linux-kernel - [PATCH] powerpc: Fix build failure when MEMORY

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Message-Id: <1408482065-18457-1-git-send-email-bobby.prani@gmail.com>
Date:	Tue, 19 Aug 2014 17:01:05 -0400
From:	Pranith Kumar <bobby.prani@...il.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	linuxppc-dev@...ts.ozlabs.org (open list:LINUX FOR POWERPC...),
	linux-kernel@...r.kernel.org (open list)
Cc:	Andew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] powerpc: Fix build failure when MEMORY_HOTPLUG=y

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@...il.com>
CC: Andew Morton <akpm@...ux-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

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