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kthread: add the helper function kthread_run_on_cpu()

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[ Upstream commit 800977f6f3 ]

Add a new helper function kthread_run_on_cpu(), which includes
kthread_create_on_cpu/wake_up_process().

In some cases, use kthread_run_on_cpu() directly instead of
kthread_create_on_node/kthread_bind/wake_up_process() or
kthread_create_on_cpu/wake_up_process() or
kthreadd_create/kthread_bind/wake_up_process() to simplify the code.

[akpm@linux-foundation.org: export kthread_create_on_cpu to modules]

Link: https://lkml.kernel.org/r/20211022025711.3673-2-caihuoqing@baidu.com
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Cc: Bernard Metzler <bmt@zurich.ibm.com>
Cc: Cai Huoqing <caihuoqing@baidu.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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Stable-dep-of: 08697bca9b ("trace/hwlat: Do not start per-cpu thread if it is already running")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Cai Huoqing 2022-01-14 14:02:52 -08:00 • committed by Justin Hammond
parent 2905cc857f
commit bd7e0de0af
2 changed files with 26 additions and 0 deletions
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25
include/linux/kthread.h
View file

@ -56,6 +56,31 @@ bool kthread_is_per_cpu(struct task_struct *k);
__k; \
})
/**
* kthread_run_on_cpu - create and wake a cpu bound thread.
* @threadfn: the function to run until signal_pending(current).
* @data: data ptr for @threadfn.
* @cpu: The cpu on which the thread should be bound,
* @namefmt: printf-style name for the thread. Format is restricted
* to "name.*%u". Code fills in cpu number.
*
* Description: Convenient wrapper for kthread_create_on_cpu()
* followed by wake_up_process(). Returns the kthread or
* ERR_PTR(-ENOMEM).
*/
static inline struct task_struct *
kthread_run_on_cpu(int (*threadfn)(void *data), void *data,
unsigned int cpu, const char *namefmt)
{
struct task_struct *p;
p = kthread_create_on_cpu(threadfn, data, cpu, namefmt);
if (!IS_ERR(p))
wake_up_process(p);
return p;
}
void free_kthread_struct(struct task_struct *k);
void kthread_bind(struct task_struct *k, unsigned int cpu);
void kthread_bind_mask(struct task_struct *k, const struct cpumask *mask);

1
kernel/kthread.c
View file

@ -523,6 +523,7 @@ struct task_struct *kthread_create_on_cpu(int (*threadfn)(void *data),
to_kthread(p)->cpu = cpu;
return p;
}
EXPORT_SYMBOL(kthread_create_on_cpu);
void kthread_set_per_cpu(struct task_struct *k, int cpu)
{