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    Subject[PATCH] x86: traps_xx: modify default_do_nmi
     - local caching of smp_processor_id()

    Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm>
    ---
    arch/x86/kernel/traps_32.c | 12 ++++++++----
    arch/x86/kernel/traps_64.c | 3 ++-
    2 files changed, 10 insertions(+), 5 deletions(-)

    diff --git a/arch/x86/kernel/traps_32.c b/arch/x86/kernel/traps_32.c
    index 68e800f..14fe3cd 100644
    --- a/arch/x86/kernel/traps_32.c
    +++ b/arch/x86/kernel/traps_32.c
    @@ -790,12 +790,16 @@ void notrace __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic)
    do_exit(SIGSEGV);
    }

    -static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
    +static notrace __kprobes void
    +default_do_nmi(struct pt_regs *regs)
    {
    unsigned char reason = 0;
    + int cpu;
    +
    + cpu = smp_processor_id();

    - /* Only the BSP gets external NMIs from the system: */
    - if (!smp_processor_id())
    + /* Only the BSP gets external NMIs from the system. */
    + if (!cpu)
    reason = get_nmi_reason();

    if (!(reason & 0xc0)) {
    @@ -809,7 +813,7 @@ static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
    */
    if (nmi_watchdog_tick(regs, reason))
    return;
    - if (!do_nmi_callback(regs, smp_processor_id()))
    + if (!do_nmi_callback(regs, cpu))
    unknown_nmi_error(reason, regs);
    #else
    unknown_nmi_error(reason, regs);
    diff --git a/arch/x86/kernel/traps_64.c b/arch/x86/kernel/traps_64.c
    index 677b4e5..2f8d87d 100644
    --- a/arch/x86/kernel/traps_64.c
    +++ b/arch/x86/kernel/traps_64.c
    @@ -832,7 +832,8 @@ unknown_nmi_error(unsigned char reason, struct pt_regs * regs)

    /* Runs on IST stack. This code must keep interrupts off all the time.
    Nested NMIs are prevented by the CPU. */
    -asmlinkage notrace __kprobes void default_do_nmi(struct pt_regs *regs)
    +asmlinkage notrace __kprobes void
    +default_do_nmi(struct pt_regs *regs)
    {
    unsigned char reason = 0;
    int cpu;
    --
    1.5.4.3


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