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>
diff --git a/kernel/spinlock.c b/kernel/spinlock.c
index fbb5f8b..54eb7dd 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 @@
\
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 @@
\
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 @@
* __[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 @@
#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 @@
#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 @@
#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 @@
#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 @@
#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 @@
#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 @@
#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 @@
#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 @@
#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 @@
#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 @@
}
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 @@
}
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();