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Subject[PATCH 12/13] kthread: Convert callback to use from_timer()
Date
In preparation for unconditionally passing the struct timer_list pointer
to all timer callbacks, switch kthread to use from_timer() and pass the
timer pointer explicitly.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
include/linux/kthread.h | 10 +++++-----
kernel/kthread.c | 10 ++++------
2 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index 0d622b350d3f..35cbe3b0ce5b 100644
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h
@@ -75,7 +75,7 @@ extern int tsk_fork_get_node(struct task_struct *tsk);
*/
struct kthread_work;
typedef void (*kthread_work_func_t)(struct kthread_work *work);
-void kthread_delayed_work_timer_fn(unsigned long __data);
+void kthread_delayed_work_timer_fn(struct timer_list *t);

enum {
KTW_FREEZABLE = 1 << 0, /* freeze during suspend */
@@ -116,8 +116,8 @@ struct kthread_delayed_work {

#define KTHREAD_DELAYED_WORK_INIT(dwork, fn) { \
.work = KTHREAD_WORK_INIT((dwork).work, (fn)), \
- .timer = __TIMER_INITIALIZER(kthread_delayed_work_timer_fn, \
- (unsigned long)&(dwork), \
+ .timer = __TIMER_INITIALIZER((TIMER_FUNC_TYPE)kthread_delayed_work_timer_fn,\
+ (TIMER_DATA_TYPE)&(dwork.timer), \
TIMER_IRQSAFE), \
}

@@ -164,8 +164,8 @@ extern void __kthread_init_worker(struct kthread_worker *worker,
do { \
kthread_init_work(&(dwork)->work, (fn)); \
__setup_timer(&(dwork)->timer, \
- kthread_delayed_work_timer_fn, \
- (unsigned long)(dwork), \
+ (TIMER_FUNC_TYPE)kthread_delayed_work_timer_fn,\
+ (TIMER_DATA_TYPE)&(dwork)->timer, \
TIMER_IRQSAFE); \
} while (0)

diff --git a/kernel/kthread.c b/kernel/kthread.c
index 1c19edf82427..ba3992c8c375 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -798,15 +798,14 @@ EXPORT_SYMBOL_GPL(kthread_queue_work);
/**
* kthread_delayed_work_timer_fn - callback that queues the associated kthread
* delayed work when the timer expires.
- * @__data: pointer to the data associated with the timer
+ * @t: pointer to the expired timer
*
* The format of the function is defined by struct timer_list.
* It should have been called from irqsafe timer with irq already off.
*/
-void kthread_delayed_work_timer_fn(unsigned long __data)
+void kthread_delayed_work_timer_fn(struct timer_list *t)
{
- struct kthread_delayed_work *dwork =
- (struct kthread_delayed_work *)__data;
+ struct kthread_delayed_work *dwork = from_timer(dwork, t, timer);
struct kthread_work *work = &dwork->work;
struct kthread_worker *worker = work->worker;

@@ -837,8 +836,7 @@ void __kthread_queue_delayed_work(struct kthread_worker *worker,
struct timer_list *timer = &dwork->timer;
struct kthread_work *work = &dwork->work;

- WARN_ON_ONCE(timer->function != kthread_delayed_work_timer_fn ||
- timer->data != (unsigned long)dwork);
+ WARN_ON_ONCE(timer->function != (TIMER_FUNC_TYPE)kthread_delayed_work_timer_fn);

/*
* If @delay is 0, queue @dwork->work immediately. This is for
--
2.7.4
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