On Mon, 20 Aug 2007 22:03:28 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:

quoted text
> register_hotcpu_notifier() is cunning.  If CONFIG_HOTPLUG_CPU=y, we need
> the notifier block and the function to which it points to be in .data and
> in .text.  If CONFIG_HOTPLUG_CPU=n, we don't need them to be present at all.
> 
> So what we can do is to just leave the notifier block in .data and the
> function in .text and then the compiler/linker will notice that nothing
> references them and they will be omitted at build time.

As long as the notifier block and the function are static.  I don't think
the toolchain is smart enough to remove them if they have global scope,
but I didn't check this..
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