[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 15:25:56 +08:00
|
|
|
#ifndef __LINUX_SPINLOCK_API_SMP_H
|
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#define __LINUX_SPINLOCK_API_SMP_H
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#ifndef __LINUX_SPINLOCK_H
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# error "please don't include this file directly"
|
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#endif
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/*
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* include/linux/spinlock_api_smp.h
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*
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* spinlock API declarations on SMP (and debug)
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* (implemented in kernel/spinlock.c)
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*
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* portions Copyright 2005, Red Hat, Inc., Ingo Molnar
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* Released under the General Public License (GPL).
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*/
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int in_lock_functions(unsigned long addr);
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2009-12-03 03:02:59 +08:00
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|
#define assert_raw_spin_locked(x) BUG_ON(!raw_spin_is_locked(x))
|
[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 15:25:56 +08:00
|
|
|
|
2009-12-04 04:52:18 +08:00
|
|
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void __lockfunc _raw_spin_lock(raw_spinlock_t *lock) __acquires(lock);
|
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void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass)
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__acquires(lock);
|
2009-12-03 03:02:59 +08:00
|
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void __lockfunc
|
2009-12-04 04:52:18 +08:00
|
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_raw_spin_lock_nest_lock(raw_spinlock_t *lock, struct lockdep_map *map)
|
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__acquires(lock);
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void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock) __acquires(lock);
|
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void __lockfunc _raw_spin_lock_irq(raw_spinlock_t *lock)
|
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__acquires(lock);
|
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|
|
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unsigned long __lockfunc _raw_spin_lock_irqsave(raw_spinlock_t *lock)
|
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|
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__acquires(lock);
|
2009-12-03 03:02:59 +08:00
|
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unsigned long __lockfunc
|
2009-12-04 04:52:18 +08:00
|
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_raw_spin_lock_irqsave_nested(raw_spinlock_t *lock, int subclass)
|
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__acquires(lock);
|
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|
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int __lockfunc _raw_spin_trylock(raw_spinlock_t *lock);
|
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int __lockfunc _raw_spin_trylock_bh(raw_spinlock_t *lock);
|
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void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock) __releases(lock);
|
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void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock) __releases(lock);
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void __lockfunc _raw_spin_unlock_irq(raw_spinlock_t *lock) __releases(lock);
|
2009-12-03 03:02:59 +08:00
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void __lockfunc
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2009-12-04 04:52:18 +08:00
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_raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags)
|
|
|
|
__releases(lock);
|
[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 15:25:56 +08:00
|
|
|
|
2009-11-09 23:21:34 +08:00
|
|
|
#ifdef CONFIG_INLINE_SPIN_LOCK
|
2009-12-04 04:52:18 +08:00
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#define _raw_spin_lock(lock) __raw_spin_lock(lock)
|
2009-08-31 20:43:37 +08:00
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|
#endif
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|
