sched/core: Add kernel-doc for set_cpus_allowed_ptr()

This is an exported symbol, so it should have kernel-doc.
Add a note to very similar function do_set_cpus_allowed()
to avoid confusion and misuse.

Signed-off-by: Costa Shulyupin <costa.shul@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230829082551.2661290-1-costa.shul@redhat.com

Author: makelinux

include/linux/sched.h

@@ -1858,7 +1858,17 @@ extern int task_can_attach(struct task_struct *p);
 extern int dl_bw_alloc(int cpu, u64 dl_bw);
 extern void dl_bw_free(int cpu, u64 dl_bw);
 #ifdef CONFIG_SMP
+
+/* do_set_cpus_allowed() - consider using set_cpus_allowed_ptr() instead */
 extern void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask);
+
+/**
+ * set_cpus_allowed_ptr - set CPU affinity mask of a task
+ * @p: the task
+ * @new_mask: CPU affinity mask
+ *
+ * Return: zero if successful, or a negative error code
+ */
 extern int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask);
 extern int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int node);
 extern void release_user_cpus_ptr(struct task_struct *p);