aboutsummaryrefslogtreecommitdiffstats
path: root/kernel/spinlock.c
diff options
context:
space:
mode:
authorIngo Molnar <mingo@elte.hu>2006-07-03 00:24:54 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-03 15:27:04 -0700
commit8a25d5debff2daee280e83e09d8c25d67c26a972 (patch)
tree3bccfef9acb66fc62863bfd6c16493c5e8c8e394 /kernel/spinlock.c
parent4ea2176dfa714882e88180b474e4cbcd888b70af (diff)
[PATCH] lockdep: prove spinlock rwlock locking correctness
Use the lock validator framework to prove spinlock and rwlock locking correctness. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/spinlock.c')
-rw-r--r--kernel/spinlock.c79
1 files changed, 70 insertions, 9 deletions
diff --git a/kernel/spinlock.c b/kernel/spinlock.c
index b31e54eadf56..bfd6ad9c0330 100644
--- a/kernel/spinlock.c
+++ b/kernel/spinlock.c
@@ -13,6 +13,7 @@
#include <linux/preempt.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
+#include <linux/debug_locks.h>
#include <linux/module.h>
/*
@@ -29,8 +30,10 @@ EXPORT_SYMBOL(generic__raw_read_trylock);
int __lockfunc _spin_trylock(spinlock_t *lock)
{
preempt_disable();
- if (_raw_spin_trylock(lock))
+ if (_raw_spin_trylock(lock)) {
+ spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
return 1;
+ }
preempt_enable();
return 0;
@@ -40,8 +43,10 @@ EXPORT_SYMBOL(_spin_trylock);
int __lockfunc _read_trylock(rwlock_t *lock)
{
preempt_disable();
- if (_raw_read_trylock(lock))
+ if (_raw_read_trylock(lock)) {
+ rwlock_acquire_read(&lock->dep_map, 0, 1, _RET_IP_);
return 1;
+ }
preempt_enable();
return 0;
@@ -51,19 +56,28 @@ EXPORT_SYMBOL(_read_trylock);
int __lockfunc _write_trylock(rwlock_t *lock)
{
preempt_disable();
- if (_raw_write_trylock(lock))
+ if (_raw_write_trylock(lock)) {
+ rwlock_acquire(&lock->dep_map, 0, 1, _RET_IP_);
return 1;
+ }
preempt_enable();
return 0;
}
EXPORT_SYMBOL(_write_trylock);
-#if !defined(CONFIG_PREEMPT) || !defined(CONFIG_SMP)
+/*
+ * 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_PREEMPT) || !defined(CONFIG_SMP) || \
+ defined(CONFIG_PROVE_LOCKING)
void __lockfunc _read_lock(rwlock_t *lock)
{
preempt_disable();
+ rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
_raw_read_lock(lock);
}
EXPORT_SYMBOL(_read_lock);
@@ -74,7 +88,17 @@ unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock)
local_irq_save(flags);
preempt_disable();
+ spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
+ /*
+ * On lockdep we dont want the hand-coded irq-enable of
+ * _raw_spin_lock_flags() code, because lockdep assumes
+ * that interrupts are not re-enabled during lock-acquire:
+ */
+#ifdef CONFIG_PROVE_LOCKING
+ _raw_spin_lock(lock);
+#else
_raw_spin_lock_flags(lock, &flags);
+#endif
return flags;
}
EXPORT_SYMBOL(_spin_lock_irqsave);
@@ -83,6 +107,7 @@ void __lockfunc _spin_lock_irq(spinlock_t *lock)
{
local_irq_disable();
preempt_disable();
+ spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
_raw_spin_lock(lock);
}
EXPORT_SYMBOL(_spin_lock_irq);
@@ -91,6 +116,7 @@ void __lockfunc _spin_lock_bh(spinlock_t *lock)
{
local_bh_disable();
preempt_disable();
+ spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
_raw_spin_lock(lock);
}
EXPORT_SYMBOL(_spin_lock_bh);
@@ -101,6 +127,7 @@ unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock)
local_irq_save(flags);
preempt_disable();
+ rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
_raw_read_lock(lock);
return flags;
}
@@ -110,6 +137,7 @@ void __lockfunc _read_lock_irq(rwlock_t *lock)
{
local_irq_disable();
preempt_disable();
+ rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
_raw_read_lock(lock);
}
EXPORT_SYMBOL(_read_lock_irq);
@@ -118,6 +146,7 @@ void __lockfunc _read_lock_bh(rwlock_t *lock)
{
local_bh_disable();
preempt_disable();
+ rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
_raw_read_lock(lock);
}
EXPORT_SYMBOL(_read_lock_bh);
@@ -128,6 +157,7 @@ unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock)
local_irq_save(flags);
preempt_disable();
+ rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
_raw_write_lock(lock);
return flags;
}
@@ -137,6 +167,7 @@ void __lockfunc _write_lock_irq(rwlock_t *lock)
{
local_irq_disable();
preempt_disable();
+ rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