2009-11-09 23:21:34 +08:00
|
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#ifdef CONFIG_INLINE_SPIN_LOCK_BH
|
2009-12-04 04:52:18 +08:00
|
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#define _raw_spin_lock_bh(lock) __raw_spin_lock_bh(lock)
|
2009-08-31 20:43:37 +08:00
|
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|
#endif
|
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|
2009-11-09 23:21:34 +08:00
|
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|
#ifdef CONFIG_INLINE_SPIN_LOCK_IRQ
|
2009-12-04 04:52:18 +08:00
|
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#define _raw_spin_lock_irq(lock) __raw_spin_lock_irq(lock)
|
2009-08-31 20:43:37 +08:00
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|
#endif
|
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|
2009-11-09 23:21:34 +08:00
|
|
|
#ifdef CONFIG_INLINE_SPIN_LOCK_IRQSAVE
|
2009-12-04 04:52:18 +08:00
|
|
|
#define _raw_spin_lock_irqsave(lock) __raw_spin_lock_irqsave(lock)
|
2009-08-31 20:43:37 +08:00
|
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|
#endif
|
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|
2009-11-09 23:21:34 +08:00
|
|
|
#ifdef CONFIG_INLINE_SPIN_TRYLOCK
|
2009-12-04 04:52:18 +08:00
|
|
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#define _raw_spin_trylock(lock) __raw_spin_trylock(lock)
|
2009-08-31 20:43:37 +08:00
|
|
|
#endif
|
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|
|
|
2009-11-09 23:21:34 +08:00
|
|
|
#ifdef CONFIG_INLINE_SPIN_TRYLOCK_BH
|
2009-12-04 04:52:18 +08:00
|
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#define _raw_spin_trylock_bh(lock) __raw_spin_trylock_bh(lock)
|
2009-08-31 20:43:37 +08:00
|
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|
#endif
|
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|
|
|
2012-03-22 17:55:08 +08:00
|
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|
#ifndef CONFIG_UNINLINE_SPIN_UNLOCK
|
2009-12-04 04:52:18 +08:00
|
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#define _raw_spin_unlock(lock) __raw_spin_unlock(lock)
|
2009-08-31 20:43:37 +08:00
|
|
|
#endif
|
|
|
|
|
2009-11-09 23:21:34 +08:00
|
|
|
#ifdef CONFIG_INLINE_SPIN_UNLOCK_BH
|
2009-12-04 04:52:18 +08:00
|
|
|
#define _raw_spin_unlock_bh(lock) __raw_spin_unlock_bh(lock)
|
2009-08-31 20:43:37 +08:00
|
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|
#endif
|
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|
|
|
2009-11-09 23:21:34 +08:00
|
|
|
#ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQ
|
2009-12-04 04:52:18 +08:00
|
|
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#define _raw_spin_unlock_irq(lock) __raw_spin_unlock_irq(lock)
|
2009-08-31 20:43:37 +08:00
|
|
|
#endif
|
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|
|
2009-11-09 23:21:34 +08:00
|
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#ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE
|
2009-12-04 04:52:18 +08:00
|
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#define _raw_spin_unlock_irqrestore(lock, flags) __raw_spin_unlock_irqrestore(lock, flags)
|
2009-08-31 20:43:37 +08:00
|
|
|
#endif
|
|
|
|
|
2009-12-04 04:52:18 +08:00
|
|
|
static inline int __raw_spin_trylock(raw_spinlock_t *lock)
|
2009-08-31 20:43:36 +08:00
|
|
|
{
|
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|
|
preempt_disable();
|
2009-12-04 03:55:53 +08:00
|
|
|
if (do_raw_spin_trylock(lock)) {
|
2009-08-31 20:43:36 +08:00
|
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spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
|
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return 1;
|
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|
|
}
|
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|
|
preempt_enable();
|
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|
return 0;
|
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|
|
}
|
|
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|
|
|
|
|
/*
|
|
|
|
* If lockdep is enabled then we use the non-preemption spin-ops
|
2019-07-27 05:19:39 +08:00
|
|
|
* even on CONFIG_PREEMPTION, because lockdep assumes that interrupts are
|
2009-08-31 20:43:36 +08:00
|
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* not re-enabled during lock-acquire (which the preempt-spin-ops do):
|
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*/
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#if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
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2009-12-04 04:52:18 +08:00
|
