mm: Fix memory/cpu hotplug section mismatch and oops.

mm: Fix memory/cpu hotplug section mismatch and oops.

When building with memory hotplug enabled and cpu hotplug disabled, we
end up with the following section mismatch:

WARNING: mm/built-in.o(.text+0x4e58): Section mismatch: reference to
.init.text: (between 'free_area_init_node' and '__build_all_zonelists')

This happens as a result of:

        -> free_area_init_node()
          -> free_area_init_core()
            -> zone_pcp_init() <-- all __meminit up to this point
              -> zone_batchsize() <-- marked as __cpuinit                     fo

This happens because CONFIG_HOTPLUG_CPU=n sets __cpuinit to __init, but
CONFIG_MEMORY_HOTPLUG=y unsets __meminit.

Changing zone_batchsize() to __devinit fixes this.

__devinit is the only thing that is common between CONFIG_HOTPLUG_CPU=y and
CONFIG_MEMORY_HOTPLUG=y. In the long run, perhaps this should be moved to
another section identifier completely. Without this, memory hot-add
of offline nodes (via hotadd_new_pgdat()) will oops if CPU hotplug is
not also enabled.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
--

 mm/page_alloc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)