*/
#include <linux/spinlock.h>
+#include <linux/nmi.h>
#include <linux/interrupt.h>
+#include <linux/debug_locks.h>
#include <linux/delay.h>
+#include <linux/module.h>
+
+void __spin_lock_init(spinlock_t *lock, const char *name,
+ struct lock_class_key *key)
+{
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ /*
+ * Make sure we are not reinitializing a held lock:
+ */
+ debug_check_no_locks_freed((void *)lock, sizeof(*lock));
+ lockdep_init_map(&lock->dep_map, name, key, 0);
+#endif
+ lock->raw_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;
+ lock->magic = SPINLOCK_MAGIC;
+ lock->owner = SPINLOCK_OWNER_INIT;
+ lock->owner_cpu = -1;
+}
+
+EXPORT_SYMBOL(__spin_lock_init);
+
+void __rwlock_init(rwlock_t *lock, const char *name,
+ struct lock_class_key *key)
+{
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ /*
+ * Make sure we are not reinitializing a held lock:
+ */
+ debug_check_no_locks_freed((void *)lock, sizeof(*lock));
+ lockdep_init_map(&lock->dep_map, name, key, 0);
+#endif
+ lock->raw_lock = (arch_rwlock_t) __ARCH_RW_LOCK_UNLOCKED;
+ lock->magic = RWLOCK_MAGIC;
+ lock->owner = SPINLOCK_OWNER_INIT;
+ lock->owner_cpu = -1;
+}
+
+EXPORT_SYMBOL(__rwlock_init);
static void spin_bug(spinlock_t *lock, const char *msg)
{
- static long print_once = 1;
struct task_struct *owner = NULL;
- if (xchg(&print_once, 0)) {
- if (lock->owner && lock->owner != SPINLOCK_OWNER_INIT)
- owner = lock->owner;
- printk(KERN_EMERG "BUG: spinlock %s on CPU#%d, %s/%d\n",
- msg, raw_smp_processor_id(),
- current->comm, current->pid);
- printk(KERN_EMERG " lock: %p, .magic: %08x, .owner: %s/%d, "
- ".owner_cpu: %d\n",
- lock, lock->magic,
- owner ? owner->comm : "<none>",
- owner ? owner->pid : -1,
- lock->owner_cpu);
- dump_stack();
-#ifdef CONFIG_SMP
- /*
- * We cannot continue on SMP:
- */
-// panic("bad locking");
-#endif
- }
+ if (!debug_locks_off())
+ return;
+
+ if (lock->owner && lock->owner != SPINLOCK_OWNER_INIT)
+ owner = lock->owner;
+ printk(KERN_EMERG "BUG: spinlock %s on CPU#%d, %s/%d\n",
+ msg, raw_smp_processor_id(),
+ current->comm, task_pid_nr(current));
+ printk(KERN_EMERG " lock: %p, .magic: %08x, .owner: %s/%d, "
+ ".owner_cpu: %d\n",
+ lock, lock->magic,
+ owner ? owner->comm : "<none>",
+ owner ? task_pid_nr(owner) : -1,
+ lock->owner_cpu);
+ dump_stack();
}
#define SPIN_BUG_ON(cond, lock, msg) if (unlikely(cond)) spin_bug(lock, msg)
-static inline void debug_spin_lock_before(spinlock_t *lock)
+static inline void
+debug_spin_lock_before(spinlock_t *lock)
{
SPIN_BUG_ON(lock->magic != SPINLOCK_MAGIC, lock, "bad magic");
SPIN_BUG_ON(lock->owner == current, lock, "recursion");
static void __spin_lock_debug(spinlock_t *lock)
{
- int print_once = 1;
u64 i;
+ u64 loops = loops_per_jiffy * HZ;
+ int print_once = 1;
for (;;) {
- for (i = 0; i < loops_per_jiffy * HZ; i++) {
- if (__raw_spin_trylock(&lock->raw_lock))
+ for (i = 0; i < loops; i++) {
+ if (arch_spin_trylock(&lock->raw_lock))
return;
__delay(1);
}
printk(KERN_EMERG "BUG: spinlock lockup on CPU#%d, "
"%s/%d, %p\n",
raw_smp_processor_id(), current->comm,
- current->pid, lock);
+ task_pid_nr(current), lock);
dump_stack();
+#ifdef CONFIG_SMP
+ trigger_all_cpu_backtrace();
+#endif
}
