From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
This allows an architecture to specify per lock variant if the
locking code should be kept out-of-line or inlined.
If an architecure wants out-of-line locking code no change is
needed. To force inlining of e.g. spin_lock() the line
#define __spin_lock_is_small
needs to be added to arch/<whatever>/include/asm/spinlock.h
If CONFIG_DEBUG_SPINLOCK or CONFIG_GENERIC_LOCKBREAK are defined the
per architecture defines are (partly) ignored and still out-of-line
spinlock code will be generated.
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
---
include/linux/spinlock_api_smp.h | 119 +++++++++++++++++++++++++++++++++++++++
kernel/spinlock.c | 56 ++++++++++++++++++
2 files changed, 175 insertions(+)
Index: linux-2.6/kernel/spinlock.c
===================================================================
--- linux-2.6.orig/kernel/spinlock.c
+++ linux-2.6/kernel/spinlock.c
@@ -21,23 +21,29 @@
#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
@@ -46,77 +52,101 @@ EXPORT_SYMBOL(_write_trylock);
*/
#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: */
@@ -242,83 +272,109 @@ EXPORT_SYMBOL(_spin_lock_nest_lock);
#endif
+#ifndef _spin_unlock
void __lockfunc _spin_unlock(spinlock_t *lock)
{
__spin_unlock(lock);
}
EXPORT_SYMBOL(_spin_unlock);
+#endif
+#ifndef _write_unlock
void __lockfunc _write_unlock(rwlock_t *lock)
{
__write_unlock(lock);
}
EXPORT_SYMBOL(_write_unlock);
+#endif
+#ifndef _read_unlock
void __lockfunc _read_unlock(rwlock_t *lock)
{
__read_unlock(lock);
}
EXPORT_SYMBOL(_read_unlock);
+#endif
+#ifndef _spin_unlock_irqrestore
void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
{
__spin_unlock_irqrestore(lock, flags);
}
EXPORT_SYMBOL(_spin_unlock_irqrestore);
+#endif
+#ifndef _spin_unlock_irq
void __lockfunc _spin_unlock_irq(spinlock_t *lock)
{
__spin_unlock_irq(lock);
}
EXPORT_SYMBOL(_spin_unlock_irq);
+#endif
+#ifndef _spin_unlock_bh
void __lockfunc _spin_unlock_bh(spinlock_t *lock)
{
__spin_unlock_bh(lock);
}
EXPORT_SYMBOL(_spin_unlock_bh);
+#endif
+#ifndef _read_unlock_irqrestore
void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
{
__read_unlock_irqrestore(lock, flags);
}
EXPORT_SYMBOL(_read_unlock_irqrestore);
+#endif
+#ifndef _read_unlock_irq
void __lockfunc _read_unlock_irq(rwlock_t *lock)
{
__read_unlock_irq(lock);
}
EXPORT_SYMBOL(_read_unlock_irq);
+#endif
+#ifndef _read_unlock_bh
void __lockfunc _read_unlock_bh(rwlock_t *lock)
{
__read_unlock_bh(lock);
}
EXPORT_SYMBOL(_read_unlock_bh);
+#endif
+#ifndef _write_unlock_irqrestore
void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
{
__write_unlock_irqrestore(lock, flags);
}
EXPORT_SYMBOL(_write_unlock_irqrestore);
+#endif
+#ifndef _write_unlock_irq
void __lockfunc _write_unlock_irq(rwlock_t *lock)
{
__write_unlock_irq(lock);
}
EXPORT_SYMBOL(_write_unlock_irq);
+#endif
+#ifndef _write_unlock_bh
void __lockfunc _write_unlock_bh(rwlock_t *lock)
{
__write_unlock_bh(lock);
}
EXPORT_SYMBOL(_write_unlock_bh);
+#endif
+#ifndef _spin_trylock_bh
int __lockfunc _spin_trylock_bh(spinlock_t *lock)
{
return __spin_trylock_bh(lock);
}
EXPORT_SYMBOL(_spin_trylock_bh);
+#endif
notrace int in_lock_functions(unsigned long addr)
{
Index: linux-2.6/include/linux/spinlock_api_smp.h
===================================================================
