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/*
* Copyright ( 2004 ) Linus Torvalds
*
* Author : Zwane Mwaikambo < zwane @ fsmlabs . com >
*
[PATCH] spinlock consolidation
This patch (written by me and also containing many suggestions of Arjan van
de Ven) does a major cleanup of the spinlock code. It does the following
things:
- consolidates and enhances the spinlock/rwlock debugging code
- simplifies the asm/spinlock.h files
- encapsulates the raw spinlock type and moves generic spinlock
features (such as ->break_lock) into the generic code.
- cleans up the spinlock code hierarchy to get rid of the spaghetti.
Most notably there's now only a single variant of the debugging code,
located in lib/spinlock_debug.c. (previously we had one SMP debugging
variant per architecture, plus a separate generic one for UP builds)
Also, i've enhanced the rwlock debugging facility, it will now track
write-owners. There is new spinlock-owner/CPU-tracking on SMP builds too.
All locks have lockup detection now, which will work for both soft and hard
spin/rwlock lockups.
The arch-level include files now only contain the minimally necessary
subset of the spinlock code - all the rest that can be generalized now
lives in the generic headers:
include/asm-i386/spinlock_types.h | 16
include/asm-x86_64/spinlock_types.h | 16
I have also split up the various spinlock variants into separate files,
making it easier to see which does what. The new layout is:
SMP | UP
----------------------------|-----------------------------------
asm/spinlock_types_smp.h | linux/spinlock_types_up.h
linux/spinlock_types.h | linux/spinlock_types.h
asm/spinlock_smp.h | linux/spinlock_up.h
linux/spinlock_api_smp.h | linux/spinlock_api_up.h
linux/spinlock.h | linux/spinlock.h
/*
* here's the role of the various spinlock/rwlock related include files:
*
* on SMP builds:
*
* asm/spinlock_types.h: contains the raw_spinlock_t/raw_rwlock_t and the
* initializers
*
* linux/spinlock_types.h:
* defines the generic type and initializers
*
* asm/spinlock.h: contains the __raw_spin_*()/etc. lowlevel
* implementations, mostly inline assembly code
*
* (also included on UP-debug builds:)
*
* linux/spinlock_api_smp.h:
* contains the prototypes for the _spin_*() APIs.
*
* linux/spinlock.h: builds the final spin_*() APIs.
*
* on UP builds:
*
* linux/spinlock_type_up.h:
* contains the generic, simplified UP spinlock type.
* (which is an empty structure on non-debug builds)
*
* linux/spinlock_types.h:
* defines the generic type and initializers
*
* linux/spinlock_up.h:
* contains the __raw_spin_*()/etc. version of UP
* builds. (which are NOPs on non-debug, non-preempt
* builds)
*
* (included on UP-non-debug builds:)
*
* linux/spinlock_api_up.h:
* builds the _spin_*() APIs.
*
* linux/spinlock.h: builds the final spin_*() APIs.
*/
All SMP and UP architectures are converted by this patch.
arm, i386, ia64, ppc, ppc64, s390/s390x, x64 was build-tested via
crosscompilers. m32r, mips, sh, sparc, have not been tested yet, but should
be mostly fine.
From: Grant Grundler <grundler@parisc-linux.org>
Booted and lightly tested on a500-44 (64-bit, SMP kernel, dual CPU).
Builds 32-bit SMP kernel (not booted or tested). I did not try to build
non-SMP kernels. That should be trivial to fix up later if necessary.
I converted bit ops atomic_hash lock to raw_spinlock_t. Doing so avoids
some ugly nesting of linux/*.h and asm/*.h files. Those particular locks
are well tested and contained entirely inside arch specific code. I do NOT
expect any new issues to arise with them.
If someone does ever need to use debug/metrics with them, then they will
need to unravel this hairball between spinlocks, atomic ops, and bit ops
that exist only because parisc has exactly one atomic instruction: LDCW
(load and clear word).
