cgroups: fix a css_set not found bug in cgroup_attach_proc
[linux-2.6.git] / kernel / spinlock.c
index 2c000f5..be6517f 100644 (file)
 #include <linux/debug_locks.h>
 #include <linux/module.h>
 
-int __lockfunc _spin_trylock(spinlock_t *lock)
-{
-       return __spin_trylock(lock);
-}
-EXPORT_SYMBOL(_spin_trylock);
-
-int __lockfunc _read_trylock(rwlock_t *lock)
-{
-       return __read_trylock(lock);
-}
-EXPORT_SYMBOL(_read_trylock);
-
-int __lockfunc _write_trylock(rwlock_t *lock)
-{
-       return __write_trylock(lock);
-}
-EXPORT_SYMBOL(_write_trylock);
-
 /*
  * If lockdep is enabled then we use the non-preemption spin-ops
  * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
  * not re-enabled during lock-acquire (which the preempt-spin-ops do):
  */
 #if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
-
-void __lockfunc _read_lock(rwlock_t *lock)
-{
-       __read_lock(lock);
-}
-EXPORT_SYMBOL(_read_lock);
-
-unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock)
-{
-       return __spin_lock_irqsave(lock);
-}
-EXPORT_SYMBOL(_spin_lock_irqsave);
-
-void __lockfunc _spin_lock_irq(spinlock_t *lock)
-{
-       __spin_lock_irq(lock);
-}
-EXPORT_SYMBOL(_spin_lock_irq);
-
-void __lockfunc _spin_lock_bh(spinlock_t *lock)
-{
-       __spin_lock_bh(lock);
-}
-EXPORT_SYMBOL(_spin_lock_bh);
-
-unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock)
-{
-       return __read_lock_irqsave(lock);
-}
-EXPORT_SYMBOL(_read_lock_irqsave);
-
-void __lockfunc _read_lock_irq(rwlock_t *lock)
-{
-       __read_lock_irq(lock);
-}
-EXPORT_SYMBOL(_read_lock_irq);
-
-void __lockfunc _read_lock_bh(rwlock_t *lock)
-{
-       __read_lock_bh(lock);
-}
-EXPORT_SYMBOL(_read_lock_bh);
-
-unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock)
-{
-       return __write_lock_irqsave(lock);
-}
-EXPORT_SYMBOL(_write_lock_irqsave);
-
-void __lockfunc _write_lock_irq(rwlock_t *lock)
-{
-       __write_lock_irq(lock);
-}
-EXPORT_SYMBOL(_write_lock_irq);
-
-void __lockfunc _write_lock_bh(rwlock_t *lock)
-{
-       __write_lock_bh(lock);
-}
-EXPORT_SYMBOL(_write_lock_bh);
-
-void __lockfunc _spin_lock(spinlock_t *lock)
-{
-       __spin_lock(lock);
-}
-EXPORT_SYMBOL(_spin_lock);
-
-void __lockfunc _write_lock(rwlock_t *lock)
-{
-       __write_lock(lock);
-}
-EXPORT_SYMBOL(_write_lock);
-
-#else /* CONFIG_PREEMPT: */
-
 /*
+ * The __lock_function inlines are taken from
+ * include/linux/spinlock_api_smp.h
+ */
+#else
+#define raw_read_can_lock(l)   read_can_lock(l)
+#define raw_write_can_lock(l)  write_can_lock(l)
+/*
+ * We build the __lock_function inlines here. They are too large for
+ * inlining all over the place, but here is only one user per function
+ * which embedds them into the calling _lock_function below.
+ *
  * This could be a long-held lock. We both prepare to spin for a long
  * time (making _this_ CPU preemptable if possible), and we also signal
  * towards that other CPU that it should break the lock ASAP.
- *
- * (We do this in a function because inlining it would be excessive.)
  */
-
 #define BUILD_LOCK_OPS(op, locktype)                                   \
-void __lockfunc _##op##_lock(locktype##_t *lock)                       \
+void __lockfunc __raw_##op##_lock(locktype##_t *lock)                  \
 {                                                                      \
        for (;;) {                                                      \
                preempt_disable();                                      \
-               if (likely(_raw_##op##_trylock(lock)))                  \
+               if (likely(do_raw_##op##_trylock(lock)))                \
                        break;                                          \
                preempt_enable();                                       \
                                                                        \
                if (!(lock)->break_lock)                                \
                        (lock)->break_lock = 1;                         \
-               while (!op##_can_lock(lock) && (lock)->break_lock)      \
-                       _raw_##op##_relax(&lock->raw_lock);             \
+               while (!raw_##op##_can_lock(lock) && (lock)->break_lock)\
+                       arch_##op##_relax(&lock->raw_lock);             \
