[003/146] ring-buffer: make use of the helper function kthread_run_on_cpu()

Commit Message

Andrew Morton Jan. 14, 2022, 10:02 p.m. UTC

From: Cai Huoqing <[e-mail]>
Subject: ring-buffer: make use of the helper function kthread_run_on_cpu()

Replace kthread_create/kthread_bind/wake_up_process() with
kthread_run_on_cpu() to simplify the code.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Cai Huoqing <[e-mail]>
Cc: Bernard Metzler <[e-mail]>
Cc: Daniel Bristot de Oliveira <[e-mail]>
Cc: Davidlohr Bueso <[e-mail]>
Cc: Doug Ledford <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jason Gunthorpe <[e-mail]>
Cc: Joel Fernandes (Google) <[e-mail]>
Cc: Josh Triplett <[e-mail]>
Cc: Lai Jiangshan <[e-mail]>
Cc: Mathieu Desnoyers <[e-mail]>
Cc: "Paul E . McKenney" <[e-mail]>
Cc: Steven Rostedt <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 kernel/trace/ring_buffer.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

Patch

--- a/kernel/trace/ring_buffer.c~ring-buffer-make-use-of-the-helper-function-kthread_run_on_cpu
+++ a/kernel/trace/ring_buffer.c
@@ -5898,16 +5898,13 @@  static __init int test_ringbuffer(void)
 		rb_data[cpu].buffer = buffer;
 		rb_data[cpu].cpu = cpu;
 		rb_data[cpu].cnt = cpu;
-		rb_threads[cpu] = kthread_create(rb_test, &rb_data[cpu],
-						 "rbtester/%d", cpu);
+		rb_threads[cpu] = kthread_run_on_cpu(rb_test, &rb_data[cpu],
+						     cpu, "rbtester/%u");
 		if (WARN_ON(IS_ERR(rb_threads[cpu]))) {
 			pr_cont("FAILED\n");
 			ret = PTR_ERR(rb_threads[cpu]);
 			goto out_free;
 		}
-
-		kthread_bind(rb_threads[cpu], cpu);
- 		wake_up_process(rb_threads[cpu]);
 	}
 
 	/* Now create the rb hammer! */