From: "Luck, Tony" <tony.luck@intel.com>
ia64 fix
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjanv@infradead.org>
Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
Cc: Matthew Wilcox <willy@debian.org>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Mikael Pettersson <mikpe@csd.uu.se>
Signed-off-by: Benoit Boissinot <benoit.boissinot@ens-lyon.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-10 11:25:56 +04:00
* Copyright ( 2004 , 2005 ) Ingo Molnar
*
* This file contains the spinlock / rwlock implementations for the
* SMP and the DEBUG_SPINLOCK cases . ( UP - nondebug inlines them )
2006-09-26 12:52:28 +04:00
*
* Note that some architectures have special knowledge about the
* stack frames of these functions in their profile_pc . If you
* change anything significant here that could change the stack
* frame contact the architecture maintainers .
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*/
# include <linux/linkage.h>
# include <linux/preempt.h>
# include <linux/spinlock.h>
# include <linux/interrupt.h>
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# include <linux/debug_locks.h>
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# include <linux/module.h>
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/*
* 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)
/*
* 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 .
*/
# define BUILD_LOCK_OPS(op, locktype) \
void __lockfunc __ # # op # # _lock ( locktype # # _t * lock ) \
{ \
for ( ; ; ) { \
preempt_disable ( ) ; \
if ( likely ( _raw_ # # op # # _trylock ( lock ) ) ) \
break ; \
preempt_enable ( ) ; \
\
if ( ! ( lock ) - > break_lock ) \
( lock ) - > break_lock = 1 ; \
while ( ! op # # _can_lock ( lock ) & & ( lock ) - > break_lock ) \
_raw_ # # op # # _relax ( & lock - > raw_lock ) ; \
} \
( lock ) - > break_lock = 0 ; \
} \
\
unsigned long __lockfunc __ # # op # # _lock_irqsave ( locktype # # _t * lock ) \
{ \
unsigned long flags ; \
\
for ( ; ; ) { \
preempt_disable ( ) ; \
local_irq_save ( flags ) ; \
if ( likely ( _raw_ # # op # # _trylock ( lock ) ) ) \
break ; \
local_irq_restore ( flags ) ; \
preempt_enable ( ) ; \
\
if ( ! ( lock ) - > break_lock ) \
( lock ) - > break_lock = 1 ; \
while ( ! op # # _can_lock ( lock ) & & ( lock ) - > break_lock ) \
_raw_ # # op # # _relax ( & lock - > raw_lock ) ; \
} \
( lock ) - > break_lock = 0 ; \
return flags ; \
} \
\
void __lockfunc __ # # op # # _lock_irq ( locktype # # _t * lock ) \
{ \
_ # # op # # _lock_irqsave ( lock ) ; \
} \
\
void __lockfunc __ # # op # # _lock_bh ( locktype # # _t * lock ) \
{ \
unsigned long flags ; \
\
/* */ \
/* Careful: we must exclude softirqs too, hence the */ \
/* irq-disabling. We use the generic preemption-aware */ \
/* function: */ \
/**/ \
flags = _ # # op # # _lock_irqsave ( lock ) ; \
local_bh_disable ( ) ; \
local_irq_restore ( flags ) ; \
} \
/*
* 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 ( )
*/
BUILD_LOCK_OPS ( spin , spinlock ) ;
BUILD_LOCK_OPS ( read , rwlock ) ;
BUILD_LOCK_OPS ( write , rwlock ) ;
# endif
# 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_ ) ;
LOCK_CONTENDED ( lock , _raw_spin_trylock , _raw_spin_lock ) ;
}
EXPORT_SYMBOL ( _spin_lock_nested ) ;
unsigned long __lockfunc _spin_lock_irqsave_nested ( spinlock_t * lock ,
int subclass )
{
unsigned long flags ;
local_irq_save ( flags ) ;
preempt_disable ( ) ;
spin_acquire ( & lock - > dep_map , subclass , 0 , _RET_IP_ ) ;
LOCK_CONTENDED_FLAGS ( lock , _raw_spin_trylock , _raw_spin_lock ,
_raw_spin_lock_flags , & flags ) ;
return flags ;
}
EXPORT_SYMBOL ( _spin_lock_irqsave_nested ) ;
void __lockfunc _spin_lock_nest_lock ( spinlock_t * lock ,
struct lockdep_map * nest_lock )
{
preempt_disable ( ) ;
spin_acquire_nest ( & lock - > dep_map , 0 , 0 , nest_lock , _RET_IP_ ) ;
LOCK_CONTENDED ( lock , _raw_spin_trylock , _raw_spin_lock ) ;
}
EXPORT_SYMBOL ( _spin_lock_nest_lock ) ;
# endif
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# ifndef CONFIG_INLINE_SPIN_TRYLOCK
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int __lockfunc _spin_trylock ( spinlock_t * lock )
{
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return __spin_trylock ( lock ) ;
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}
EXPORT_SYMBOL ( _spin_trylock ) ;
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# endif
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# ifndef CONFIG_INLINE_READ_TRYLOCK
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int __lockfunc _read_trylock ( rwlock_t * lock )
{
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return __read_trylock ( lock ) ;
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}
EXPORT_SYMBOL ( _read_trylock ) ;
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# endif
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# ifndef CONFIG_INLINE_WRITE_TRYLOCK
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int __lockfunc _write_trylock ( rwlock_t * lock )
{
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return __write_trylock ( lock ) ;
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}
EXPORT_SYMBOL ( _write_trylock ) ;
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# endif
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# ifndef CONFIG_INLINE_READ_LOCK
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void __lockfunc _read_lock ( rwlock_t * lock )
{
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__read_lock ( lock ) ;
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}
EXPORT_SYMBOL ( _read_lock ) ;
