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Date: Tue, 13 Jul 2021 17:11:10 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>,
Juri Lelli <juri.lelli@...hat.com>,
Steven Rostedt <rostedt@...dmis.org>,
Daniel Bristot de Oliveira <bristot@...hat.com>,
Will Deacon <will@...nel.org>,
Waiman Long <longman@...hat.com>,
Boqun Feng <boqun.feng@...il.com>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Davidlohr Bueso <dave@...olabs.net>
Subject: [patch 16/50] locking/rtmutex: Use rt_mutex_wake_q_head
From: Thomas Gleixner <tglx@...utronix.de>
Prepare for the required state aware handling of waiter wakeups via wake_q
and switch the rtmutex code over to the rtmutex specific wrapper.
No functional change.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
kernel/futex.c | 6 +++---
kernel/locking/rtmutex.c | 12 ++++++------
kernel/locking/rtmutex_api.c | 19 ++++++++-----------
kernel/locking/rtmutex_common.h | 4 ++--
4 files changed, 19 insertions(+), 22 deletions(-)
---
diff --git a/kernel/futex.c b/kernel/futex.c
index 408cad5e8968..e60bcddec287 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1493,11 +1493,11 @@ static void mark_wake_futex(struct wake_q_head *wake_q, struct futex_q *q)
*/
static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_pi_state *pi_state)
{
+ DEFINE_RT_MUTEX_WAKE_Q_HEAD(wqh);
u32 curval, newval;
struct rt_mutex_waiter *top_waiter;
struct task_struct *new_owner;
bool postunlock = false;
- DEFINE_WAKE_Q(wake_q);
int ret = 0;
top_waiter = rt_mutex_top_waiter(&pi_state->pi_mutex);
@@ -1549,14 +1549,14 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_pi_state *pi_
* not fail.
*/
pi_state_update_owner(pi_state, new_owner);
- postunlock = __rt_mutex_futex_unlock(&pi_state->pi_mutex, &wake_q);
+ postunlock = __rt_mutex_futex_unlock(&pi_state->pi_mutex, &wqh);
}
out_unlock:
raw_spin_unlock_irq(&pi_state->pi_mutex.wait_lock);
if (postunlock)
- rt_mutex_postunlock(&wake_q);
+ rt_mutex_postunlock(&wqh);
return ret;
}
diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
index db3103e2733b..11b2e7d29641 100644
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -1017,7 +1017,7 @@ static int __sched task_blocks_on_rt_mutex(struct rt_mutex *lock,
*
* Called with lock->wait_lock held and interrupts disabled.
*/
-static void __sched mark_wakeup_next_waiter(struct wake_q_head *wake_q,
+static void __sched mark_wakeup_next_waiter(struct rt_mutex_wake_q_head *wqh,
struct rt_mutex *lock)
{
struct rt_mutex_waiter *waiter;
@@ -1054,10 +1054,10 @@ static void __sched mark_wakeup_next_waiter(struct wake_q_head *wake_q,
* deboost but before waking our donor task, hence the preempt_disable()
* before unlock.
*
- * Pairs with preempt_enable() in rt_mutex_postunlock();
+ * Pairs with preempt_enable() in rt_mutex_wake_up_q();
*/
preempt_disable();
- wake_q_add(wake_q, waiter->task);
+ rt_mutex_wake_q_add(wqh, waiter);
raw_spin_unlock(¤t->pi_lock);
}
@@ -1323,7 +1323,7 @@ static __always_inline int __rt_mutex_trylock(struct rt_mutex *lock)
*/
static void __sched rt_mutex_slowunlock(struct rt_mutex *lock)
{
- DEFINE_WAKE_Q(wake_q);
+ DEFINE_RT_MUTEX_WAKE_Q_HEAD(wqh);
unsigned long flags;
/* irqsave required to support early boot calls */
@@ -1376,10 +1376,10 @@ static void __sched rt_mutex_slowunlock(struct rt_mutex *lock)
*
* Queue the next waiter for wakeup once we release the wait_lock.
