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: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <4BA97FA1.7030606@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_clock.c b/kernel/trace/trace_clock.c
index 6fbfb8f417b9cd9d60d72ff6b6a0c9c54c520ce1..9d589d8dcd1aa7e9470b6868980a20c4aeaf6160 100644 (file)
--- a/kernel/trace/trace_clock.c
+++ b/kernel/trace/trace_clock.c
@@ -84,7 +84,7 @@ u64 notrace trace_clock_global(void)
        int this_cpu;
        u64 now;
 
-       raw_local_irq_save(flags);
+       local_irq_save(flags);
 
        this_cpu = raw_smp_processor_id();
        now = cpu_clock(this_cpu);
@@ -110,7 +110,7 @@ u64 notrace trace_clock_global(void)
        arch_spin_unlock(&trace_clock_struct.lock);
 
  out:
-       raw_local_irq_restore(flags);
+       local_irq_restore(flags);
 
        return now;
 }