_raw_write_lock(lock);
}
EXPORT_SYMBOL(_write_lock_irq);
@@ -145,6 +176,7 @@ void __lockfunc _write_lock_bh(rwlock_t *lock)
{
local_bh_disable();
preempt_disable();
+ rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
_raw_write_lock(lock);
}
EXPORT_SYMBOL(_write_lock_bh);
@@ -152,6 +184,7 @@ EXPORT_SYMBOL(_write_lock_bh);
void __lockfunc _spin_lock(spinlock_t *lock)
{
preempt_disable();
+ spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
_raw_spin_lock(lock);
}
@@ -160,6 +193,7 @@ EXPORT_SYMBOL(_spin_lock);
void __lockfunc _write_lock(rwlock_t *lock)
{
preempt_disable();
+ rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
_raw_write_lock(lock);
}
@@ -255,8 +289,22 @@ BUILD_LOCK_OPS(write, rwlock);
#endif /* CONFIG_PREEMPT */
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+
+void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass)
+{
+ preempt_disable();
+ spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
+ _raw_spin_lock(lock);
+}
+
+EXPORT_SYMBOL(_spin_lock_nested);
+
+#endif
+
void __lockfunc _spin_unlock(spinlock_t *lock)
{
+ spin_release(&lock->dep_map, 1, _RET_IP_);
_raw_spin_unlock(lock);
preempt_enable();
}
@@ -264,6 +312,7 @@ EXPORT_SYMBOL(_spin_unlock);
void __lockfunc _write_unlock(rwlock_t *lock)
{
+ rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_write_unlock(lock);
preempt_enable();
}
@@ -271,6 +320,7 @@ EXPORT_SYMBOL(_write_unlock);
void __lockfunc _read_unlock(rwlock_t *lock)
{
+ rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_read_unlock(lock);
preempt_enable();
}
@@ -278,6 +328,7 @@ EXPORT_SYMBOL(_read_unlock);
void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
{
+ spin_release(&lock->dep_map, 1, _RET_IP_);
_raw_spin_unlock(lock);
local_irq_restore(flags);
preempt_enable();
@@ -286,6 +337,7 @@ EXPORT_SYMBOL(_spin_unlock_irqrestore);
void __lockfunc _spin_unlock_irq(spinlock_t *lock)
{
+ spin_release(&lock->dep_map, 1, _RET_IP_);
_raw_spin_unlock(lock);
local_irq_enable();
preempt_enable();
@@ -294,14 +346,16 @@ EXPORT_SYMBOL(_spin_unlock_irq);
void __lockfunc _spin_unlock_bh(spinlock_t *lock)
{
+ spin_release(&lock->dep_map, 1, _RET_IP_);
_raw_spin_unlock(lock);
preempt_enable_no_resched();
- local_bh_enable();
+ local_bh_enable_ip((unsigned long)__builtin_return_address(0));
}
EXPORT_SYMBOL(_spin_unlock_bh);
void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
{
+ rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_read_unlock(lock);
local_irq_restore(flags);
preempt_enable();
@@ -310,6 +364,7 @@ EXPORT_SYMBOL(_read_unlock_irqrestore);
void __lockfunc _read_unlock_irq(rwlock_t *lock)
{
+ rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_read_unlock(lock);
local_irq_enable();
preempt_enable();
@@ -318,14 +373,16 @@ EXPORT_SYMBOL(_read_unlock_irq);
void __lockfunc _read_unlock_bh(rwlock_t *lock)
{
+ rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_read_unlock(lock);
preempt_enable_no_resched();
- local_bh_enable();
+ local_bh_enable_ip((unsigned long)__builtin_return_address(0));
}
EXPORT_SYMBOL(_read_unlock_bh);
void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
{
+ rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_write_unlock(lock);
local_irq_restore(flags);
preempt_enable();
@@ -334,6 +391,7 @@ EXPORT_SYMBOL(_write_unlock_irqrestore);
void __lockfunc _write_unlock_irq(rwlock_t *lock)
{
+ rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_write_unlock(lock);
local_irq_enable();
preempt_enable();
@@ -342,9 +400,10 @@ EXPORT_SYMBOL(_write_unlock_irq);
void __lockfunc _write_unlock_bh(rwlock_t *lock)
{
+ rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_write_unlock(lock);
preempt_enable_no_resched();
- local_bh_enable();
+ local_bh_enable_ip((unsigned long)__builtin_return_address(0));
}
EXPORT_SYMBOL(_write_unlock_bh);
@@ -352,11 +411,13 @@ int __lockfunc _spin_trylock_bh(spinlock_t *lock)
{
local_bh_disable();
preempt_disable();
- if (_raw_spin_trylock(lock))
+ if (_raw_spin_trylock(lock)) {
+ spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
return 1;
+ }
preempt_enable_no_resched();
- local_bh_enable();
+ local_bh_enable_ip((unsigned long)__builtin_return_address(0));
return 0;
}
EXPORT_SYMBOL(_spin_trylock_bh);

Privacy Policy