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Diffstat (limited to 'kernel/spinlock.c')
-rw-r--r--kernel/spinlock.c310
1 files changed, 153 insertions, 157 deletions
diff --git a/kernel/spinlock.c b/kernel/spinlock.c
index 5ddab730cb2..41e042219ff 100644
--- a/kernel/spinlock.c
+++ b/kernel/spinlock.c
@@ -21,145 +21,28 @@
#include <linux/debug_locks.h>
#include <linux/module.h>
-#ifndef _spin_trylock
-int __lockfunc _spin_trylock(spinlock_t *lock)
-{
- return __spin_trylock(lock);
-}
-EXPORT_SYMBOL(_spin_trylock);
-#endif
-
-#ifndef _read_trylock
-int __lockfunc _read_trylock(rwlock_t *lock)
-{
- return __read_trylock(lock);
-}
-EXPORT_SYMBOL(_read_trylock);
-#endif
-
-#ifndef _write_trylock
-int __lockfunc _write_trylock(rwlock_t *lock)
-{
- return __write_trylock(lock);
-}
-EXPORT_SYMBOL(_write_trylock);
-#endif
-
/*
* 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_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
-
-#ifndef _read_lock
-void __lockfunc _read_lock(rwlock_t *lock)
-{
- __read_lock(lock);
-}
-EXPORT_SYMBOL(_read_lock);
-#endif
-
-#ifndef _spin_lock_irqsave
-unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock)
-{
- return __spin_lock_irqsave(lock);
-}
-EXPORT_SYMBOL(_spin_lock_irqsave);
-#endif
-
-#ifndef _spin_lock_irq
-void __lockfunc _spin_lock_irq(spinlock_t *lock)
-{
- __spin_lock_irq(lock);
-}
-EXPORT_SYMBOL(_spin_lock_irq);
-#endif
-
-#ifndef _spin_lock_bh
-void __lockfunc _spin_lock_bh(spinlock_t *lock)
-{
- __spin_lock_bh(lock);
-}
-EXPORT_SYMBOL(_spin_lock_bh);
-#endif
-
-#ifndef _read_lock_irqsave
-unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock)
-{
- return __read_lock_irqsave(lock);
-}
-EXPORT_SYMBOL(_read_lock_irqsave);
-#endif
-
-#ifndef _read_lock_irq
-void __lockfunc _read_lock_irq(rwlock_t *lock)
-{
- __read_lock_irq(lock);
-}
-EXPORT_SYMBOL(_read_lock_irq);
-#endif
-
-#ifndef _read_lock_bh
-void __lockfunc _read_lock_bh(rwlock_t *lock)
-{
- __read_lock_bh(lock);
-}
-EXPORT_SYMBOL(_read_lock_bh);
-#endif
-
-#ifndef _write_lock_irqsave
-unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock)
-{
- return __write_lock_irqsave(lock);
-}
-EXPORT_SYMBOL(_write_lock_irqsave);
-#endif
-
-#ifndef _write_lock_irq
-void __lockfunc _write_lock_irq(rwlock_t *lock)
-{
- __write_lock_irq(lock);
-}
-EXPORT_SYMBOL(_write_lock_irq);
-#endif
-
-#ifndef _write_lock_bh
-void __lockfunc _write_lock_bh(rwlock_t *lock)
-{
- __write_lock_bh(lock);
-}
-EXPORT_SYMBOL(_write_lock_bh);
-#endif
-
-#ifndef _spin_lock
-void __lockfunc _spin_lock(spinlock_t *lock)
-{
- __spin_lock(lock);
-}
-EXPORT_SYMBOL(_spin_lock);
-#endif
-
-#ifndef _write_lock
-void __lockfunc _write_lock(rwlock_t *lock)
-{
- __write_lock(lock);
-}
-EXPORT_SYMBOL(_write_lock);
-#endif
-
-#else /* CONFIG_PREEMPT: */
-
/*
+ * The __lock_function inlines are taken from
+ * include/linux/spinlock_api_smp.h
+ */
+#else
+/*
+ * 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
+ * which embedds them into the calling _lock_function below.
