Commit ff78f667 authored by Cai Huoqing's avatar Cai Huoqing Committed by Linus Torvalds
Browse files

trace/hwlat: make use of the helper function kthread_run_on_cpu() 

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

Link: https://lkml.kernel.org/r/20211022025711.3673-7-caihuoqing@baidu.com


Signed-off-by: default avatarCai Huoqing <caihuoqing@baidu.com>
Cc: Bernard Metzler <bmt@zurich.ibm.com>
Cc: Daniel Bristot de Oliveira <bristot@kernel.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Doug Ledford <dledford@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Joel Fernandes (Google) <joel@joelfernandes.org>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 11e4e352

kernel/trace/trace_hwlat.c

+1 −5
Original line number Diff line number Diff line
@@ -491,18 +491,14 @@ static void stop_per_cpu_kthreads(void) 
static int start_cpu_kthread(unsigned int cpu)

{

	struct task_struct *kthread;

	char comm[24];



	snprintf(comm, 24, "hwlatd/%d", cpu);



	kthread = kthread_create_on_cpu(kthread_fn, NULL, cpu, comm);

	kthread = kthread_run_on_cpu(kthread_fn, NULL, cpu, "hwlatd/%u");

	if (IS_ERR(kthread)) {

		pr_err(BANNER "could not start sampling thread\n");

		return -ENOMEM;

	}



	per_cpu(hwlat_per_cpu_data, cpu).kthread = kthread;

	wake_up_process(kthread);



	return 0;

}