tracing: Fix lockdep warning in global_clock()
# echo 1 > events/enable # echo global > trace_clock ------------[ cut here ]------------ WARNING: at kernel/lockdep.c:3162 check_flags+0xb2/0x190() ... ---[ end trace 3f86734a89416623 ]--- possible reason: unannotated irqs-on. ... There's no reason to use the raw_local_irq_save() in trace_clock_global. The local_irq_save() version is fine, and does not cause the bug in lockdep. Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4BA97FA1.7030606@cn.fujitsu.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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