linux-kernel - [tip:smp/hotplug] cpu/hotplug: Remove unused check_for

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Date:   Mon, 12 Jun 2017 10:04:16 -0700
From:   tip-bot for Arnd Bergmann <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, hpa@...or.com, linux-kernel@...r.kernel.org,
        boris.ostrovsky@...cle.com, arnd@...db.de, tglx@...utronix.de,
        peterz@...radead.org, anna-maria@...utronix.de,
        bigeasy@...utronix.de
Subject: [tip:smp/hotplug] cpu/hotplug: Remove unused check_for_tasks()
 function

Commit-ID:  57de72125d34f83bfd39615fcc3cc25ca3b9c0ec
Gitweb:     http://git.kernel.org/tip/57de72125d34f83bfd39615fcc3cc25ca3b9c0ec
Author:     Arnd Bergmann <arnd@...db.de>
AuthorDate: Thu, 8 Jun 2017 10:55:33 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Mon, 12 Jun 2017 19:00:55 +0200

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@...db.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: Anna-Maria Gleixner <anna-maria@...utronix.de>
Link: http://lkml.kernel.org/r/20170608085544.2257132-1-arnd@arndb.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 kernel/cpu.c | 24 ------------------------
 1 file changed, 24 deletions(-)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 7435ffc..d0f5f54 100644
--- 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)
 {