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* [PATCH] trace: Remove get/put_cpu() from function_trace_init
@ 2020-12-25 14:23 Qiujun Huang
  2020-12-30  7:46 ` [trace] 2158a32526: BUG:using_smp_processor_id()in_preemptible kernel test robot
  2020-12-30 13:30 ` [PATCH] trace: Remove get/put_cpu() from function_trace_init Qiujun Huang
  0 siblings, 2 replies; 3+ messages in thread
From: Qiujun Huang @ 2020-12-25 14:23 UTC (permalink / raw)
  To: rostedt, mingo, linux-kernel; +Cc: Qiujun Huang

Since commit b6f11df26fdc ("trace: Call tracing_reset_online_cpus before
tracer->init()"), get/put_cpu() are not needed anymore.
We can use smp_processor_id() instead.

Signed-off-by: Qiujun Huang <hqjagain@gmail.com>
---
 kernel/trace/trace_functions.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index c5095dd28e20..e36fbb935017 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -106,8 +106,7 @@ static int function_trace_init(struct trace_array *tr)
 
 	ftrace_init_array_ops(tr, func);
 
-	tr->array_buffer.cpu = get_cpu();
-	put_cpu();
+	tr->array_buffer.cpu = smp_processor_id();
 
 	tracing_start_cmdline_record();
 	tracing_start_function_trace(tr);
-- 
2.17.1


^ permalink raw reply	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2020-12-30 13:31 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2020-12-25 14:23 [PATCH] trace: Remove get/put_cpu() from function_trace_init Qiujun Huang
2020-12-30  7:46 ` [trace] 2158a32526: BUG:using_smp_processor_id()in_preemptible kernel test robot
2020-12-30 13:30 ` [PATCH] trace: Remove get/put_cpu() from function_trace_init Qiujun Huang

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