watchdog: trigger all-cpu backtrace when locked up and going to panic

watchdog: trigger all-cpu backtrace when locked up and going to panic

Send an NMI to all CPUs when a lockup is detected and the lockup watchdog
code is configured to panic.  This gives us a fairly uptodate snapshot of
all CPUs in the system.

This lets us get stack trace of all CPUs which makes life easier trying to
debug a deadlock, and the NMI doesn't change anything since the next step
is a kernel panic.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>