aboutsummaryrefslogtreecommitdiff
path: root/kernel/mutex.c
diff options
context:
space:
mode:
authorIngo Molnar <mingo@elte.hu>2006-06-26 00:24:31 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 09:58:16 -0700
commit1fb00c6cbd8356f43b46322742f3c01c2a1f02da (patch)
treed337fb8dca27a719221d9012292e72c55e7267d1 /kernel/mutex.c
parent20c5426f8155a89b6df06325f9b278f5052b8c7e (diff)
downloadlinaro-lsk-1fb00c6cbd8356f43b46322742f3c01c2a1f02da.tar.gz
[PATCH] work around ppc64 bootup bug by making mutex-debugging save/restore irqs
It seems ppc64 wants to lock mutexes in early bootup code, with interrupts disabled, and they expect interrupts to stay disabled, else they crash. Work around this bug by making mutex debugging variants save/restore irq flags. Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/mutex.c')
-rw-r--r--kernel/mutex.c21
1 files changed, 12 insertions, 9 deletions
diff --git a/kernel/mutex.c b/kernel/mutex.c
index 5449b210d9e..7043db21bbc 100644
--- a/kernel/mutex.c
+++ b/kernel/mutex.c
@@ -125,10 +125,11 @@ __mutex_lock_common(struct mutex *lock, long state __IP_DECL__)
struct task_struct *task = current;
struct mutex_waiter waiter;
unsigned int old_val;
+ unsigned long flags;
debug_mutex_init_waiter(&waiter);
- spin_lock_mutex(&lock->wait_lock);
+ spin_lock_mutex(&lock->wait_lock, flags);
debug_mutex_add_waiter(lock, &waiter, task->thread_info, ip);
@@ -157,7 +158,7 @@ __mutex_lock_common(struct mutex *lock, long state __IP_DECL__)
if (unlikely(state == TASK_INTERRUPTIBLE &&
signal_pending(task))) {
mutex_remove_waiter(lock, &waiter, task->thread_info);
- spin_unlock_mutex(&lock->wait_lock);
+ spin_unlock_mutex(&lock->wait_lock, flags);
debug_mutex_free_waiter(&waiter);
return -EINTR;
@@ -165,9 +166,9 @@ __mutex_lock_common(struct mutex *lock, long state __IP_DECL__)
__set_task_state(task, state);
/* didnt get the lock, go to sleep: */
- spin_unlock_mutex(&lock->wait_lock);
+ spin_unlock_mutex(&lock->wait_lock, flags);
schedule();
- spin_lock_mutex(&lock->wait_lock);
+ spin_lock_mutex(&lock->wait_lock, flags);
}
/* got the lock - rejoice! */
@@ -178,7 +179,7 @@ __mutex_lock_common(struct mutex *lock, long state __IP_DECL__)
if (likely(list_empty(&lock->wait_list)))
atomic_set(&lock->count, 0);
- spin_unlock_mutex(&lock->wait_lock);
+ spin_unlock_mutex(&lock->wait_lock, flags);
debug_mutex_free_waiter(&waiter);
@@ -203,10 +204,11 @@ static fastcall noinline void
__mutex_unlock_slowpath(atomic_t *lock_count __IP_DECL__)
{
struct mutex *lock = container_of(lock_count, struct mutex, count);
+ unsigned long flags;
DEBUG_WARN_ON(lock->owner != current_thread_info());
- spin_lock_mutex(&lock->wait_lock);
+ spin_lock_mutex(&lock->wait_lock, flags);
/*
* some architectures leave the lock unlocked in the fastpath failure
@@ -231,7 +233,7 @@ __mutex_unlock_slowpath(atomic_t *lock_count __IP_DECL__)
debug_mutex_clear_owner(lock);
- spin_unlock_mutex(&lock->wait_lock);
+ spin_unlock_mutex(&lock->wait_lock, flags);
}
/*
@@ -276,9 +278,10 @@ __mutex_lock_interruptible_slowpath(atomic_t *lock_count __IP_DECL__)
static inline int __mutex_trylock_slowpath(atomic_t *lock_count)
{
struct mutex *lock = container_of(lock_count, struct mutex, count);
+ unsigned long flags;
int prev;
- spin_lock_mutex(&lock->wait_lock);
+ spin_lock_mutex(&lock->wait_lock, flags);
prev = atomic_xchg(&lock->count, -1);
if (likely(prev == 1))
@@ -287,7 +290,7 @@ static inline int __mutex_trylock_slowpath(atomic_t *lock_count)
if (likely(list_empty(&lock->wait_list)))
atomic_set(&lock->count, 0);
- spin_unlock_mutex(&lock->wait_lock);
+ spin_unlock_mutex(&lock->wait_lock, flags);
return prev == 1;
}