        }                                                               \
        (lock)->break_lock = 0;                                         \
 }                                                                      \
                                                                        \
-EXPORT_SYMBOL(_##op##_lock);                                           \
-                                                                       \
-unsigned long __lockfunc _##op##_lock_irqsave(locktype##_t *lock)      \
+unsigned long __lockfunc __raw_##op##_lock_irqsave(locktype##_t *lock) \
 {                                                                      \
        unsigned long flags;                                            \
                                                                        \
        for (;;) {                                                      \
                preempt_disable();                                      \
                local_irq_save(flags);                                  \
-               if (likely(_raw_##op##_trylock(lock)))                  \
+               if (likely(do_raw_##op##_trylock(lock)))                \
                        break;                                          \
                local_irq_restore(flags);                               \
                preempt_enable();                                       \
                                                                        \
                if (!(lock)->break_lock)                                \
                        (lock)->break_lock = 1;                         \
-               while (!op##_can_lock(lock) && (lock)->break_lock)      \
-                       _raw_##op##_relax(&lock->raw_lock);             \
+               while (!raw_##op##_can_lock(lock) && (lock)->break_lock)\
+                       arch_##op##_relax(&lock->raw_lock);             \
        }                                                               \
        (lock)->break_lock = 0;                                         \
        return flags;                                                   \
 }                                                                      \
                                                                        \
-EXPORT_SYMBOL(_##op##_lock_irqsave);                                   \
-                                                                       \
-void __lockfunc _##op##_lock_irq(locktype##_t *lock)                   \
+void __lockfunc __raw_##op##_lock_irq(locktype##_t *lock)              \
 {                                                                      \
-       _##op##_lock_irqsave(lock);                                     \
+       _raw_##op##_lock_irqsave(lock);                                 \
 }                                                                      \
                                                                        \
-EXPORT_SYMBOL(_##op##_lock_irq);                                       \
-                                                                       \
-void __lockfunc _##op##_lock_bh(locktype##_t *lock)                    \
+void __lockfunc __raw_##op##_lock_bh(locktype##_t *lock)               \
 {                                                                      \
        unsigned long flags;                                            \
                                                                        \
@@ -186,139 +95,284 @@ void __lockfunc _##op##_lock_bh(locktype##_t *lock)                      \
        /* irq-disabling. We use the generic preemption-aware   */      \
        /* function:                                            */      \
        /**/                                                            \
-       flags = _##op##_lock_irqsave(lock);                             \
+       flags = _raw_##op##_lock_irqsave(lock);                         \
        local_bh_disable();                                             \
        local_irq_restore(flags);                                       \
 }                                                                      \
-                                                                       \
-EXPORT_SYMBOL(_##op##_lock_bh)
 
