perf/x86: Push the duration-logging printk() to IRQ context

Calling printk() from NMI context is bad (TM), so move it to IRQ
context.

This also avoids the problem where the printk() time is measured by
the generic NMI duration goo and triggers a second warning.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Link: http://lkml.kernel.org/n/tip-75dv35xf6dhhmeb7nq6fua31@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --cc include/linux/irq_work.h
Simple merge

diff --cc kernel/events/core.c
Simple merge