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    Subject[patch 05/45] memory hotplug: solve config broken: undefined reference to `online_page
    -stable review patch.  If anyone has any objections, please let us know.

    ------------------
    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>
    Signed-off-by: Andrew Morton <akpm@osdl.org>
    Signed-off-by: Linus Torvalds <torvalds@osdl.org>
    Signed-off-by: Chris Wright <chrisw@sous-sol.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    ---
    arch/i386/Kconfig | 3 +++
    arch/ia64/Kconfig | 3 +++
    arch/powerpc/Kconfig | 3 +++
    arch/x86_64/Kconfig | 2 ++
    mm/Kconfig | 2 +-
    5 files changed, 12 insertions(+), 1 deletion(-)

    --- linux-2.6.17.2.orig/arch/i386/Kconfig
    +++ linux-2.6.17.2/arch/i386/Kconfig
    @@ -765,6 +765,9 @@ config HOTPLUG_CPU

    endmenu

    +config ARCH_ENABLE_MEMORY_HOTPLUG
    + def_bool y
    + depends on HIGHMEM

    menu "Power management options (ACPI, APM)"
    depends on !X86_VOYAGER
    --- linux-2.6.17.2.orig/arch/ia64/Kconfig
    +++ linux-2.6.17.2/arch/ia64/Kconfig
    @@ -270,6 +270,9 @@ 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
    --- linux-2.6.17.2.orig/arch/powerpc/Kconfig
    +++ linux-2.6.17.2/arch/powerpc/Kconfig
    @@ -599,6 +599,9 @@ 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
    --- linux-2.6.17.2.orig/arch/x86_64/Kconfig
    +++ linux-2.6.17.2/arch/x86_64/Kconfig
    @@ -369,6 +369,8 @@ 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
    --- linux-2.6.17.2.orig/mm/Kconfig
    +++ linux-2.6.17.2/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

    comment "Memory hotplug is currently incompatible with Software Suspend"
    depends on SPARSEMEM && HOTPLUG && SOFTWARE_SUSPEND
    --
    -
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