From b9c16a0e1f733c97e48798b2a9362c485bb3b731 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Tue, 17 Jan 2017 16:06:09 +0100 Subject: [PATCH] locking/mutex: Fix lockdep_assert_held() fail In commit: 659cf9f5824a ("locking/ww_mutex: Optimize ww-mutexes by waking at most one waiter for backoff when acquiring the lock") I replaced a comment with a lockdep_assert_held(). However it turns out we hide that lock from lockdep for hysterical raisins, which results in the assertion always firing. Remove the old debug code as lockdep will easily spot the abuse it was meant to catch, which will make the lock visible to lockdep and make the assertion work as intended. Reported-by: Mike Galbraith Signed-off-by: Peter Zijlstra (Intel) Cc: Linus Torvalds Cc: Nicolai Haehnle Cc: Peter Zijlstra Cc: Thomas Gleixner Fixes: 659cf9f5824a ("locking/ww_mutex: Optimize ww-mutexes by waking at most one waiter for backoff when acquiring the lock") Link: http://lkml.kernel.org/r/20170117150609.GB32474@worktop Signed-off-by: Ingo Molnar --- kernel/locking/mutex-debug.h | 17 ----------------- kernel/locking/mutex.c | 25 +++++++++++-------------- kernel/locking/mutex.h | 4 ---- 3 files changed, 11 insertions(+), 35 deletions(-) diff --git a/kernel/locking/mutex-debug.h b/kernel/locking/mutex-debug.h index a459faa48987..4174417d5309 100644 --- a/kernel/locking/mutex-debug.h +++ b/kernel/locking/mutex-debug.h @@ -26,20 +26,3 @@ extern void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter, extern void debug_mutex_unlock(struct mutex *lock); extern void debug_mutex_init(struct mutex *lock, const char *name, struct lock_class_key *key); - -#define spin_lock_mutex(lock, flags) \ - do { \ - struct mutex *l = container_of(lock, struct mutex, wait_lock); \ - \ - DEBUG_LOCKS_WARN_ON(in_interrupt()); \ - local_irq_save(flags); \ - arch_spin_lock(&(lock)->rlock.raw_lock);\ - DEBUG_LOCKS_WARN_ON(l->magic != l); \ - } while (0) - -#define spin_unlock_mutex(lock, flags) \ - do { \ - arch_spin_unlock(&(lock)->rlock.raw_lock); \ - local_irq_restore(flags); \ - preempt_check_resched(); \ - } while (0) diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c index 935116723a3d..705e06fe5e6c 100644 --- a/kernel/locking/mutex.c +++ b/kernel/locking/mutex.c @@ -325,8 +325,6 @@ __ww_mutex_wakeup_for_backoff(struct mutex *lock, struct ww_acquire_ctx *ww_ctx) static __always_inline void ww_mutex_set_context_fastpath(struct ww_mutex *lock, struct ww_acquire_ctx *ctx) { - unsigned long flags; - ww_mutex_lock_acquired(lock, ctx); lock->ctx = ctx; @@ -350,9 +348,9 @@ ww_mutex_set_context_fastpath(struct ww_mutex *lock, struct ww_acquire_ctx *ctx) * Uh oh, we raced in fastpath, wake up everyone in this case, * so they can see the new lock->ctx. */ - spin_lock_mutex(&lock->base.wait_lock, flags); + spin_lock(&lock->base.wait_lock); __ww_mutex_wakeup_for_backoff(&lock->base, ctx); - spin_unlock_mutex(&lock->base.wait_lock, flags); + spin_unlock(&lock->base.wait_lock); } /* @@ -740,7 +738,6 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass, struct ww_acquire_ctx *ww_ctx, const bool use_ww_ctx) { struct mutex_waiter waiter; - unsigned long flags; bool first = false; struct ww_mutex *ww; int ret; @@ -766,7 +763,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass, return 0; } - spin_lock_mutex(&lock->wait_lock, flags); + spin_lock(&lock->wait_lock); /* * After waiting to acquire the wait_lock, try again. */ @@ -830,7 +827,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass, goto err; } - spin_unlock_mutex(&lock->wait_lock, flags); + spin_unlock(&lock->wait_lock); schedule_preempt_disabled(); /* @@ -853,9 +850,9 @@ __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_mutex(&lock->wait_lock, flags); + spin_lock(&lock->wait_lock); } - spin_lock_mutex(&lock->wait_lock, flags); + spin_lock(&lock->wait_lock); acquired: __set_current_state(TASK_RUNNING); @@ -872,7 +869,7 @@ skip_wait: if (use_ww_ctx && ww_ctx) ww_mutex_set_context_slowpath(ww, ww_ctx); - spin_unlock_mutex(&lock->wait_lock, flags); + spin_unlock(&lock->wait_lock); preempt_enable(); return 0; @@ -880,7 +877,7 @@ err: __set_current_state(TASK_RUNNING); mutex_remove_waiter(lock, &waiter, current); err_early_backoff: - spin_unlock_mutex(&lock->wait_lock, flags); + spin_unlock(&lock->wait_lock); debug_mutex_free_waiter(&waiter); mutex_release(&lock->dep_map, 1, ip); preempt_enable(); @@ -999,8 +996,8 @@ EXPORT_SYMBOL_GPL(ww_mutex_lock_interruptible); static noinline void __sched __mutex_unlock_slowpath(struct mutex *lock, unsigned long ip) { struct task_struct *next = NULL; - unsigned long owner, flags; DEFINE_WAKE_Q(wake_q); + unsigned long owner; mutex_release(&lock->dep_map, 1, ip); @@ -1035,7 +1032,7 @@ static noinline void __sched __mutex_unlock_slowpath(struct mutex *lock, unsigne owner = old; } - spin_lock_mutex(&lock->wait_lock, flags); + spin_lock(&lock->wait_lock); debug_mutex_unlock(lock); if (!list_empty(&lock->wait_list)) { /* get the first entry from the wait-list: */ @@ -1052,7 +1049,7 @@ static noinline void __sched __mutex_unlock_slowpath(struct mutex *lock, unsigne if (owner & MUTEX_FLAG_HANDOFF) __mutex_handoff(lock, next); - spin_unlock_mutex(&lock->wait_lock, flags); + spin_unlock(&lock->wait_lock); wake_up_q(&wake_q); } diff --git a/kernel/locking/mutex.h b/kernel/locking/mutex.h index 4410a4af42a3..6ebc1902f779 100644 --- a/kernel/locking/mutex.h +++ b/kernel/locking/mutex.h @@ -9,10 +9,6 @@ * !CONFIG_DEBUG_MUTEXES case. Most of them are NOPs: */ -#define spin_lock_mutex(lock, flags) \ - do { spin_lock(lock); (void)(flags); } while (0) -#define spin_unlock_mutex(lock, flags) \ - do { spin_unlock(lock); (void)(flags); } while (0) #define mutex_remove_waiter(lock, waiter, task) \ __list_del((waiter)->list.prev, (waiter)->list.next) -- 2.20.1