powerpc/mm: Fix build break with BOOK3S_64=n and MEMORY_HOTPLUG=y

[Michael Ellerman]

On Wed, 2017-02-15 at 10:54:37 UTC, Michael Ellerman wrote:
> The recently merged HPT (Hash Page Table) resize support broke the build
> when BOOK3S_64=n (ie. 32-bit or 64-bit Book3E) and MEMORY_HOTPLUG=y:
> 
>   arch/powerpc/mm/mem.o: In function `.arch_add_memory':
>   (.text+0x4e4): undefined reference to `.resize_hpt_for_hotplug'
> 
> Fix it by adding a dummy version.
> 
> Fixes: 438cc81a41e8 ("powerpc/pseries: Automatically resize HPT for memory hot add/remove")
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>

Applied to powerpc next.

https://git.kernel.org/powerpc/c/36b390fd624a7f3a64bda5de54fa58

cheers