At the end of do_nmi are these instructions
outb(0x8f, 0x70);
inb(0x71); /* dummy */
outb(0x0f, 0x70);
inb(0x71); /* dummy */
If the NMI is for the watchdog, these instructions are bypassed.
(1) Why do we need these instructions?
(2) Why does nmi_watchdog_tick bypass them?
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