linux-kernel - [PATCH] trace: Remove get/put_cpu() from function_trace

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Message-Id: <20201225142347.27204-1-hqjagain@gmail.com>
Date:   Fri, 25 Dec 2020 22:23:47 +0800
From:   Qiujun Huang <hqjagain@...il.com>
To:     rostedt@...dmis.org, mingo@...hat.com, linux-kernel@...r.kernel.org
Cc:     Qiujun Huang <hqjagain@...il.com>
Subject: [PATCH] trace: Remove get/put_cpu() from function_trace_init

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@...il.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