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Message-Id: <20181009092434.26221-2-juri.lelli@redhat.com>
Date: Tue, 9 Oct 2018 11:24:27 +0200
From: Juri Lelli <juri.lelli@...hat.com>
To: peterz@...radead.org, mingo@...hat.com
Cc: rostedt@...dmis.org, tglx@...utronix.de,
linux-kernel@...r.kernel.org, luca.abeni@...tannapisa.it,
claudio@...dence.eu.com, tommaso.cucinotta@...tannapisa.it,
alessio.balsini@...il.com, bristot@...hat.com, will.deacon@....com,
andrea.parri@...rulasolutions.com, dietmar.eggemann@....com,
patrick.bellasi@....com, henrik@...tad.us,
linux-rt-users@...r.kernel.org
Subject: [RFD/RFC PATCH 1/8] locking/mutex: Convert mutex::wait_lock to raw_spinlock_t
From: Peter Zijlstra <peterz@...radead.org>
In preparation to nest mutex::wait_lock under rq::lock it needs to be
raw_spinlock_t.
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
---
include/linux/mutex.h | 4 ++--
kernel/locking/mutex-debug.c | 4 ++--
kernel/locking/mutex.c | 22 +++++++++++-----------
3 files changed, 15 insertions(+), 15 deletions(-)
diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index 3093dd162424..725aa113626f 100644
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -52,7 +52,7 @@ struct ww_acquire_ctx;
*/
struct mutex {
atomic_long_t owner;
- spinlock_t wait_lock;
+ raw_spinlock_t wait_lock;
#ifdef CONFIG_MUTEX_SPIN_ON_OWNER
struct optimistic_spin_queue osq; /* Spinner MCS lock */
#endif
@@ -127,7 +127,7 @@ do { \
#define __MUTEX_INITIALIZER(lockname) \
{ .owner = ATOMIC_LONG_INIT(0) \
- , .wait_lock = __SPIN_LOCK_UNLOCKED(lockname.wait_lock) \
+ , .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(lockname.wait_lock) \
, .wait_list = LIST_HEAD_INIT(lockname.wait_list) \
__DEBUG_MUTEX_INITIALIZER(lockname) \
__DEP_MAP_MUTEX_INITIALIZER(lockname) }
diff --git a/kernel/locking/mutex-debug.c b/kernel/locking/mutex-debug.c
index 9aa713629387..a660d38b6c29 100644
--- a/kernel/locking/mutex-debug.c
+++ b/kernel/locking/mutex-debug.c
@@ -36,7 +36,7 @@ void debug_mutex_lock_common(struct mutex *lock, struct mutex_waiter *waiter)
void debug_mutex_wake_waiter(struct mutex *lock, struct mutex_waiter *waiter)
{
- SMP_DEBUG_LOCKS_WARN_ON(!spin_is_locked(&lock->wait_lock));
+ SMP_DEBUG_LOCKS_WARN_ON(!raw_spin_is_locked(&lock->wait_lock));
DEBUG_LOCKS_WARN_ON(list_empty(&lock->wait_list));
DEBUG_LOCKS_WARN_ON(waiter->magic != waiter);
DEBUG_LOCKS_WARN_ON(list_empty(&waiter->list));
@@ -51,7 +51,7 @@ void debug_mutex_free_waiter(struct mutex_waiter *waiter)
void debug_mutex_add_waiter(struct mutex *lock, struct mutex_waiter *waiter,
struct task_struct *task)
{
- SMP_DEBUG_LOCKS_WARN_ON(!spin_is_locked(&lock->wait_lock));
+ SMP_DEBUG_LOCKS_WARN_ON(!raw_spin_is_locked(&lock->wait_lock));
/* Mark the current thread as blocked on the lock: */
task->blocked_on = waiter;
diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c
index 3f8a35104285..df34ce70fcde 100644
--- a/kernel/locking/mutex.c
+++ b/kernel/locking/mutex.c
@@ -39,7 +39,7 @@ void
__mutex_init(struct mutex *lock, const char *name, struct lock_class_key *key)
{
atomic_long_set(&lock->owner, 0);
- spin_lock_init(&lock->wait_lock);
+ raw_spin_lock_init(&lock->wait_lock);
INIT_LIST_HEAD(&lock->wait_list);
#ifdef CONFIG_MUTEX_SPIN_ON_OWNER
osq_lock_init(&lock->osq);
@@ -464,9 +464,9 @@ ww_mutex_set_context_fastpath(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
* Uh oh, we raced in fastpath, check if any of the waiters need to
* die or wound us.
*/
- spin_lock(&lock->base.wait_lock);
+ raw_spin_lock(&lock->base.wait_lock);
__ww_mutex_check_waiters(&lock->base, ctx);
- spin_unlock(&lock->base.wait_lock);
+ raw_spin_unlock(&lock->base.wait_lock);
}
#ifdef CONFIG_MUTEX_SPIN_ON_OWNER
@@ -934,7 +934,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
return 0;
}
- spin_lock(&lock->wait_lock);
+ raw_spin_lock(&lock->wait_lock);
/*
* After waiting to acquire the wait_lock, try again.
*/
@@ -998,7 +998,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
goto err;
}
- spin_unlock(&lock->wait_lock);
+ raw_spin_unlock(&lock->wait_lock);
schedule_preempt_disabled();
/*
@@ -1021,9 +1021,9 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
(first && mutex_optimistic_spin(lock, ww_ctx, use_ww_ctx, &waiter)))
break;
- spin_lock(&lock->wait_lock);
+ raw_spin_lock(&lock->wait_lock);
}
- spin_lock(&lock->wait_lock);
+ raw_spin_lock(&lock->wait_lock);
acquired:
__set_current_state(TASK_RUNNING);
@@ -1050,7 +1050,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
if (use_ww_ctx && ww_ctx)
ww_mutex_lock_acquired(ww, ww_ctx);
- spin_unlock(&lock->wait_lock);
+ raw_spin_unlock(&lock->wait_lock);
preempt_enable();
return 0;
@@ -1058,7 +1058,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
__set_current_state(TASK_RUNNING);
mutex_remove_waiter(lock, &waiter, current);
err_early_kill:
- spin_unlock(&lock->wait_lock);
+ raw_spin_unlock(&lock->wait_lock);
debug_mutex_free_waiter(&waiter);
mutex_release(&lock->dep_map, 1, ip);
preempt_enable();
@@ -1227,7 +1227,7 @@ static noinline void __sched __mutex_unlock_slowpath(struct mutex *lock, unsigne
owner = old;
}
- spin_lock(&lock->wait_lock);
+ raw_spin_lock(&lock->wait_lock);
debug_mutex_unlock(lock);
if (!list_empty(&lock->wait_list)) {
/* get the first entry from the wait-list: */
@@ -1244,7 +1244,7 @@ static noinline void __sched __mutex_unlock_slowpath(struct mutex *lock, unsigne
if (owner & MUTEX_FLAG_HANDOFF)
__mutex_handoff(lock, next);
- spin_unlock(&lock->wait_lock);
+ raw_spin_unlock(&lock->wait_lock);
wake_up_q(&wake_q);
}
--
2.17.1
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