[PATCH] solve config broken: undefined reference to `online_page'

Memory hotplug code of i386 adds memory to only highmem.  So, if
CONFIG_HIGHMEM is not set, CONFIG_MEMORY_HOTPLUG shouldn't be set.
Otherwise, it causes compile error.

In addition, many architecture can't use memory hotplug feature yet.  So, I
introduce CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG.

Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 11 insertions, 0 deletions

diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 3bb221db164a..5fa3c671c937 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -794,6 +794,9 @@ config COMPAT_VDSO
 
 endmenu
 
+config ARCH_ENABLE_MEMORY_HOTPLUG
+        def_bool y
+        depends on HIGHMEM
 
 menu "Power management options (ACPI, APM)"
         depends on !X86_VOYAGER
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index a56df7bf022d..5faacbb8d16c 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -271,6 +271,9 @@ config HOTPLUG_CPU
           can be controlled through /sys/devices/system/cpu/cpu#.
           Say N if you want to disable CPU hotplug.
 
+config ARCH_ENABLE_MEMORY_HOTPLUG
+        def_bool y
+
 config SCHED_SMT
         bool "SMT scheduler support"
         depends on SMP
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index e922a88b2bad..e2e9df344ab7 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -618,6 +618,9 @@ config HOTPLUG_CPU
 
           Say N if you are unsure.
 
+config ARCH_ENABLE_MEMORY_HOTPLUG
+        def_bool y
+
 config KEXEC
         bool "kexec system call (EXPERIMENTAL)"
         depends on PPC_MULTIPLATFORM && EXPERIMENTAL
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index ccc4a7fb97a3..91039844820c 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -370,6 +370,8 @@ config HOTPLUG_CPU
                 can be controlled through /sys/devices/system/cpu/cpu#.
                 Say N if you want to disable CPU hotplug.
 
+config ARCH_ENABLE_MEMORY_HOTPLUG
+        def_bool y
 
 config HPET_TIMER
         bool