}
}
void _raw_spin_lock(spinlock_t *lock)
{
debug_spin_lock_before(lock);
- if (unlikely(!__raw_spin_trylock(&lock->raw_lock)))
+ if (unlikely(!arch_spin_trylock(&lock->raw_lock)))
__spin_lock_debug(lock);
debug_spin_lock_after(lock);
}
int _raw_spin_trylock(spinlock_t *lock)
{
- int ret = __raw_spin_trylock(&lock->raw_lock);
+ int ret = arch_spin_trylock(&lock->raw_lock);
if (ret)
debug_spin_lock_after(lock);
void _raw_spin_unlock(spinlock_t *lock)
{
debug_spin_unlock(lock);
- __raw_spin_unlock(&lock->raw_lock);
+ arch_spin_unlock(&lock->raw_lock);
}
static void rwlock_bug(rwlock_t *lock, const char *msg)
{
- static long print_once = 1;
+ if (!debug_locks_off())
+ return;
- if (xchg(&print_once, 0)) {
- printk(KERN_EMERG "BUG: rwlock %s on CPU#%d, %s/%d, %p\n",
- msg, raw_smp_processor_id(), current->comm,
- current->pid, lock);
- dump_stack();
-#ifdef CONFIG_SMP
- /*
- * We cannot continue on SMP:
- */
- panic("bad locking");
-#endif
- }
+ printk(KERN_EMERG "BUG: rwlock %s on CPU#%d, %s/%d, %p\n",
+ msg, raw_smp_processor_id(), current->comm,
+ task_pid_nr(current), lock);
+ dump_stack();
}
#define RWLOCK_BUG_ON(cond, lock, msg) if (unlikely(cond)) rwlock_bug(lock, msg)
+#if 0 /* __write_lock_debug() can lock up - maybe this can too? */
static void __read_lock_debug(rwlock_t *lock)
{
- int print_once = 1;
u64 i;
+ u64 loops = loops_per_jiffy * HZ;
+ int print_once = 1;
for (;;) {
- for (i = 0; i < loops_per_jiffy * HZ; i++) {
- if (__raw_read_trylock(&lock->raw_lock))
+ for (i = 0; i < loops; i++) {
+ if (arch_read_trylock(&lock->raw_lock))
return;
__delay(1);
}
}
}
}
+#endif
void _raw_read_lock(rwlock_t *lock)
{
RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic");
- if (unlikely(!__raw_read_trylock(&lock->raw_lock)))
- __read_lock_debug(lock);
+ arch_read_lock(&lock->raw_lock);
}
int _raw_read_trylock(rwlock_t *lock)
{
- int ret = __raw_read_trylock(&lock->raw_lock);
+ int ret = arch_read_trylock(&lock->raw_lock);
#ifndef CONFIG_SMP
/*
void _raw_read_unlock(rwlock_t *lock)
{
RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic");
- __raw_read_unlock(&lock->raw_lock);
+ arch_read_unlock(&lock->raw_lock);
}
static inline void debug_write_lock_before(rwlock_t *lock)
lock->owner_cpu = -1;
}
+#if 0 /* This can cause lockups */
static void __write_lock_debug(rwlock_t *lock)
{
- int print_once = 1;
u64 i;
+ u64 loops = loops_per_jiffy * HZ;
+ int print_once = 1;
for (;;) {
- for (i = 0; i < loops_per_jiffy * HZ; i++) {
- if (__raw_write_trylock(&lock->raw_lock))
+ for (i = 0; i < loops; i++) {
+ if (arch_write_trylock(&lock->raw_lock))
return;
__delay(1);
}
}
}
}
+#endif
void _raw_write_lock(rwlock_t *lock)
{
debug_write_lock_before(lock);
- if (unlikely(!__raw_write_trylock(&lock->raw_lock)))
- __write_lock_debug(lock);
+ arch_write_lock(&lock->raw_lock);
debug_write_lock_after(lock);
}
int _raw_write_trylock(rwlock_t *lock)
{
- int ret = __raw_write_trylock(&lock->raw_lock);
+ int ret = arch_write_trylock(&lock->raw_lock);
if (ret)
debug_write_lock_after(lock);
void _raw_write_unlock(rwlock_t *lock)
{
debug_write_unlock(lock);
- __raw_write_unlock(&lock->raw_lock);
+ arch_write_unlock(&lock->raw_lock);
}
Code Review / linux-2.6.git / blobdiff