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    Subject[patch 27/59] x86: Work around gcc 4.2 over aggressive optimizer
    -stable review patch.  If anyone has any objections, please let us know.
    ------------------

    From: Andi Kleen <ak@suse.de>

    The new PDA code uses a dummy _proxy_pda variable to describe
    memory references to the PDA. It is never referenced
    in inline assembly, but exists as input/output arguments.
    gcc 4.2 in some cases can CSE references to this which causes
    unresolved symbols. Define it to zero to avoid this.

    Signed-off-by: Andi Kleen <ak@suse.de>
    Signed-off-by: Chris Wright <chrisw@sous-sol.org>
    ---
    arch/i386/kernel/vmlinux.lds.S | 1 +
    arch/x86_64/kernel/vmlinux.lds.S | 1 +
    2 files changed, 2 insertions(+)

    --- linux-2.6.19.2.orig/arch/i386/kernel/vmlinux.lds.S
    +++ linux-2.6.19.2/arch/i386/kernel/vmlinux.lds.S
    @@ -13,6 +13,7 @@ OUTPUT_FORMAT("elf32-i386", "elf32-i386"
    OUTPUT_ARCH(i386)
    ENTRY(phys_startup_32)
    jiffies = jiffies_64;
    +_proxy_pda = 0;

    PHDRS {
    text PT_LOAD FLAGS(5); /* R_E */
    --- linux-2.6.19.2.orig/arch/x86_64/kernel/vmlinux.lds.S
    +++ linux-2.6.19.2/arch/x86_64/kernel/vmlinux.lds.S
    @@ -13,6 +13,7 @@ OUTPUT_FORMAT("elf64-x86-64", "elf64-x86
    OUTPUT_ARCH(i386:x86-64)
    ENTRY(phys_startup_64)
    jiffies_64 = jiffies;
    +_proxy_pda = 0;
    PHDRS {
    text PT_LOAD FLAGS(5); /* R_E */
    data PT_LOAD FLAGS(7); /* RWE */
    --
    -
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