函数源码

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source File:arch\x86\kernel\apic\apic.c Create Date:2022-07-27 09:26:59
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/*
 * Local APIC interrupts
 */
 
/*
 * This interrupt should _never_ happen with our APIC/SMP architecture
 */
__visible void __irq_entry smp_spurious_interrupt(struct pt_regs *regs)
{
    u8 vector = ~regs->orig_ax;
    u32 v;
 
    entering_irq();
    trace_spurious_apic_entry(vector);
 
    inc_irq_stat(irq_spurious_count);
 
    /*
     * If this is a spurious interrupt then do not acknowledge
     */
    if (vector == SPURIOUS_APIC_VECTOR) {
        /* See SDM vol 3 */
        pr_info("Spurious APIC interrupt (vector 0xFF) on CPU#%d, should never happen.\n",
            smp_processor_id());
        goto out;
    }
 
    /*
     * If it is a vectored one, verify it's set in the ISR. If set,
     * acknowledge it.
     */
    v = apic_read(APIC_ISR + ((vector & ~0x1f) >> 1));
    if (v & (1 << (vector & 0x1f))) {
        pr_info("Spurious interrupt (vector 0x%02x) on CPU#%d. Acked\n",
            vector, smp_processor_id());
        ack_APIC_irq();
    } else {
        pr_info("Spurious interrupt (vector 0x%02x) on CPU#%d. Not pending!\n",
            vector, smp_processor_id());
    }
out:
    trace_spurious_apic_exit(vector);
    exiting_irq();
}