error: implicit declaration of function 'rcu_dereference' - current -git fails to build

["Jesper Juhl" <jesper.juhl@gmail.com>]

I get this build error with the current mainline git tree.
Let me know if further details are needed...

...
In file included from include/linux/sched.h:75,
                 from include/linux/smp_lock.h:5,
                 from include/linux/hardirq.h:5,
                 from include/linux/slub_def.h:13,
                 from include/linux/slab.h:116,
                 from include/linux/percpu.h:5,
                 from include/linux/rcupdate.h:41,
                 from include/linux/key.h:21,
                 from include/linux/syscalls.h:67,
                 from init/noinitramfs.c:23:
include/linux/pid.h:51: error: field 'rcu' has incomplete type
In file included from include/linux/smp_lock.h:5,
                 from include/linux/hardirq.h:5,
                 from include/linux/slub_def.h:13,
                 from include/linux/slab.h:116,
                 from include/linux/percpu.h:5,
                 from include/linux/rcupdate.h:41,
                 from include/linux/key.h:21,
                 from include/linux/syscalls.h:67,
                 from init/noinitramfs.c:23:
include/linux/sched.h:1187: error: field 'rcu' has incomplete type
include/linux/sched.h: In function 'next_thread':
include/linux/sched.h:1650: error: implicit declaration of function
'rcu_dereference'
include/linux/sched.h:1650: warning: initialization makes pointer from
integer without a cast
make[1]: *** [init/noinitramfs.o] Error 1
make: *** [init] Error 2


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Jesper Juhl <jesper.juhl@gmail.com>
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