+ *
* This could be a long-held lock. We both prepare to spin for a long
* time (making _this_ CPU preemptable if possible), and we also signal
* towards that other CPU that it should break the lock ASAP.
- *
- * (We do this in a function because inlining it would be excessive.)
*/
-
#define BUILD_LOCK_OPS(op, locktype) \
-void __lockfunc _##op##_lock(locktype##_t *lock) \
+void __lockfunc __##op##_lock(locktype##_t *lock) \
{ \
for (;;) { \
preempt_disable(); \
@@ -175,9 +58,7 @@ void __lockfunc _##op##_lock(locktype##_t *lock) \
(lock)->break_lock = 0; \
} \
\
-EXPORT_SYMBOL(_##op##_lock); \
- \
-unsigned long __lockfunc _##op##_lock_irqsave(locktype##_t *lock) \
+unsigned long __lockfunc __##op##_lock_irqsave(locktype##_t *lock) \
{ \
unsigned long flags; \
\
@@ -198,16 +79,12 @@ unsigned long __lockfunc _##op##_lock_irqsave(locktype##_t *lock) \
return flags; \
} \
\
-EXPORT_SYMBOL(_##op##_lock_irqsave); \
- \
-void __lockfunc _##op##_lock_irq(locktype##_t *lock) \
+void __lockfunc __##op##_lock_irq(locktype##_t *lock) \
{ \
_##op##_lock_irqsave(lock); \
} \
\
-EXPORT_SYMBOL(_##op##_lock_irq); \
- \
-void __lockfunc _##op##_lock_bh(locktype##_t *lock) \
+void __lockfunc __##op##_lock_bh(locktype##_t *lock) \
{ \
unsigned long flags; \
\
@@ -220,23 +97,21 @@ void __lockfunc _##op##_lock_bh(locktype##_t *lock) \
local_bh_disable(); \
local_irq_restore(flags); \
} \
- \
-EXPORT_SYMBOL(_##op##_lock_bh)
/*
* Build preemption-friendly versions of the following
* lock-spinning functions:
*
- * _[spin|read|write]_lock()
- * _[spin|read|write]_lock_irq()
- * _[spin|read|write]_lock_irqsave()
- * _[spin|read|write]_lock_bh()
+ * __[spin|read|write]_lock()
+ * __[spin|read|write]_lock_irq()
+ * __[spin|read|write]_lock_irqsave()
+ * __[spin|read|write]_lock_bh()
*/
BUILD_LOCK_OPS(spin, spinlock);
BUILD_LOCK_OPS(read, rwlock);
BUILD_LOCK_OPS(write, rwlock);
-#endif /* CONFIG_PREEMPT */
+#endif
#ifdef CONFIG_DEBUG_LOCK_ALLOC
@@ -248,7 +123,8 @@ 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, int subclass)
+unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock,
+ int subclass)
{
unsigned long flags;
@@ -272,7 +148,127 @@ EXPORT_SYMBOL(_spin_lock_nest_lock);
#endif
-#ifndef _spin_unlock
+#ifndef CONFIG_INLINE_SPIN_TRYLOCK
+int __lockfunc _spin_trylock(spinlock_t *lock)
+{
+ return __spin_trylock(lock);
+}
+EXPORT_SYMBOL(_spin_trylock);
+#endif
+
+#ifndef CONFIG_INLINE_READ_TRYLOCK
+int __lockfunc _read_trylock(rwlock_t *lock)
+{
+ return __read_trylock(lock);
+}
+EXPORT_SYMBOL(_read_trylock);
+#endif
+
+#ifndef CONFIG_INLINE_WRITE_TRYLOCK
+int __lockfunc _write_trylock(rwlock_t *lock)
+{
