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-rw-r--r--kernel/Makefile1
-rw-r--r--kernel/sched.c4
-rw-r--r--kernel/spinlock.c15
3 files changed, 14 insertions, 6 deletions
diff --git a/kernel/Makefile b/kernel/Makefile
index 8d57a2f1226..ff4dc02ce17 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -12,6 +12,7 @@ obj-y = sched.o fork.o exec_domain.o panic.o printk.o profile.o \
obj-$(CONFIG_FUTEX) += futex.o
obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
obj-$(CONFIG_SMP) += cpu.o spinlock.o
+obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o
obj-$(CONFIG_UID16) += uid16.o
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_KALLSYMS) += kallsyms.o
diff --git a/kernel/sched.c b/kernel/sched.c
index 2632b812cf2..15db82116e1 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1511,6 +1511,10 @@ static inline void finish_task_switch(runqueue_t *rq, task_t *prev)
* Manfred Spraul <manfred@colorfullife.com>
*/
prev_task_flags = prev->flags;
+#ifdef CONFIG_DEBUG_SPINLOCK
+ /* this is a valid case when another task releases the spinlock */
+ rq->lock.owner = current;
+#endif
finish_arch_switch(prev);
finish_lock_switch(rq, prev);
if (mm)
diff --git a/kernel/spinlock.c b/kernel/spinlock.c
index 0c3f9d8bbe1..0375fcd5921 100644
--- a/kernel/spinlock.c
+++ b/kernel/spinlock.c
@@ -3,7 +3,10 @@
*
* Author: Zwane Mwaikambo <zwane@fsmlabs.com>
*
- * Copyright (2004) Ingo Molnar
+ * Copyright (2004, 2005) Ingo Molnar
+ *
+ * This file contains the spinlock/rwlock implementations for the
+ * SMP and the DEBUG_SPINLOCK cases. (UP-nondebug inlines them)
*/
#include <linux/config.h>
@@ -17,12 +20,12 @@
* Generic declaration of the raw read_trylock() function,
* architectures are supposed to optimize this:
*/
-int __lockfunc generic_raw_read_trylock(rwlock_t *lock)
+int __lockfunc generic__raw_read_trylock(raw_rwlock_t *lock)
{
- _raw_read_lock(lock);
+ __raw_read_lock(lock);
return 1;
}
-EXPORT_SYMBOL(generic_raw_read_trylock);
+EXPORT_SYMBOL(generic__raw_read_trylock);
int __lockfunc _spin_trylock(spinlock_t *lock)
{
@@ -57,7 +60,7 @@ int __lockfunc _write_trylock(rwlock_t *lock)
}
EXPORT_SYMBOL(_write_trylock);
-#ifndef CONFIG_PREEMPT
+#if !defined(CONFIG_PREEMPT) || !defined(CONFIG_SMP)
void __lockfunc _read_lock(rwlock_t *lock)
{
@@ -72,7 +75,7 @@ unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock)
local_irq_save(flags);
preempt_disable();
- _raw_spin_lock_flags(lock, flags);
+ _raw_spin_lock_flags(lock, &flags);
return flags;
}
EXPORT_SYMBOL(_spin_lock_irqsave);