On Wed, Jan 26, 2011 at 05:25:35PM +0000, Dave P. Martin wrote:

SMP_ON_UP fixups lead to vmlinux link errors if those sections are
discarded at link-time.  In particular this may happen for built-in
__exit stuff.

This patch modifies the vmlinux linker script to reduce the amount
of discarded sections, and tries to make sure that __exit sections
are kept in.

This is a hack and probably wrong!  Further discussion is needed.  

Can you send the configuration which you see this problem with?
I've tried to build a kernel which inlines the spinlocks, but I find
that's not possible, so I'm doubting whether any fix is required for
mainline.