[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>

diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 3bb221d..5fa3c67 100644 (file)
--- 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 a56df7b..5faacbb 100644 (file)
--- 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 e922a88..e2e9df3 100644 (file)
--- 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 ccc4a7f..9103984 100644 (file)
--- 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

diff --git a/mm/Kconfig b/mm/Kconfig
index e76c023..8391729 100644 (file)
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -115,7 +115,7 @@ config SPARSEMEM_EXTREME
 # eventually, we can have this option just 'select SPARSEMEM'
 config MEMORY_HOTPLUG
        bool "Allow for memory hot-add"
-       depends on SPARSEMEM && HOTPLUG && !SOFTWARE_SUSPEND
+       depends on SPARSEMEM && HOTPLUG && !SOFTWARE_SUSPEND && ARCH_ENABLE_MEMORY_HOTPLUG
        depends on (IA64 || X86 || PPC64)
 
 comment "Memory hotplug is currently incompatible with Software Suspend"