+ return __write_trylock(lock);
+}
+EXPORT_SYMBOL(_write_trylock);
+#endif
+
+#ifndef CONFIG_INLINE_READ_LOCK
+void __lockfunc _read_lock(rwlock_t *lock)
+{
+ __read_lock(lock);
+}
+EXPORT_SYMBOL(_read_lock);
+#endif
+
+#ifndef CONFIG_INLINE_SPIN_LOCK_IRQSAVE
+unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock)
+{
+ return __spin_lock_irqsave(lock);
+}
+EXPORT_SYMBOL(_spin_lock_irqsave);
+#endif
+
+#ifndef CONFIG_INLINE_SPIN_LOCK_IRQ
+void __lockfunc _spin_lock_irq(spinlock_t *lock)
+{
+ __spin_lock_irq(lock);
+}
+EXPORT_SYMBOL(_spin_lock_irq);
+#endif
+
+#ifndef CONFIG_INLINE_SPIN_LOCK_BH
+void __lockfunc _spin_lock_bh(spinlock_t *lock)
+{
+ __spin_lock_bh(lock);
+}
+EXPORT_SYMBOL(_spin_lock_bh);
+#endif
+
+#ifndef CONFIG_INLINE_READ_LOCK_IRQSAVE
+unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock)
+{
+ return __read_lock_irqsave(lock);
+}
+EXPORT_SYMBOL(_read_lock_irqsave);
+#endif
+
+#ifndef CONFIG_INLINE_READ_LOCK_IRQ
+void __lockfunc _read_lock_irq(rwlock_t *lock)
+{
+ __read_lock_irq(lock);
+}
+EXPORT_SYMBOL(_read_lock_irq);
+#endif
+
+#ifndef CONFIG_INLINE_READ_LOCK_BH
+void __lockfunc _read_lock_bh(rwlock_t *lock)
+{
+ __read_lock_bh(lock);
+}
+EXPORT_SYMBOL(_read_lock_bh);
+#endif
+
+#ifndef CONFIG_INLINE_WRITE_LOCK_IRQSAVE
+unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock)
+{
+ return __write_lock_irqsave(lock);
+}
+EXPORT_SYMBOL(_write_lock_irqsave);
+#endif
+
+#ifndef CONFIG_INLINE_WRITE_LOCK_IRQ
+void __lockfunc _write_lock_irq(rwlock_t *lock)
+{
+ __write_lock_irq(lock);
+}
+EXPORT_SYMBOL(_write_lock_irq);
+#endif
+
+#ifndef CONFIG_INLINE_WRITE_LOCK_BH
+void __lockfunc _write_lock_bh(rwlock_t *lock)
+{
+ __write_lock_bh(lock);
+}
+EXPORT_SYMBOL(_write_lock_bh);
+#endif
+
+#ifndef CONFIG_INLINE_SPIN_LOCK
+void __lockfunc _spin_lock(spinlock_t *lock)
+{
+ __spin_lock(lock);
+}
+EXPORT_SYMBOL(_spin_lock);
+#endif
+
+#ifndef CONFIG_INLINE_WRITE_LOCK
+void __lockfunc _write_lock(rwlock_t *lock)
+{
+ __write_lock(lock);
+}
+EXPORT_SYMBOL(_write_lock);
+#endif
+
+#ifndef CONFIG_INLINE_SPIN_UNLOCK
void __lockfunc _spin_unlock(spinlock_t *lock)
{
__spin_unlock(lock);
@@ -280,7 +276,7 @@ void __lockfunc _spin_unlock(spinlock_t *lock)
EXPORT_SYMBOL(_spin_unlock);
#endif
-#ifndef _write_unlock
+#ifndef CONFIG_INLINE_WRITE_UNLOCK
void __lockfunc _write_unlock(rwlock_t *lock)
{
__write_unlock(lock);
@@ -288,7 +284,7 @@ void __lockfunc _write_unlock(rwlock_t *lock)
EXPORT_SYMBOL(_write_unlock);
#endif
-#ifndef _read_unlock
+#ifndef CONFIG_INLINE_READ_UNLOCK
void __lockfunc _read_unlock(rwlock_t *lock)
{
__read_unlock(lock);
@@ -296,7 +292,7 @@ void __lockfunc _read_unlock(rwlock_t *lock)
