The patch titled
Subject: kthread: add the helper function kthread_run_on_cpu()
has been added to the -mm tree. Its filename is
kthread-add-the-helper-function-kthread_run_on_cpu.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/kthread-add-the-helper-function-kthread_run_on_cpu.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/kthread-add-the-helper-function-kthread_run_on_cpu.patch
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------------------------------------------------------
From: Cai Huoqing <caihuoqing@xxxxxxxxx>
Subject: kthread: add the helper function kthread_run_on_cpu()
the helper function kthread_run_on_cpu() 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.
Link: https://lkml.kernel.org/r/20211022025711.3673-2-caihuoqing@xxxxxxxxx
Signed-off-by: Cai Huoqing <caihuoqing@xxxxxxxxx>
Cc: Bernard Metzler <bmt@xxxxxxxxxxxxxx>
Cc: Cai Huoqing <caihuoqing@xxxxxxxxx>
Cc: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: Doug Ledford <dledford@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
Cc: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
Cc: Lai Jiangshan <jiangshanlai@xxxxxxxxx>
Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: "Paul E . McKenney" <paulmck@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/kthread.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
--- a/include/linux/kthread.h~kthread-add-the-helper-function-kthread_run_on_cpu
+++ a/include/linux/kthread.h
@@ -56,6 +56,31 @@ bool kthread_is_per_cpu(struct task_stru
__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);
_
Patches currently in -mm which might be from caihuoqing@xxxxxxxxx are
kthread-add-the-helper-function-kthread_run_on_cpu.patch
rdma-siw-make-use-of-the-helper-function-kthread_run_on_cpu.patch
ring-buffer-make-use-of-the-helper-function-kthread_run_on_cpu.patch
rcutorture-make-use-of-the-helper-function-kthread_run_on_cpu.patch
trace-osnoise-make-use-of-the-helper-function-kthread_run_on_cpu.patch
trace-hwlat-make-use-of-the-helper-function-kthread_run_on_cpu.patch
