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    Subject[PATCH 17/23] [PATCH] x86_64: Let impossible CPUs point to reference per cpu data
    -stable review patch.  If anyone has any objections, please let us know.
    ------------------

    Don't mark the reference per cpu data init data (so it stays
    around after boot) and point all impossible CPUs to it. This way
    they reference some valid - although shared memory. Usually
    this is only initialization like INIT_LIST_HEADs and there
    won't be races because these CPUs never run. Still somewhat hackish.

    Signed-off-by: Andi Kleen <ak@suse.de>
    Signed-off-by: Chris Wright <chrisw@sous-sol.org>
    ---

    arch/x86_64/kernel/vmlinux.lds.S | 10 ++++++----
    1 files changed, 6 insertions(+), 4 deletions(-)

    Index: linux-2.6.15.3/arch/x86_64/kernel/vmlinux.lds.S
    ===================================================================
    --- linux-2.6.15.3.orig/arch/x86_64/kernel/vmlinux.lds.S
    +++ linux-2.6.15.3/arch/x86_64/kernel/vmlinux.lds.S
    @@ -170,13 +170,15 @@ SECTIONS
    . = ALIGN(4096);
    __initramfs_start = .;
    .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) { *(.init.ramfs) }
    - __initramfs_end = .;
    - . = ALIGN(32);
    + __initramfs_end = .;
    + /* temporary here to work around NR_CPUS. If you see this comment in 2.6.17+
    + complain */
    + . = ALIGN(4096);
    + __init_end = .;
    + . = ALIGN(128);
    __per_cpu_start = .;
    .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { *(.data.percpu) }
    __per_cpu_end = .;
    - . = ALIGN(4096);
    - __init_end = .;

    . = ALIGN(4096);
    __nosave_begin = .;
    --
    -
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