perf: Stop all counters on reboot

Use the reboot notifier to detach all running counters on reboot, this
solves a problem with kexec where the new kernel doesn't expect
running counters (rightly so).

It will however decrease the coverage of the NMI watchdog. Making a
kexec specific reboot notifier callback would be best, however that
would require touching all notifier callback handlers as they are not
properly structured to deal with new state.

As a compromise, place the perf reboot notifier at the very last
position in the list.

Reported-by: Yinghai Lu <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Cc: Vivek Goyal <[email protected]>
Cc: Eric W. Biederman <[email protected]>
Cc: Jason Wessel <[email protected]>
Cc: Don Zickus <[email protected]>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <[email protected]>

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