From: Andrea Righi <arighi@nvidia.com> mainline inclusion from mainline-v6.13-rc1 commit b452ae4d20aefe96232440421faed37c9d3410a7 category: feature bugzilla: https://atomgit.com/openeuler/kernel/issues/8335 Reference: https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commi... -------------------------------- Update ops.select_cpu() documentation to clarify that this method is not called for tasks that are restricted to run on a single CPU, as these tasks do not have the option to select a different CPU. Signed-off-by: Andrea Righi <arighi@nvidia.com> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Zicheng Qu <quzicheng@huawei.com> Signed-off-by: cheliequan <cheliequan@inspur.com> Signed-off-by: Luo Gengkun <luogengkun2@huawei.com> --- kernel/sched/ext.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index 089b3497342c..527555f123f6 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -226,6 +226,11 @@ struct sched_ext_ops { * is dispatched, the ops.enqueue() callback will be skipped. Finally, * if @p is dispatched to SCX_DSQ_LOCAL, it will be dispatched to the * local DSQ of whatever CPU is returned by this callback. + * + * Note that select_cpu() is never called for tasks that can only run + * on a single CPU or tasks with migration disabled, as they don't have + * the option to select a different CPU. See select_task_rq() for + * details. */ s32 (*select_cpu)(struct task_struct *p, s32 prev_cpu, u64 wake_flags); -- 2.34.1