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locking: Allow arch-inlined spinlocks

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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 __always_inline__spin_lock

needs to be added to arch/<...>/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@de.ibm.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Horst Hartmann <horsth@linux.vnet.ibm.com>
Cc: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: David Miller <davem@davemloft.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: <linux-arch@vger.kernel.org>
LKML-Reference: <20090831124418.375299024@de.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Heiko Carstens 2009-08-31 14:43:37 +02:00 committed by Ingo Molnar
parent 69d0ee7377
commit 892a7c67c1
2 changed files with 175 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

119
include/linux/spinlock_api_smp.h
View file

@ -60,6 +60,125 @@ void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
__releases(lock);
#ifndef CONFIG_DEBUG_SPINLOCK
#ifndef CONFIG_GENERIC_LOCKBREAK
#ifdef __always_inline__spin_lock
#define _spin_lock(lock) __spin_lock(lock)
#endif
#ifdef __always_inline__read_lock
#define _read_lock(lock) __read_lock(lock)
#endif
#ifdef __always_inline__write_lock
#define _write_lock(lock) __write_lock(lock)
#endif
#ifdef __always_inline__spin_lock_bh
#define _spin_lock_bh(lock) __spin_lock_bh(lock)
#endif
#ifdef __always_inline__read_lock_bh
#define _read_lock_bh(lock) __read_lock_bh(lock)
#endif
#ifdef __always_inline__write_lock_bh
#define _write_lock_bh(lock) __write_lock_bh(lock)
#endif
#ifdef __always_inline__spin_lock_irq
#define _spin_lock_irq(lock) __spin_lock_irq(lock)
#endif
#ifdef __always_inline__read_lock_irq
#define _read_lock_irq(lock) __read_lock_irq(lock)
#endif
#ifdef __always_inline__write_lock_irq
#define _write_lock_irq(lock) __write_lock_irq(lock)
#endif
#ifdef __always_inline__spin_lock_irqsave
#define _spin_lock_irqsave(lock) __spin_lock_irqsave(lock)
#endif
#ifdef __always_inline__read_lock_irqsave
#define _read_lock_irqsave(lock) __read_lock_irqsave(lock)
#endif
#ifdef __always_inline__write_lock_irqsave
#define _write_lock_irqsave(lock) __write_lock_irqsave(lock)
#endif
#endif /* !CONFIG_GENERIC_LOCKBREAK */
#ifdef __always_inline__spin_trylock
#define _spin_trylock(lock) __spin_trylock(lock)
#endif
#ifdef __always_inline__read_trylock
#define _read_trylock(lock) __read_trylock(lock)
#endif
#ifdef __always_inline__write_trylock
#define _write_trylock(lock) __write_trylock(lock)
#endif
#ifdef __always_inline__spin_trylock_bh
#define _spin_trylock_bh(lock) __spin_trylock_bh(lock)
#endif
#ifdef __always_inline__spin_unlock
#define _spin_unlock(lock) __spin_unlock(lock)
#endif
#ifdef __always_inline__read_unlock
#define _read_unlock(lock) __read_unlock(lock)
#endif
#ifdef __always_inline__write_unlock
#define _write_unlock(lock) __write_unlock(lock)
#endif
#ifdef __always_inline__spin_unlock_bh
#define _spin_unlock_bh(lock) __spin_unlock_bh(lock)
#endif
#ifdef __always_inline__read_unlock_bh
#define _read_unlock_bh(lock) __read_unlock_bh(lock)
#endif
#ifdef __always_inline__write_unlock_bh
#define _write_unlock_bh(lock) __write_unlock_bh(lock)
#endif
#ifdef __always_inline__spin_unlock_irq
#define _spin_unlock_irq(lock) __spin_unlock_irq(lock)
#endif
#ifdef __always_inline__read_unlock_irq
#define _read_unlock_irq(lock) __read_unlock_irq(lock)
#endif
#ifdef __always_inline__write_unlock_irq
#define _write_unlock_irq(lock) __write_unlock_irq(lock)
#endif
#ifdef __always_inline__spin_unlock_irqrestore
#define _spin_unlock_irqrestore(lock, flags) __spin_unlock_irqrestore(lock, flags)
#endif
#ifdef __always_inline__read_unlock_irqrestore
#define _read_unlock_irqrestore(lock, flags) __read_unlock_irqrestore(lock, flags)
#endif
#ifdef __always_inline__write_unlock_irqrestore
#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();

56
kernel/spinlock.c
View file

@ -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)
{