EXPORT_SYMBOL(_read_unlock);
#endif
-#ifndef _spin_unlock_irqrestore
+#ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE
void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
{
__spin_unlock_irqrestore(lock, flags);
@@ -304,7 +300,7 @@ void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
EXPORT_SYMBOL(_spin_unlock_irqrestore);
#endif
-#ifndef _spin_unlock_irq
+#ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQ
void __lockfunc _spin_unlock_irq(spinlock_t *lock)
{
__spin_unlock_irq(lock);
@@ -312,7 +308,7 @@ void __lockfunc _spin_unlock_irq(spinlock_t *lock)
EXPORT_SYMBOL(_spin_unlock_irq);
#endif
-#ifndef _spin_unlock_bh
+#ifndef CONFIG_INLINE_SPIN_UNLOCK_BH
void __lockfunc _spin_unlock_bh(spinlock_t *lock)
{
__spin_unlock_bh(lock);
@@ -320,7 +316,7 @@ void __lockfunc _spin_unlock_bh(spinlock_t *lock)
EXPORT_SYMBOL(_spin_unlock_bh);
#endif
-#ifndef _read_unlock_irqrestore
+#ifndef CONFIG_INLINE_READ_UNLOCK_IRQRESTORE
void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
{
__read_unlock_irqrestore(lock, flags);
@@ -328,7 +324,7 @@ void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
EXPORT_SYMBOL(_read_unlock_irqrestore);
#endif
-#ifndef _read_unlock_irq
+#ifndef CONFIG_INLINE_READ_UNLOCK_IRQ
void __lockfunc _read_unlock_irq(rwlock_t *lock)
{
__read_unlock_irq(lock);
@@ -336,7 +332,7 @@ void __lockfunc _read_unlock_irq(rwlock_t *lock)
EXPORT_SYMBOL(_read_unlock_irq);
#endif
-#ifndef _read_unlock_bh
+#ifndef CONFIG_INLINE_READ_UNLOCK_BH
void __lockfunc _read_unlock_bh(rwlock_t *lock)
{
__read_unlock_bh(lock);
@@ -344,7 +340,7 @@ void __lockfunc _read_unlock_bh(rwlock_t *lock)
EXPORT_SYMBOL(_read_unlock_bh);
#endif
-#ifndef _write_unlock_irqrestore
+#ifndef CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE
void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
{
__write_unlock_irqrestore(lock, flags);
@@ -352,7 +348,7 @@ void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
EXPORT_SYMBOL(_write_unlock_irqrestore);
#endif
-#ifndef _write_unlock_irq
+#ifndef CONFIG_INLINE_WRITE_UNLOCK_IRQ
void __lockfunc _write_unlock_irq(rwlock_t *lock)
{
__write_unlock_irq(lock);
@@ -360,7 +356,7 @@ void __lockfunc _write_unlock_irq(rwlock_t *lock)
EXPORT_SYMBOL(_write_unlock_irq);
#endif
-#ifndef _write_unlock_bh
+#ifndef CONFIG_INLINE_WRITE_UNLOCK_BH
void __lockfunc _write_unlock_bh(rwlock_t *lock)
{
__write_unlock_bh(lock);
@@ -368,7 +364,7 @@ void __lockfunc _write_unlock_bh(rwlock_t *lock)
EXPORT_SYMBOL(_write_unlock_bh);
#endif
-#ifndef _spin_trylock_bh
+#ifndef CONFIG_INLINE_SPIN_TRYLOCK_BH
int __lockfunc _spin_trylock_bh(spinlock_t *lock)
{
return __spin_trylock_bh(lock);