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36b390fd62
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: 438cc81a41 ("powerpc/pseries: Automatically resize HPT for memory hot add/remove")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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