del_protocol':
> sysctl_net.c:(.text+0x3f5a8): undefined reference to `wrong_size_cmpxchg'
> net/built-in.o: In function `build_ehash_secret':
> sysctl_net.c:(.text+0x6a034): undefined reference to `wrong_size_cmpxchg'
> make[1]: *** [vmlinux] Error 1
> ...

Sorry, no answer, but I can confirm that I am having the same problem as well.
ARM AT91RM9200, 2.6.33.7 + at91 + rt

kernel/built-in.o: In function `__tasklet_hi_schedule':
utsname_sysctl.c:(.text+0xca1c): undefined reference to `wrong_size_cmpxchg'
kernel/built-in.o: In function `__tasklet_schedule':
utsname_sysctl.c:(.text+0xcb7c): undefined reference to `wrong_size_cmpxchg'
kernel/built-in.o: In function `__tasklet_action':
utsname_sysctl.c:(.text+0xce4c): undefined reference to `wrong_size_cmpxchg'
kernel/built-in.o: In function `sched_init_smp':
utsname_sysctl.c:(.init.text+0xec): undefined reference to `____ilog2_NaN'
make: *** [.tmp_vmlinux1] Error 1

also

kernel/built-in.o: In function `__tasklet_hi_schedule':
slow-work.c:(.text+0xc86c): undefined reference to `wrong_size_cmpxchg'
kernel/built-in.o: In function `__tasklet_schedule':
slow-work.c:(.text+0xc9cc): undefined reference to `wrong_size_cmpxchg'
kernel/built-in.o: In function `__tasklet_action':
slow-work.c:(.text+0xcc9c): undefined reference to `wrong_size_cmpxchg'
kernel/built-in.o: In function `sched_init_smp':
slow-work.c:(.init.text+0xec): undefined reference to `____ilog2_NaN'
make: *** [.tmp_vmlinux1] Error 1

Aras