Prarit Bhargava wrote:

I'd like to see this patch implement/fix touch_cpu_softlockup_watchdog
and touch_softlockup_watchdog to mimic touch_nmi_watchdog's behaviour.

Why?  Is that more correct?  It seems to me that you're interested in
whether a specific CPU has gone and locked up.  If touching the watchdog
makes it update all CPU timestamps, then you'll hide the fact that other
CPUs have locked up, won't it?

    J