workqueue cmpxchg() breakage

[Paul Mundt]

The changes in 365970a1ea76d81cb1ad2f652acb605f06dae256 result in
cmpxchg() being invoked with bogus sizes with gcc-4.1 on SH, particularly
when kernel/workqueue.c:set_wq_data() is left inlined:

  LD      .tmp_vmlinux1
kernel/built-in.o: In function `__cmpxchg':
/home/pmundt/devel/git/sh-2.6/include/asm/system.h:247: undefined reference to `__cmpxchg_called_with_bad_pointer'
make: *** [.tmp_vmlinux1] Error 1

If I add a handler for the u64 case, that catches one of the inlined
references, but the other call site generates something completely different,
it's garbage in either case.

Taking set_wq_data() out of line fixes this, but is likely not the right fix.
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