[PATCH] tracing/osnoise: Fix sparse warning in function start_kthread

[Wang ShaoBo <bobo.shaobowang@huawei.com>]

Change main to main_func to fix following sparse warning:

kernel/trace/trace_osnoise.c: In function ‘start_kthread’:
kernel/trace/trace_osnoise.c:1674:8: warning: ‘main’ is usually a function [-Wmain]
  void *main = osnoise_main;
        ^~~~

Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
---
 kernel/trace/trace_osnoise.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index 7520d43aed55..2bebf31d4baf 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -1691,17 +1691,17 @@ static void stop_per_cpu_kthreads(void)
 static int start_kthread(unsigned int cpu)
 {
 	struct task_struct *kthread;
-	void *main = osnoise_main;
+	void *main_func = osnoise_main;
 	char comm[24];
 
 	if (timerlat_enabled()) {
 		snprintf(comm, 24, "timerlat/%d", cpu);
-		main = timerlat_main;
+		main_func = timerlat_main;
 	} else {
 		snprintf(comm, 24, "osnoise/%d", cpu);
 	}
 
-	kthread = kthread_create_on_cpu(main, NULL, cpu, comm);
+	kthread = kthread_create_on_cpu(main_func, NULL, cpu, comm);
 
 	if (IS_ERR(kthread)) {
 		pr_err(BANNER "could not start sampling thread\n");
-- 
2.25.1