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    Subject[patch 2/7] x86/lguest: Do not setup unused irq vectors
    No point in assigning the interrupt vectors if there is no interrupt
    chip installed. Move it to lguest_setup_irq().

    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Cc: Rusty Russell <rusty@rustcorp.com.au>
    ---
    arch/x86/lguest/boot.c | 13 ++++++++-----
    1 file changed, 8 insertions(+), 5 deletions(-)

    Index: tip/arch/x86/lguest/boot.c
    ===================================================================
    --- tip.orig/arch/x86/lguest/boot.c
    +++ tip/arch/x86/lguest/boot.c
    @@ -855,17 +855,13 @@ static void lguest_disable_irq(struct pc

    /*
    * This sets up the Interrupt Descriptor Table (IDT) entry for each hardware
    - * interrupt (except 128, which is used for system calls), and then tells the
    - * Linux infrastructure that each interrupt is controlled by our level-based
    - * lguest interrupt controller.
    + * interrupt (except 128, which is used for system calls).
    */
    static void __init lguest_init_IRQ(void)
    {
    unsigned int i;

    for (i = FIRST_EXTERNAL_VECTOR; i < FIRST_SYSTEM_VECTOR; i++) {
    - /* Some systems map "vectors" to interrupts weirdly. Not us! */
    - __this_cpu_write(vector_irq[i], i - FIRST_EXTERNAL_VECTOR);
    if (i != IA32_SYSCALL_VECTOR)
    set_intr_gate(i, irq_entries_start +
    8 * (i - FIRST_EXTERNAL_VECTOR));
    @@ -893,8 +889,15 @@ int lguest_setup_irq(unsigned int irq)
    if (err < 0 && err != -EEXIST)
    return err;

    + /*
    + * Tell the Linux infrastructure that the interrupt is
    + * controlled by our level-based lguest interrupt controller.
    + */
    irq_set_chip_and_handler_name(irq, &lguest_irq_controller,
    handle_level_irq, "level");
    +
    + /* Some systems map "vectors" to interrupts weirdly. Not us! */
    + __this_cpu_write(vector_irq[FIRST_EXTERNAL_VECTOR + irq, irq);
    return 0;
    }




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