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locking: Implement new raw_spinlock

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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>
This commit is contained in:
Thomas Gleixner 2009-12-02 20:02:59 +01:00
parent e5931943d0
commit c2f21ce2e3
8 changed files with 297 additions and 135 deletions
Download patch file Download diff file Expand all files Collapse all files

24
lib/spinlock_debug.c
View file

@ -13,8 +13,8 @@
#include <linux/delay.h>
#include <linux/module.h>
void __spin_lock_init(spinlock_t *lock, const char *name,
struct lock_class_key *key)
void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name,
struct lock_class_key *key)
{
#ifdef CONFIG_DEBUG_LOCK_ALLOC
/*
@ -29,7 +29,7 @@ void __spin_lock_init(spinlock_t *lock, const char *name,
lock->owner_cpu = -1;
}
EXPORT_SYMBOL(__spin_lock_init);
EXPORT_SYMBOL(__raw_spin_lock_init);
void __rwlock_init(rwlock_t *lock, const char *name,
struct lock_class_key *key)
@ -49,7 +49,7 @@ void __rwlock_init(rwlock_t *lock, const char *name,
EXPORT_SYMBOL(__rwlock_init);
static void spin_bug(spinlock_t *lock, const char *msg)
static void spin_bug(raw_spinlock_t *lock, const char *msg)
{
struct task_struct *owner = NULL;
@ -73,7 +73,7 @@ static void spin_bug(spinlock_t *lock, const char *msg)
#define SPIN_BUG_ON(cond, lock, msg) if (unlikely(cond)) spin_bug(lock, msg)
static inline void
debug_spin_lock_before(spinlock_t *lock)
debug_spin_lock_before(raw_spinlock_t *lock)
{
SPIN_BUG_ON(lock->magic != SPINLOCK_MAGIC, lock, "bad magic");
SPIN_BUG_ON(lock->owner == current, lock, "recursion");
@ -81,16 +81,16 @@ debug_spin_lock_before(spinlock_t *lock)
lock, "cpu recursion");
}
static inline void debug_spin_lock_after(spinlock_t *lock)
static inline void debug_spin_lock_after(raw_spinlock_t *lock)
{
lock->owner_cpu = raw_smp_processor_id();
lock->owner = current;
}
static inline void debug_spin_unlock(spinlock_t *lock)
static inline void debug_spin_unlock(raw_spinlock_t *lock)
{
SPIN_BUG_ON(lock->magic != SPINLOCK_MAGIC, lock, "bad magic");
SPIN_BUG_ON(!spin_is_locked(lock), lock, "already unlocked");
SPIN_BUG_ON(!raw_spin_is_locked(lock), lock, "already unlocked");
SPIN_BUG_ON(lock->owner != current, lock, "wrong owner");
SPIN_BUG_ON(lock->owner_cpu != raw_smp_processor_id(),
lock, "wrong CPU");
@ -98,7 +98,7 @@ static inline void debug_spin_unlock(spinlock_t *lock)
lock->owner_cpu = -1;
}
static void __spin_lock_debug(spinlock_t *lock)
static void __spin_lock_debug(raw_spinlock_t *lock)
{
u64 i;
u64 loops = loops_per_jiffy * HZ;
@ -125,7 +125,7 @@ static void __spin_lock_debug(spinlock_t *lock)
}
}
void _raw_spin_lock(spinlock_t *lock)
void _raw_spin_lock(raw_spinlock_t *lock)
{
debug_spin_lock_before(lock);
if (unlikely(!arch_spin_trylock(&lock->raw_lock)))
@ -133,7 +133,7 @@ void _raw_spin_lock(spinlock_t *lock)
debug_spin_lock_after(lock);
}
int _raw_spin_trylock(spinlock_t *lock)
int _raw_spin_trylock(raw_spinlock_t *lock)
{
int ret = arch_spin_trylock(&lock->raw_lock);
@ -148,7 +148,7 @@ int _raw_spin_trylock(spinlock_t *lock)
return ret;
}
void _raw_spin_unlock(spinlock_t *lock)
void _raw_spin_unlock(raw_spinlock_t *lock)
{
debug_spin_unlock(lock);
arch_spin_unlock(&lock->raw_lock);