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# endif
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# ifndef CONFIG_INLINE_SPIN_LOCK_IRQSAVE
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unsigned long __lockfunc _spin_lock_irqsave ( spinlock_t * lock )
{
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return __spin_lock_irqsave ( lock ) ;
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}
EXPORT_SYMBOL ( _spin_lock_irqsave ) ;
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# endif
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# ifndef CONFIG_INLINE_SPIN_LOCK_IRQ
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void __lockfunc _spin_lock_irq ( spinlock_t * lock )
{
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__spin_lock_irq ( lock ) ;
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}
EXPORT_SYMBOL ( _spin_lock_irq ) ;
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# endif
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# ifndef CONFIG_INLINE_SPIN_LOCK_BH
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void __lockfunc _spin_lock_bh ( spinlock_t * lock )
{
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__spin_lock_bh ( lock ) ;
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}
EXPORT_SYMBOL ( _spin_lock_bh ) ;
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# endif
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# ifndef CONFIG_INLINE_READ_LOCK_IRQSAVE
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unsigned long __lockfunc _read_lock_irqsave ( rwlock_t * lock )
{
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return __read_lock_irqsave ( lock ) ;
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}
EXPORT_SYMBOL ( _read_lock_irqsave ) ;
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# endif
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# ifndef CONFIG_INLINE_READ_LOCK_IRQ
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void __lockfunc _read_lock_irq ( rwlock_t * lock )
{
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__read_lock_irq ( lock ) ;
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}
EXPORT_SYMBOL ( _read_lock_irq ) ;
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# endif
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# ifndef CONFIG_INLINE_READ_LOCK_BH
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void __lockfunc _read_lock_bh ( rwlock_t * lock )
{
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__read_lock_bh ( lock ) ;
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}
EXPORT_SYMBOL ( _read_lock_bh ) ;
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# endif
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# ifndef CONFIG_INLINE_WRITE_LOCK_IRQSAVE
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unsigned long __lockfunc _write_lock_irqsave ( rwlock_t * lock )
{
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return __write_lock_irqsave ( lock ) ;
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}
EXPORT_SYMBOL ( _write_lock_irqsave ) ;
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# endif
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# ifndef CONFIG_INLINE_WRITE_LOCK_IRQ
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void __lockfunc _write_lock_irq ( rwlock_t * lock )
{
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__write_lock_irq ( lock ) ;
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}
EXPORT_SYMBOL ( _write_lock_irq ) ;
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# endif
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# ifndef CONFIG_INLINE_WRITE_LOCK_BH
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void __lockfunc _write_lock_bh ( rwlock_t * lock )
{
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__write_lock_bh ( lock ) ;
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}
EXPORT_SYMBOL ( _write_lock_bh ) ;
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# endif
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# ifndef CONFIG_INLINE_SPIN_LOCK
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void __lockfunc _spin_lock ( spinlock_t * lock )
{
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__spin_lock ( lock ) ;
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}
EXPORT_SYMBOL ( _spin_lock ) ;
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# endif
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# ifndef CONFIG_INLINE_WRITE_LOCK
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void __lockfunc _write_lock ( rwlock_t * lock )
{
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__write_lock ( lock ) ;
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}
EXPORT_SYMBOL ( _write_lock ) ;
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# endif
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# ifndef CONFIG_INLINE_SPIN_UNLOCK
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void __lockfunc _spin_unlock ( spinlock_t * lock )
{
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__spin_unlock ( lock ) ;
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}
EXPORT_SYMBOL ( _spin_unlock ) ;
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# endif
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# ifndef CONFIG_INLINE_WRITE_UNLOCK
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void __lockfunc _write_unlock ( rwlock_t * lock )
{
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__write_unlock ( lock ) ;