 /*
  * Build preemption-friendly versions of the following
  * lock-spinning functions:
  *
- *         _[spin|read|write]_lock()
- *         _[spin|read|write]_lock_irq()
- *         _[spin|read|write]_lock_irqsave()
- *         _[spin|read|write]_lock_bh()
+ *         __[spin|read|write]_lock()
+ *         __[spin|read|write]_lock_irq()
+ *         __[spin|read|write]_lock_irqsave()
+ *         __[spin|read|write]_lock_bh()
  */
-BUILD_LOCK_OPS(spin, spinlock);
+BUILD_LOCK_OPS(spin, raw_spinlock);
 BUILD_LOCK_OPS(read, rwlock);
 BUILD_LOCK_OPS(write, rwlock);
 
-#endif /* CONFIG_PREEMPT */
+#endif
 
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
+#ifndef CONFIG_INLINE_SPIN_TRYLOCK
+int __lockfunc _raw_spin_trylock(raw_spinlock_t *lock)
+{
+       return __raw_spin_trylock(lock);
+}
+EXPORT_SYMBOL(_raw_spin_trylock);
+#endif
 
-void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass)
+#ifndef CONFIG_INLINE_SPIN_TRYLOCK_BH
+int __lockfunc _raw_spin_trylock_bh(raw_spinlock_t *lock)
 {
-       preempt_disable();
-       spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
-       LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
+       return __raw_spin_trylock_bh(lock);
 }
-EXPORT_SYMBOL(_spin_lock_nested);
+EXPORT_SYMBOL(_raw_spin_trylock_bh);
+#endif
 
-unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock, int subclass)
+#ifndef CONFIG_INLINE_SPIN_LOCK
+void __lockfunc _raw_spin_lock(raw_spinlock_t *lock)
 {
-       unsigned long flags;
+       __raw_spin_lock(lock);
+}
+EXPORT_SYMBOL(_raw_spin_lock);
+#endif
 
-       local_irq_save(flags);
-       preempt_disable();
-       spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
-       LOCK_CONTENDED_FLAGS(lock, _raw_spin_trylock, _raw_spin_lock,
-                               _raw_spin_lock_flags, &flags);
-       return flags;
+#ifndef CONFIG_INLINE_SPIN_LOCK_IRQSAVE
+unsigned long __lockfunc _raw_spin_lock_irqsave(raw_spinlock_t *lock)
+{
+       return __raw_spin_lock_irqsave(lock);
 }
-EXPORT_SYMBOL(_spin_lock_irqsave_nested);
+EXPORT_SYMBOL(_raw_spin_lock_irqsave);
+#endif
 
-void __lockfunc _spin_lock_nest_lock(spinlock_t *lock,
-                                    struct lockdep_map *nest_lock)
+#ifndef CONFIG_INLINE_SPIN_LOCK_IRQ
+void __lockfunc _raw_spin_lock_irq(raw_spinlock_t *lock)
 {
-       preempt_disable();
-       spin_acquire_nest(&lock->dep_map, 0, 0, nest_lock, _RET_IP_);
-       LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
+       __raw_spin_lock_irq(lock);
 }
-EXPORT_SYMBOL(_spin_lock_nest_lock);
+EXPORT_SYMBOL(_raw_spin_lock_irq);
+#endif
+
+#ifndef CONFIG_INLINE_SPIN_LOCK_BH
+void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock)
+{
+       __raw_spin_lock_bh(lock);
+}
+EXPORT_SYMBOL(_raw_spin_lock_bh);
+#endif
+
+#ifndef CONFIG_INLINE_SPIN_UNLOCK
+void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock)
+{
+       __raw_spin_unlock(lock);
+}
+EXPORT_SYMBOL(_raw_spin_unlock);
+#endif
+
+#ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE
+void __lockfunc _raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags)
+{
+       __raw_spin_unlock_irqrestore(lock, flags);
+}
+EXPORT_SYMBOL(_raw_spin_unlock_irqrestore);
+#endif
+
+#ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQ
+void __lockfunc _raw_spin_unlock_irq(raw_spinlock_t *lock)
+{
+       __raw_spin_unlock_irq(lock);
+}
+EXPORT_SYMBOL(_raw_spin_unlock_irq);
+#endif
+
+#ifndef CONFIG_INLINE_SPIN_UNLOCK_BH
+void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock)
+{
+       __raw_spin_unlock_bh(lock);
+}
+EXPORT_SYMBOL(_raw_spin_unlock_bh);
+#endif
+
+#ifndef CONFIG_INLINE_READ_TRYLOCK
+int __lockfunc _raw_read_trylock(rwlock_t *lock)
+{
+       return __raw_read_trylock(lock);
+}
+EXPORT_SYMBOL(_raw_read_trylock);
+#endif
+
+#ifndef CONFIG_INLINE_READ_LOCK
+void __lockfunc _raw_read_lock(rwlock_t *lock)
+{
+       __raw_read_lock(lock);
+}
+EXPORT_SYMBOL(_raw_read_lock);
+#endif
+
+#ifndef CONFIG_INLINE_READ_LOCK_IRQSAVE
+unsigned long __lockfunc _raw_read_lock_irqsave(rwlock_t *lock)
+{
+       return __raw_read_lock_irqsave(lock);
+}
+EXPORT_SYMBOL(_raw_read_lock_irqsave);
+#endif
+
+#ifndef CONFIG_INLINE_READ_LOCK_IRQ
+void __lockfunc _raw_read_lock_irq(rwlock_t *lock)
+{
+       __raw_read_lock_irq(lock);
+}
+EXPORT_SYMBOL(_raw_read_lock_irq);
+#endif
+
+#ifndef CONFIG_INLINE_READ_LOCK_BH
+void __lockfunc _raw_read_lock_bh(rwlock_t *lock)
+{
+       __raw_read_lock_bh(lock);
+}
+EXPORT_SYMBOL(_raw_read_lock_bh);
+#endif
 
