From: Peter Zijlstra <peterz@xxxxxxxxxxxxx> [ Upstream commit 50809358dd7199aa7ce232f6877dd09ec30ef374 ] Since there's already two copies of this code, introduce a helper now before adding a third one. Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Cc: juri.lelli@xxxxxxx Cc: bigeasy@xxxxxxxxxxxxx Cc: xlpang@xxxxxxxxxx Cc: rostedt@xxxxxxxxxxx Cc: mathieu.desnoyers@xxxxxxxxxxxx Cc: jdesfossez@xxxxxxxxxxxx Cc: dvhart@xxxxxxxxxxxxx Cc: bristot@xxxxxxxxxx Link: http://lkml.kernel.org/r/20170322104151.950039479@xxxxxxxxxxxxx Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Signed-off-by: Zhen Lei <thunder.leizhen@xxxxxxxxxx> --- kernel/futex.c | 5 +---- kernel/locking/rtmutex.c | 12 +++++++++--- kernel/locking/rtmutex_common.h | 1 + 3 files changed, 11 insertions(+), 7 deletions(-) diff --git a/kernel/futex.c b/kernel/futex.c index dab9c79a931a23e..53a085a378f3844 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -3156,10 +3156,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags, * The waiter is allocated on our stack, manipulated by the requeue * code while we sleep on uaddr. */ - debug_rt_mutex_init_waiter(&rt_waiter); - RB_CLEAR_NODE(&rt_waiter.pi_tree_entry); - RB_CLEAR_NODE(&rt_waiter.tree_entry); - rt_waiter.task = NULL; + rt_mutex_init_waiter(&rt_waiter); ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, VERIFY_WRITE); if (unlikely(ret != 0)) diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c index 1c0cb5c3c6ad6fe..fa24df4bc7a8ff0 100644 --- a/kernel/locking/rtmutex.c +++ b/kernel/locking/rtmutex.c @@ -1155,6 +1155,14 @@ void rt_mutex_adjust_pi(struct task_struct *task) next_lock, NULL, task); } +void rt_mutex_init_waiter(struct rt_mutex_waiter *waiter) +{ + debug_rt_mutex_init_waiter(waiter); + RB_CLEAR_NODE(&waiter->pi_tree_entry); + RB_CLEAR_NODE(&waiter->tree_entry); + waiter->task = NULL; +} + /** * __rt_mutex_slowlock() - Perform the wait-wake-try-to-take loop * @lock: the rt_mutex to take @@ -1236,9 +1244,7 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state, struct rt_mutex_waiter waiter; int ret = 0; - debug_rt_mutex_init_waiter(&waiter); - RB_CLEAR_NODE(&waiter.pi_tree_entry); - RB_CLEAR_NODE(&waiter.tree_entry); + rt_mutex_init_waiter(&waiter); raw_spin_lock(&lock->wait_lock); diff --git a/kernel/locking/rtmutex_common.h b/kernel/locking/rtmutex_common.h index 4584db96265d429..0424ff97bb69cad 100644 --- a/kernel/locking/rtmutex_common.h +++ b/kernel/locking/rtmutex_common.h @@ -102,6 +102,7 @@ extern struct task_struct *rt_mutex_next_owner(struct rt_mutex *lock); extern void rt_mutex_init_proxy_locked(struct rt_mutex *lock, struct task_struct *proxy_owner); extern void rt_mutex_proxy_unlock(struct rt_mutex *lock); +extern void rt_mutex_init_waiter(struct rt_mutex_waiter *waiter); extern int rt_mutex_start_proxy_lock(struct rt_mutex *lock, struct rt_mutex_waiter *waiter, struct task_struct *task); -- 2.26.0.106.g9fadedd