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}
EXPORT_SYMBOL ( _write_unlock ) ;
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# endif
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# ifndef CONFIG_INLINE_READ_UNLOCK
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void __lockfunc _read_unlock ( rwlock_t * lock )
{
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__read_unlock ( lock ) ;
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}
EXPORT_SYMBOL ( _read_unlock ) ;
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# endif
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# ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE
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void __lockfunc _spin_unlock_irqrestore ( spinlock_t * lock , unsigned long flags )
{
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__spin_unlock_irqrestore ( lock , flags ) ;
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}
EXPORT_SYMBOL ( _spin_unlock_irqrestore ) ;
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# endif
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# ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQ
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void __lockfunc _spin_unlock_irq ( spinlock_t * lock )
{
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__spin_unlock_irq ( lock ) ;
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}
EXPORT_SYMBOL ( _spin_unlock_irq ) ;
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# endif
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# ifndef CONFIG_INLINE_SPIN_UNLOCK_BH
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void __lockfunc _spin_unlock_bh ( spinlock_t * lock )
{
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__spin_unlock_bh ( lock ) ;
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}
EXPORT_SYMBOL ( _spin_unlock_bh ) ;
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# endif
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# ifndef CONFIG_INLINE_READ_UNLOCK_IRQRESTORE
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void __lockfunc _read_unlock_irqrestore ( rwlock_t * lock , unsigned long flags )
{
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__read_unlock_irqrestore ( lock , flags ) ;
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}
EXPORT_SYMBOL ( _read_unlock_irqrestore ) ;
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# endif
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# ifndef CONFIG_INLINE_READ_UNLOCK_IRQ
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void __lockfunc _read_unlock_irq ( rwlock_t * lock )
{
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__read_unlock_irq ( lock ) ;
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}
EXPORT_SYMBOL ( _read_unlock_irq ) ;
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# endif
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# ifndef CONFIG_INLINE_READ_UNLOCK_BH
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void __lockfunc _read_unlock_bh ( rwlock_t * lock )
{
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__read_unlock_bh ( lock ) ;
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}
EXPORT_SYMBOL ( _read_unlock_bh ) ;
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# endif
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# ifndef CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE
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void __lockfunc _write_unlock_irqrestore ( rwlock_t * lock , unsigned long flags )
{
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__write_unlock_irqrestore ( lock , flags ) ;
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}
EXPORT_SYMBOL ( _write_unlock_irqrestore ) ;
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# endif
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# ifndef CONFIG_INLINE_WRITE_UNLOCK_IRQ
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void __lockfunc _write_unlock_irq ( rwlock_t * lock )
{
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__write_unlock_irq ( lock ) ;
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}
EXPORT_SYMBOL ( _write_unlock_irq ) ;
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# endif
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# ifndef CONFIG_INLINE_WRITE_UNLOCK_BH
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void __lockfunc _write_unlock_bh ( rwlock_t * lock )
{
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__write_unlock_bh ( lock ) ;
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}
EXPORT_SYMBOL ( _write_unlock_bh ) ;
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# endif
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# ifndef CONFIG_INLINE_SPIN_TRYLOCK_BH
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int __lockfunc _spin_trylock_bh ( spinlock_t * lock )
{
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return __spin_trylock_bh ( lock ) ;
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}
EXPORT_SYMBOL ( _spin_trylock_bh ) ;
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# endif
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notrace int in_lock_functions ( unsigned long addr )
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{
/* Linker adds these: start and end of __lockfunc functions */
extern char __lock_text_start [ ] , __lock_text_end [ ] ;
return addr > = ( unsigned long ) __lock_text_start
& & addr < ( unsigned long ) __lock_text_end ;
}
EXPORT_SYMBOL ( in_lock_functions ) ;