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    SubjectRe: [PATCH] [x86] Move cmpxchg fallbacks to a generic place

    * Thomas Petazzoni <thomas.petazzoni@free-electrons.com> wrote:

    > arch/x86/kernel/cpu/intel.c defines a few fallback functions
    > (cmpxchg_*()) that are used when the CPU doesn't support cmpxchg
    > and/or cmpxchg64 natively. However, while defined in an Intel-specific
    > file, these functions are also used for CPUs from other vendors when
    > they don't support cmpxchg and/or cmpxchg64. This breaks the
    > compilation when support for Intel CPUs is disabled.
    >
    > This patch moves these functions to a new
    > arch/x86/kernel/cpu/cmpxchg.c file, unconditionally compiled when
    > X86_32 is enabled.
    >
    > Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

    applied both fixes to tip/x86/cpu, thanks Thomas.

    I also flipped it around with the cpu-id reduction patch, so that it
    remains bisectable. The new commit IDs in -tip are:

    8bfcb39: x86: make movsl_mask definition non-CPU specific
    774400a: x86: move cmpxchg fallbacks to a generic place
    8d02c21: x86: configuration options to compile out x86 CPU support code

    Ingo


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