+#ifndef CONFIG_INLINE_READ_UNLOCK
+void __lockfunc _raw_read_unlock(rwlock_t *lock)
+{
+       __raw_read_unlock(lock);
+}
+EXPORT_SYMBOL(_raw_read_unlock);
 #endif
 
-void __lockfunc _spin_unlock(spinlock_t *lock)
+#ifndef CONFIG_INLINE_READ_UNLOCK_IRQRESTORE
+void __lockfunc _raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
 {
-       __spin_unlock(lock);
+       __raw_read_unlock_irqrestore(lock, flags);
 }
-EXPORT_SYMBOL(_spin_unlock);
+EXPORT_SYMBOL(_raw_read_unlock_irqrestore);
+#endif
 
-void __lockfunc _write_unlock(rwlock_t *lock)
+#ifndef CONFIG_INLINE_READ_UNLOCK_IRQ
+void __lockfunc _raw_read_unlock_irq(rwlock_t *lock)
 {
-       __write_unlock(lock);
+       __raw_read_unlock_irq(lock);
 }
-EXPORT_SYMBOL(_write_unlock);
+EXPORT_SYMBOL(_raw_read_unlock_irq);
+#endif
 
-void __lockfunc _read_unlock(rwlock_t *lock)
+#ifndef CONFIG_INLINE_READ_UNLOCK_BH
+void __lockfunc _raw_read_unlock_bh(rwlock_t *lock)
 {
-       __read_unlock(lock);
+       __raw_read_unlock_bh(lock);
 }
-EXPORT_SYMBOL(_read_unlock);
+EXPORT_SYMBOL(_raw_read_unlock_bh);
+#endif
 
-void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
+#ifndef CONFIG_INLINE_WRITE_TRYLOCK
+int __lockfunc _raw_write_trylock(rwlock_t *lock)
 {
-       __spin_unlock_irqrestore(lock, flags);
+       return __raw_write_trylock(lock);
 }
-EXPORT_SYMBOL(_spin_unlock_irqrestore);
+EXPORT_SYMBOL(_raw_write_trylock);
+#endif
 
-void __lockfunc _spin_unlock_irq(spinlock_t *lock)
+#ifndef CONFIG_INLINE_WRITE_LOCK
+void __lockfunc _raw_write_lock(rwlock_t *lock)
 {
-       __spin_unlock_irq(lock);
+       __raw_write_lock(lock);
 }
-EXPORT_SYMBOL(_spin_unlock_irq);
+EXPORT_SYMBOL(_raw_write_lock);
+#endif
 
