linux-kernel - [PATCH] workqueue: Convert timers to use timer

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Message-ID: <20171016225825.GA99101@beast>
Date:   Mon, 16 Oct 2017 15:58:25 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Tejun Heo <tj@...nel.org>, Lai Jiangshan <jiangshanlai@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] workqueue: Convert timers to use timer_setup() (part 2)

In preparation for unconditionally passing the struct timer_list pointer
to all timer callbacks, switch to using the new timer_setup() and
from_timer() to pass the timer pointer explicitly. (The prior workqueue
patch missed a few timers.)

Cc: Tejun Heo <tj@...nel.org>
Cc: Lai Jiangshan <jiangshanlai@...il.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 kernel/workqueue.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 0fca63fab060..3b67c0a0df16 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1832,9 +1832,9 @@ static void destroy_worker(struct worker *worker)
 	wake_up_process(worker->task);
 }
 
-static void idle_worker_timeout(unsigned long __pool)
+static void idle_worker_timeout(struct timer_list *t)
 {
-	struct worker_pool *pool = (void *)__pool;
+	struct worker_pool *pool = from_timer(pool, t, idle_timer);
 
 	spin_lock_irq(&pool->lock);
 
@@ -1880,9 +1880,9 @@ static void send_mayday(struct work_struct *work)
 	}
 }
 
-static void pool_mayday_timeout(unsigned long __pool)
+static void pool_mayday_timeout(struct timer_list *t)
 {
-	struct worker_pool *pool = (void *)__pool;
+	struct worker_pool *pool = from_timer(pool, t, mayday_timer);
 	struct work_struct *work;
 
 	spin_lock_irq(&pool->lock);
@@ -3235,11 +3235,9 @@ static int init_worker_pool(struct worker_pool *pool)
 	INIT_LIST_HEAD(&pool->idle_list);
 	hash_init(pool->busy_hash);
 
-	setup_deferrable_timer(&pool->idle_timer, idle_worker_timeout,
-			       (unsigned long)pool);
+	timer_setup(&pool->idle_timer, idle_worker_timeout, TIMER_DEFERRABLE);
 
-	setup_timer(&pool->mayday_timer, pool_mayday_timeout,
-		    (unsigned long)pool);
+	timer_setup(&pool->mayday_timer, pool_mayday_timeout, 0);
 
 	mutex_init(&pool->attach_mutex);
 	INIT_LIST_HEAD(&pool->workers);
-- 
2.7.4


-- 
Kees Cook
Pixel Security