--- linux-2.6.orig/include/linux/spinlock_api_smp.h
+++ linux-2.6/include/linux/spinlock_api_smp.h
@@ -60,6 +60,125 @@ void __lockfunc _read_unlock_irqrestore(
void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
__releases(lock);
+#ifndef CONFIG_DEBUG_SPINLOCK
+#ifndef CONFIG_GENERIC_LOCKBREAK
+
+#ifdef __spin_lock_is_small
+#define _spin_lock(lock) __spin_lock(lock)
+#endif
+
+#ifdef __read_lock_is_small
+#define _read_lock(lock) __read_lock(lock)
+#endif
+
+#ifdef __write_lock_is_small
+#define _write_lock(lock) __write_lock(lock)
+#endif
+
+#ifdef __spin_lock_bh_is_small
+#define _spin_lock_bh(lock) __spin_lock_bh(lock)
+#endif
+
+#ifdef __read_lock_bh_is_small
+#define _read_lock_bh(lock) __read_lock_bh(lock)
+#endif
+
+#ifdef __write_lock_bh_is_small
+#define _write_lock_bh(lock) __write_lock_bh(lock)
+#endif
+
+#ifdef __spin_lock_irq_is_small
+#define _spin_lock_irq(lock) __spin_lock_irq(lock)
+#endif
+
+#ifdef __read_lock_irq_is_small
+#define _read_lock_irq(lock) __read_lock_irq(lock)
+#endif
+
+#ifdef __write_lock_irq_is_small
+#define _write_lock_irq(lock) __write_lock_irq(lock)
+#endif
+
+#ifdef __spin_lock_irqsave_is_small
+#define _spin_lock_irqsave(lock) __spin_lock_irqsave(lock)
+#endif
+
+#ifdef __read_lock_irqsave_is_small
+#define _read_lock_irqsave(lock) __read_lock_irqsave(lock)
+#endif
+
+#ifdef __write_lock_irqsave_is_small
+#define _write_lock_irqsave(lock) __write_lock_irqsave(lock)
+#endif
+
+#endif /* !CONFIG_GENERIC_LOCKBREAK */
+
+#ifdef __spin_trylock_is_small
+#define _spin_trylock(lock) __spin_trylock(lock)
+#endif
+
+#ifdef __read_trylock_is_small
+#define _read_trylock(lock) __read_trylock(lock)
+#endif
+
+#ifdef __write_trylock_is_small
+#define _write_trylock(lock) __write_trylock(lock)
+#endif
+
+#ifdef __spin_trylock_bh_is_small
+#define _spin_trylock_bh(lock) __spin_trylock_bh(lock)
+#endif
+
+#ifdef __spin_unlock_is_small
+#define _spin_unlock(lock) __spin_unlock(lock)
+#endif
+
+#ifdef __read_unlock_is_small
+#define _read_unlock(lock) __read_unlock(lock)
+#endif
+
+#ifdef __write_unlock_is_small
+#define _write_unlock(lock) __write_unlock(lock)
+#endif
+
+#ifdef __spin_unlock_bh_is_small
+#define _spin_unlock_bh(lock) __spin_unlock_bh(lock)
+#endif
+
+#ifdef __read_unlock_bh_is_small
+#define _read_unlock_bh(lock) __read_unlock_bh(lock)
+#endif
+
+#ifdef __write_unlock_bh_is_small
+#define _write_unlock_bh(lock) __write_unlock_bh(lock)
+#endif
+
+#ifdef __spin_unlock_irq_is_small
+#define _spin_unlock_irq(lock) __spin_unlock_irq(lock)
+#endif
+
+#ifdef __read_unlock_irq_is_small
+#define _read_unlock_irq(lock) __read_unlock_irq(lock)
+#endif
+
+#ifdef __write_unlock_irq_is_small
+#define _write_unlock_irq(lock) __write_unlock_irq(lock)
+#endif
+
+#ifdef __spin_unlock_irqrestore_is_small
+#define _spin_unlock_irqrestore(lock, flags) __spin_unlock_irqrestore(lock, flags)
+#endif
+
+#ifdef __read_unlock_irqrestore_is_small
+#define _read_unlock_irqrestore(lock, flags) __read_unlock_irqrestore(lock, flags)
+#endif
+
+#ifdef __write_unlock_irqrestore_is_small
+#define _write_unlock_irqrestore(lock, flags) __write_unlock_irqrestore(lock, flags)
+#endif
+
+#endif /* CONFIG_DEBUG_SPINLOCK */
+
static inline int __spin_trylock(spinlock_t *lock)
{
preempt_disable();
--
--
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