[PATCH] powerpc: Fix build failure when MEMORY_HOTPLUG=y

[Pranith Kumar]

ARCH_ENABLE_MEMORY_HOTPLUG is enabled by default for powerpc. This causes build
failures when SPARSEMEM=n as memory hotplug needs definition which are defined
only when SPARSEMEM=y. The error is as follows:

arch/powerpc/platforms/pseries/hotplug-memory.c:27:31: error: 'SECTION_SIZE_BITS' undeclared (first use in this function)
arch/powerpc/platforms/pseries/hotplug-memory.c:27:31: note: each undeclared identifier is reported only once for each function it appears in
arch/powerpc/platforms/pseries/hotplug-memory.c: In function 'pseries_remove_memblock':
arch/powerpc/platforms/pseries/hotplug-memory.c:98:34: error: 'SECTION_SIZE_BITS' undeclared (first use in this function)
make[2]: *** [arch/powerpc/platforms/pseries/hotplug-memory.o] Error 1

Signed-off-by: Pranith Kumar <bobby.prani at gmail.com>
CC: Andew Morton <akpm at linux-foundation.org>
---
 arch/powerpc/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 9c1aa77..da16ffe 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -383,6 +383,7 @@ config ARCH_CPU_PROBE_RELEASE
 
 config ARCH_ENABLE_MEMORY_HOTPLUG
 	def_bool y
+	depends on SPARSEMEM
 
 config ARCH_HAS_WALK_MEMORY
 	def_bool y
-- 
1.9.1