-void __lockfunc _spin_unlock_bh(spinlock_t *lock)
+#ifndef CONFIG_INLINE_WRITE_LOCK_IRQSAVE
+unsigned long __lockfunc _raw_write_lock_irqsave(rwlock_t *lock)
 {
-       __spin_unlock_bh(lock);
+       return __raw_write_lock_irqsave(lock);
 }
-EXPORT_SYMBOL(_spin_unlock_bh);
+EXPORT_SYMBOL(_raw_write_lock_irqsave);
+#endif
+
+#ifndef CONFIG_INLINE_WRITE_LOCK_IRQ
+void __lockfunc _raw_write_lock_irq(rwlock_t *lock)
+{
+       __raw_write_lock_irq(lock);
+}
+EXPORT_SYMBOL(_raw_write_lock_irq);
+#endif
+
+#ifndef CONFIG_INLINE_WRITE_LOCK_BH
+void __lockfunc _raw_write_lock_bh(rwlock_t *lock)
+{
+       __raw_write_lock_bh(lock);
+}
+EXPORT_SYMBOL(_raw_write_lock_bh);
+#endif
 
-void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
+#ifndef CONFIG_INLINE_WRITE_UNLOCK
+void __lockfunc _raw_write_unlock(rwlock_t *lock)
 {
-       __read_unlock_irqrestore(lock, flags);
+       __raw_write_unlock(lock);
 }
-EXPORT_SYMBOL(_read_unlock_irqrestore);
+EXPORT_SYMBOL(_raw_write_unlock);
+#endif
 
-void __lockfunc _read_unlock_irq(rwlock_t *lock)
+#ifndef CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE
+void __lockfunc _raw_write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
 {
-       __read_unlock_irq(lock);
+       __raw_write_unlock_irqrestore(lock, flags);
 }
-EXPORT_SYMBOL(_read_unlock_irq);
+EXPORT_SYMBOL(_raw_write_unlock_irqrestore);
+#endif
 
-void __lockfunc _read_unlock_bh(rwlock_t *lock)
+#ifndef CONFIG_INLINE_WRITE_UNLOCK_IRQ
+void __lockfunc _raw_write_unlock_irq(rwlock_t *lock)
 {
-       __read_unlock_bh(lock);
+       __raw_write_unlock_irq(lock);
 }
-EXPORT_SYMBOL(_read_unlock_bh);
+EXPORT_SYMBOL(_raw_write_unlock_irq);
+#endif
 
-void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
+#ifndef CONFIG_INLINE_WRITE_UNLOCK_BH
+void __lockfunc _raw_write_unlock_bh(rwlock_t *lock)
 {
-       __write_unlock_irqrestore(lock, flags);
+       __raw_write_unlock_bh(lock);
 }
-EXPORT_SYMBOL(_write_unlock_irqrestore);
+EXPORT_SYMBOL(_raw_write_unlock_bh);
+#endif
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
 
-void __lockfunc _write_unlock_irq(rwlock_t *lock)
+void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass)
 {
-       __write_unlock_irq(lock);
+       preempt_disable();
+       spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
+       LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
 }
-EXPORT_SYMBOL(_write_unlock_irq);
+EXPORT_SYMBOL(_raw_spin_lock_nested);
 
-void __lockfunc _write_unlock_bh(rwlock_t *lock)
+unsigned long __lockfunc _raw_spin_lock_irqsave_nested(raw_spinlock_t *lock,
+                                                  int subclass)
 {
-       __write_unlock_bh(lock);
+       unsigned long flags;
+
+       local_irq_save(flags);
+       preempt_disable();
+       spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
+       LOCK_CONTENDED_FLAGS(lock, do_raw_spin_trylock, do_raw_spin_lock,
+                               do_raw_spin_lock_flags, &flags);
+       return flags;
 }
-EXPORT_SYMBOL(_write_unlock_bh);
+EXPORT_SYMBOL(_raw_spin_lock_irqsave_nested);
 
-int __lockfunc _spin_trylock_bh(spinlock_t *lock)
+void __lockfunc _raw_spin_lock_nest_lock(raw_spinlock_t *lock,
+                                    struct lockdep_map *nest_lock)
 {
-       return __spin_trylock_bh(lock);
+       preempt_disable();
+       spin_acquire_nest(&lock->dep_map, 0, 0, nest_lock, _RET_IP_);
+       LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
 }
-EXPORT_SYMBOL(_spin_trylock_bh);
+EXPORT_SYMBOL(_raw_spin_lock_nest_lock);
+
+#endif
 
 notrace int in_lock_functions(unsigned long addr)
 {