cpu/hotplug: Remove unused check_for_tasks() function

clang -Wunused-function found one remaining function that was
apparently meant to be removed in a recent code cleanup:

kernel/cpu.c:565:20: warning: unused function 'check_for_tasks' [-Wunused-function]

Sebastian explained: The function became unused unintentionally, but there
is already a failure check, when a task cannot be removed from the outgoing
cpu in the scheduler code, so bringing it back is not really giving any
extra value.

Fixes: 530e9b76ae8f ("cpu/hotplug: Remove obsolete cpu hotplug register/unregister functions")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Anna-Maria Gleixner <anna-maria@linutronix.de>
Link: http://lkml.kernel.org/r/20170608085544.2257132-1-arnd@arndb.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 7435ffc6163b83f8dc9bd56f9f1446445b535dde..d0f5f54aa0870f304d0cd07282a7914001cc9904 100644 (file)
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -562,30 +562,6 @@ void clear_tasks_mm_cpumask(int cpu)
        rcu_read_unlock();
 }
 
-static inline void check_for_tasks(int dead_cpu)
-{
-       struct task_struct *g, *p;
-
-       read_lock(&tasklist_lock);
-       for_each_process_thread(g, p) {
-               if (!p->on_rq)
-                       continue;
-               /*
-                * We do the check with unlocked task_rq(p)->lock.
-                * Order the reading to do not warn about a task,
-                * which was running on this cpu in the past, and
-                * it's just been woken on another cpu.
-                */
-               rmb();
-               if (task_cpu(p) != dead_cpu)
-                       continue;
-
-               pr_warn("Task %s (pid=%d) is on cpu %d (state=%ld, flags=%x)\n",
-                       p->comm, task_pid_nr(p), dead_cpu, p->state, p->flags);
-       }
-       read_unlock(&tasklist_lock);
-}
-
 /* Take this CPU down. */
 static int take_cpu_down(void *_param)
 {