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locking/ww_mutex: Gather mutex_waiter initialization

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Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210815211304.281927514@linutronix.de
This commit is contained in:
Peter Zijlstra 2021-08-15 23:28:39 +02:00 • committed by Ingo Molnar
parent cf702eddcd
commit c0afb0ffc0
2 changed files with 4 additions and 9 deletions
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1
kernel/locking/mutex-debug.c
View file

@ -30,6 +30,7 @@ void debug_mutex_lock_common(struct mutex *lock, struct mutex_waiter *waiter)
memset(waiter, MUTEX_DEBUG_INIT, sizeof(*waiter)); memset(waiter, MUTEX_DEBUG_INIT, sizeof(*waiter));
waiter->magic = waiter; waiter->magic = waiter;
INIT_LIST_HEAD(&waiter->list); INIT_LIST_HEAD(&waiter->list);
waiter->ww_ctx = MUTEX_POISON_WW_CTX;
} }
void debug_mutex_wake_waiter(struct mutex *lock, struct mutex_waiter *waiter) void debug_mutex_wake_waiter(struct mutex *lock, struct mutex_waiter *waiter)

12
kernel/locking/mutex.c
View file

@ -982,17 +982,15 @@ __mutex_lock_common(struct mutex *lock, unsigned int state, unsigned int subclas
} }
debug_mutex_lock_common(lock, &waiter); debug_mutex_lock_common(lock, &waiter);
waiter.task = current;
if (ww_ctx)
waiter.ww_ctx = ww_ctx;
lock_contended(&lock->dep_map, ip); lock_contended(&lock->dep_map, ip);
if (!use_ww_ctx) { if (!use_ww_ctx) {
/* add waiting tasks to the end of the waitqueue (FIFO): */ /* add waiting tasks to the end of the waitqueue (FIFO): */
__mutex_add_waiter(lock, &waiter, &lock->wait_list); __mutex_add_waiter(lock, &waiter, &lock->wait_list);
#ifdef CONFIG_DEBUG_MUTEXES
waiter.ww_ctx = MUTEX_POISON_WW_CTX;
#endif
} else { } else {
/* /*
* Add in stamp order, waking up waiters that must kill * Add in stamp order, waking up waiters that must kill
@ -1001,12 +999,8 @@ __mutex_lock_common(struct mutex *lock, unsigned int state, unsigned int subclas
ret = __ww_mutex_add_waiter(&waiter, lock, ww_ctx); ret = __ww_mutex_add_waiter(&waiter, lock, ww_ctx);
if (ret) if (ret)
goto err_early_kill; goto err_early_kill;
waiter.ww_ctx = ww_ctx;
} }
waiter.task = current;
set_current_state(state); set_current_state(state);
for (;;) { for (;;) {
bool first; bool first;