*/
- mark_wakeup_next_waiter(&wake_q, lock);
+ mark_wakeup_next_waiter(&wqh, lock);
raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
- rt_mutex_postunlock(&wake_q);
+ rt_mutex_wake_up_q(&wqh);
}
static __always_inline void __rt_mutex_unlock(struct rt_mutex *lock)
diff --git a/kernel/locking/rtmutex_api.c b/kernel/locking/rtmutex_api.c
index 976ad96477eb..174af1375068 100644
--- a/kernel/locking/rtmutex_api.c
+++ b/kernel/locking/rtmutex_api.c
@@ -131,10 +131,10 @@ int __sched __rt_mutex_futex_trylock(struct rt_mutex *lock)
* do not use the fast-path, can be simple and will not need to retry.
*
* @lock: The rt_mutex to be unlocked
- * @wake_q: The wake queue head from which to get the next lock waiter
+ * @wqh: The wake queue head from which to get the next lock waiter
*/
bool __sched __rt_mutex_futex_unlock(struct rt_mutex *lock,
- struct wake_q_head *wake_q)
+ struct rt_mutex_wake_q_head *wqh)
{
lockdep_assert_held(&lock->wait_lock);
@@ -151,23 +151,23 @@ bool __sched __rt_mutex_futex_unlock(struct rt_mutex *lock,
* avoid inversion prior to the wakeup. preempt_disable()
* therein pairs with rt_mutex_postunlock().
*/
- mark_wakeup_next_waiter(wake_q, lock);
+ mark_wakeup_next_waiter(wqh, lock);
return true; /* call postunlock() */
}
void __sched rt_mutex_futex_unlock(struct rt_mutex *lock)
{
- DEFINE_WAKE_Q(wake_q);
+ DEFINE_RT_MUTEX_WAKE_Q_HEAD(wqh);
unsigned long flags;
bool postunlock;
raw_spin_lock_irqsave(&lock->wait_lock, flags);
- postunlock = __rt_mutex_futex_unlock(lock, &wake_q);
+ postunlock = __rt_mutex_futex_unlock(lock, &wqh);
raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
if (postunlock)
- rt_mutex_postunlock(&wake_q);
+ rt_mutex_postunlock(&wqh);
}
/**
@@ -436,12 +436,9 @@ void __sched rt_mutex_adjust_pi(struct task_struct *task)
/*
* Performs the wakeup of the top-waiter and re-enables preemption.
*/
-void __sched rt_mutex_postunlock(struct wake_q_head *wake_q)
+void __sched rt_mutex_postunlock(struct rt_mutex_wake_q_head *wqh)
{
- wake_up_q(wake_q);
-
- /* Pairs with preempt_disable() in mark_wakeup_next_waiter() */
- preempt_enable();
+ rt_mutex_wake_up_q(wqh);
}
#ifdef CONFIG_DEBUG_RT_MUTEXES
diff --git a/kernel/locking/rtmutex_common.h b/kernel/locking/rtmutex_common.h
index b1ea7fe88546..f6a453c4ad69 100644
--- a/kernel/locking/rtmutex_common.h
+++ b/kernel/locking/rtmutex_common.h
@@ -76,9 +76,9 @@ extern int __rt_mutex_futex_trylock(struct rt_mutex *l);
extern void rt_mutex_futex_unlock(struct rt_mutex *lock);
extern bool __rt_mutex_futex_unlock(struct rt_mutex *lock,
- struct wake_q_head *wake_q);
+ struct rt_mutex_wake_q_head *wqh);
-extern void rt_mutex_postunlock(struct wake_q_head *wake_q);
+extern void rt_mutex_postunlock(struct rt_mutex_wake_q_head *wqh);
/* Special interfaces for RT lock substitutions */
int rwsem_rt_mutex_slowlock_locked(struct rt_mutex *lock, unsigned int state);
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