ftrace: introduce tracing_reset_online_cpus() helper

Impact: cleanup

This patch factors out common code from multiple tracers into a
tracing_reset_online_cpus() function and converts the tracers to use it.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --cc kernel/trace/trace.c
Simple merge

diff --cc kernel/trace/trace.h
Simple merge

diff --cc kernel/trace/trace_boot.c
Simple merge

diff --cc kernel/trace/trace_functions.c
Simple merge

diff --cc kernel/trace/trace_hw_branches.c
Simple merge

diff --cc kernel/trace/trace_mmiotrace.c
Simple merge

diff --cc kernel/trace/trace_sched_switch.c
Simple merge

diff --cc kernel/trace/trace_sysprof.c
Simple merge