locking: Implement new raw_spinlock

Now that the raw_spin name space is freed up, we can implement
raw_spinlock and the related functions which are used to annotate the
locks which are not converted to sleeping spinlocks in preempt-rt.

A side effect is that only such locks can be used with the low level
lock fsunctions which circumvent lockdep.

For !rt spin_* functions are mapped to the raw_spin* implementations.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 25 insertions, 23 deletions

diff --git a/kernel/mutex-debug.h b/kernel/mutex-debug.h
index 7bebbd15b342..57d527a16f9d 100644
--- a/kernel/mutex-debug.h
+++ b/kernel/mutex-debug.h
@@ -43,13 +43,13 @@ static inline void mutex_clear_owner(struct mutex *lock)
                                                         \
                 DEBUG_LOCKS_WARN_ON(in_interrupt());    \
                 local_irq_save(flags);                  \
-                arch_spin_lock(&(lock)->raw_lock);      \
+                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)->raw_lock);    \
-                local_irq_restore(flags);               \
-                preempt_check_resched();                \
+#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/sched.c b/kernel/sched.c
index fd05861b2111..e6acf2d7b753 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -884,7 +884,7 @@ static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev)
 {
 #ifdef CONFIG_DEBUG_SPINLOCK
         /* this is a valid case when another task releases the spinlock */
-        rq->lock.owner = current;
+        rq->lock.rlock.owner = current;
 #endif
         /*
          * If we are tracking spinlock dependencies then we have to
diff --git a/kernel/spinlock.c b/kernel/spinlock.c
index fbb5f8b78357..54eb7dd3c608 100644
--- a/kernel/spinlock.c
+++ b/kernel/spinlock.c
@@ -32,6 +32,8 @@
  * 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
@@ -52,7 +54,7 @@ void __lockfunc __##op##_lock(locktype##_t *lock)			\
                                                                         \
                 if (!(lock)->break_lock)                                \
                         (lock)->break_lock = 1;                         \
-                while (!op##_can_lock(lock) && (lock)->break_lock)      \
+                while (!raw_##op##_can_lock(lock) && (lock)->break_lock)\
                         arch_##op##_relax(&lock->raw_lock);             \
         }                                                               \
         (lock)->break_lock = 0;                                         \
@@ -72,7 +74,7 @@ unsigned long __lockfunc __##op##_lock_irqsave(locktype##_t *lock)	\
                                                                         \
                 if (!(lock)->break_lock)                                \
                         (lock)->break_lock = 1;                         \
-                while (!op##_can_lock(lock) && (lock)->break_lock)      \
+                while (!raw_##op##_can_lock(lock) && (lock)->break_lock)\
                         arch_##op##_relax(&lock->raw_lock);             \
         }                                                               \
         (lock)->break_lock = 0;                                         \
@@ -107,14 +109,14 @@ void __lockfunc __##op##_lock_bh(locktype##_t *lock)			\
  *         __[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
 
 #ifndef CONFIG_INLINE_SPIN_TRYLOCK
-int __lockfunc _spin_trylock(spinlock_t *lock)
+int __lockfunc _spin_trylock(raw_spinlock_t *lock)
 {
         return __spin_trylock(lock);
 }
@@ -122,7 +124,7 @@ EXPORT_SYMBOL(_spin_trylock);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_TRYLOCK_BH
-int __lockfunc _spin_trylock_bh(spinlock_t *lock)
+int __lockfunc _spin_trylock_bh(raw_spinlock_t *lock)
 {
         return __spin_trylock_bh(lock);
 }
@@ -130,7 +132,7 @@ EXPORT_SYMBOL(_spin_trylock_bh);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_LOCK
-void __lockfunc _spin_lock(spinlock_t *lock)
+void __lockfunc _spin_lock(raw_spinlock_t *lock)
 {
         __spin_lock(lock);
 }
@@ -138,7 +140,7 @@ EXPORT_SYMBOL(_spin_lock);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_LOCK_IRQSAVE
-unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock)
+unsigned long __lockfunc _spin_lock_irqsave(raw_spinlock_t *lock)
 {
         return __spin_lock_irqsave(lock);
 }
@@ -146,7 +148,7 @@ EXPORT_SYMBOL(_spin_lock_irqsave);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_LOCK_IRQ
-void __lockfunc _spin_lock_irq(spinlock_t *lock)
+void __lockfunc _spin_lock_irq(raw_spinlock_t *lock)
 {
         __spin_lock_irq(lock);
 }
@@ -154,7 +156,7 @@ EXPORT_SYMBOL(_spin_lock_irq);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_LOCK_BH
-void __lockfunc _spin_lock_bh(spinlock_t *lock)
+void __lockfunc _spin_lock_bh(raw_spinlock_t *lock)
 {
         __spin_lock_bh(lock);
 }
@@ -162,7 +164,7 @@ EXPORT_SYMBOL(_spin_lock_bh);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_UNLOCK
-void __lockfunc _spin_unlock(spinlock_t *lock)
+void __lockfunc _spin_unlock(raw_spinlock_t *lock)
 {
         __spin_unlock(lock);
 }
@@ -170,7 +172,7 @@ EXPORT_SYMBOL(_spin_unlock);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE
-void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
+void __lockfunc _spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags)
 {
         __spin_unlock_irqrestore(lock, flags);
 }
@@ -178,7 +180,7 @@ EXPORT_SYMBOL(_spin_unlock_irqrestore);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQ
-void __lockfunc _spin_unlock_irq(spinlock_t *lock)
+void __lockfunc _spin_unlock_irq(raw_spinlock_t *lock)
 {
         __spin_unlock_irq(lock);
 }
@@ -186,7 +188,7 @@ EXPORT_SYMBOL(_spin_unlock_irq);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_UNLOCK_BH
-void __lockfunc _spin_unlock_bh(spinlock_t *lock)
+void __lockfunc _spin_unlock_bh(raw_spinlock_t *lock)
 {
         __spin_unlock_bh(lock);
 }
@@ -339,7 +341,7 @@ EXPORT_SYMBOL(_write_unlock_bh);
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 
-void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass)
+void __lockfunc _spin_lock_nested(raw_spinlock_t *lock, int subclass)
 {
         preempt_disable();
         spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
@@ -347,7 +349,7 @@ void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass)
 }
 EXPORT_SYMBOL(_spin_lock_nested);
 
-unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock,
+unsigned long __lockfunc _spin_lock_irqsave_nested(raw_spinlock_t *lock,
                                                    int subclass)
 {
         unsigned long flags;
@@ -361,7 +363,7 @@ unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock,
 }
 EXPORT_SYMBOL(_spin_lock_irqsave_nested);
 
-void __lockfunc _spin_lock_nest_lock(spinlock_t *lock,
+void __lockfunc _spin_lock_nest_lock(raw_spinlock_t *lock,
                                      struct lockdep_map *nest_lock)
 {
         preempt_disable();