linux-imx

'hardlockup_panic', a compile time knob, "BOOTPARAM_HARDLOCKUP_PANIC",

and a kernel parameter, "nmi_watchdog"

(see "Documentation/admin-guide/kernel-parameters.rst" for details).

​

The panic option can be used in combination with panic_timeout (this

timeout is set through the confusingly named "kernel.panic" sysctl),

to cause the system to reboot automatically after a specified amount

of time.

​

​

The soft and hard lockup detectors are built on top of the hrtimer and

perf subsystems, respectively. A direct consequence of this is that,

in principle, they should work in any architecture where these

subsystems are present.

​

A periodic hrtimer runs to generate interrupts and kick the watchdog

task. An NMI perf event is generated every "watchdog_thresh"

(compile-time initialized to 10 and configurable through sysctl of the

same name) seconds to check for hardlockups. If any CPU in the system