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static inline unsigned long __raw_spin_lock_irqsave(raw_spinlock_t *lock)
|
2009-08-31 20:43:36 +08:00
|
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{
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|
unsigned long flags;
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local_irq_save(flags);
|
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|
preempt_disable();
|
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spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
|
|
|
|
/*
|
|
|
|
* On lockdep we dont want the hand-coded irq-enable of
|
2009-12-04 03:55:53 +08:00
|
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|
* do_raw_spin_lock_flags() code, because lockdep assumes
|
2009-08-31 20:43:36 +08:00
|
|
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* that interrupts are not re-enabled during lock-acquire:
|
|
|
|
*/
|
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|
|
#ifdef CONFIG_LOCKDEP
|
2009-12-04 03:55:53 +08:00
|
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|
LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
|
2009-08-31 20:43:36 +08:00
|
|
|
#else
|
2009-12-04 03:55:53 +08:00
|
|
|
do_raw_spin_lock_flags(lock, &flags);
|
2009-08-31 20:43:36 +08:00
|
|
|
#endif
|
|
|
|
return flags;
|
|
|
|
}
|
|
|
|
|
2009-12-04 04:52:18 +08:00
|
|
|
static inline void __raw_spin_lock_irq(raw_spinlock_t *lock)
|
2009-08-31 20:43:36 +08:00
|
|
|
{
|
|
|
|
local_irq_disable();
|
|
|
|
preempt_disable();
|
|
|
|
spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
|
2009-12-04 03:55:53 +08:00
|
|
|
LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
|
2009-08-31 20:43:36 +08:00
|
|
|
}
|
|
|
|
|
2009-12-04 04:52:18 +08:00
|
|
|
static inline void __raw_spin_lock_bh(raw_spinlock_t *lock)
|
2009-08-31 20:43:36 +08:00
|
|
|
{
|
2013-11-19 23:13:38 +08:00
|
|
|
__local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
|
2009-08-31 20:43:36 +08:00
|
|
|
spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
|
2009-12-04 03:55:53 +08:00
|
|
|
LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
|
2009-08-31 20:43:36 +08:00
|
|
|
}
|
|
|
|
|
2009-12-04 04:52:18 +08:00
|
|
|
static inline void __raw_spin_lock(raw_spinlock_t *lock)
|
2009-08-31 20:43:36 +08:00
|
|
|
{
|
|
|
|
preempt_disable();
|
|
|
|
spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
|
2009-12-04 03:55:53 +08:00
|
|
|
LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
|
2009-08-31 20:43:36 +08:00
|
|
|
}
|
|
|
|
|
2013-06-19 11:15:46 +08:00
|
|
|
#endif /* !CONFIG_GENERIC_LOCKBREAK || CONFIG_DEBUG_LOCK_ALLOC */
|
2009-08-31 20:43:36 +08:00
|
|
|
|
2009-12-04 04:52:18 +08:00
|
|
|
static inline void __raw_spin_unlock(raw_spinlock_t *lock)
|
2009-08-31 20:43:36 +08:00
|
|
|
{
|
2019-09-20 00:09:40 +08:00
|
|
|
spin_release(&lock->dep_map, _RET_IP_);
|
2009-12-04 03:55:53 +08:00
|
|
|
do_raw_spin_unlock(lock);
|
2009-08-31 20:43:36 +08:00
|
|
|
preempt_enable();
|
|
|
|
}
|
|
|
|
|
2009-12-04 04:52:18 +08:00
|
|
|
static inline void __raw_spin_unlock_irqrestore(raw_spinlock_t *lock,
|
2009-08-31 20:43:36 +08:00
|
|
|
unsigned long flags)
|
|
|
|
{
|
2019-09-20 00:09:40 +08:00
|
|
|
spin_release(&lock->dep_map, _RET_IP_);
|
2009-12-04 03:55:53 +08:00
|
|
|
do_raw_spin_unlock(lock);
|
2009-08-31 20:43:36 +08:00
|
|
|
local_irq_restore(flags);
|
|
|
|
preempt_enable();
|
|
|
|
}
|
|
|
|
|
2009-12-04 04:52:18 +08:00
|
|
|
static inline void __raw_spin_unlock_irq(raw_spinlock_t *lock)
|
2009-08-31 20:43:36 +08:00
|
|
|
{
|
2019-09-20 00:09:40 +08:00
|
|
|
spin_release(&lock->dep_map, _RET_IP_);
|
2009-12-04 03:55:53 +08:00
|
|
|
do_raw_spin_unlock(lock);
|
2009-08-31 20:43:36 +08:00
|
|
|
local_irq_enable();
|
|
|
|
preempt_enable();
|
|
|
|
}
|
|
|
|
|
2009-12-04 04:52:18 +08:00
|
|
|
static inline void __raw_spin_unlock_bh(raw_spinlock_t *lock)
|
2009-08-31 20:43:36 +08:00
|
|
|
{
|
2019-09-20 00:09:40 +08:00
|
|
|
spin_release(&lock->dep_map, _RET_IP_);
|
2009-12-04 03:55:53 +08:00
|
|
|
do_raw_spin_unlock(lock);
|
2013-11-19 23:13:38 +08:00
|
|
|
__local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
|
2009-08-31 20:43:36 +08:00
|
|
|
}
|
|
|
|
|
2009-12-04 04:52:18 +08:00
|
|
|
static inline int __raw_spin_trylock_bh(raw_spinlock_t *lock)
|
2009-08-31 20:43:36 +08:00
|
|
|
{
|
2013-11-19 23:13:38 +08:00
|
|
|
__local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
|
2009-12-04 03:55:53 +08:00
|
|
|
if (do_raw_spin_trylock(lock)) {
|
2009-08-31 20:43:36 +08:00
|
|
|
spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
|
|
|
|
return 1;
|
|
|
|
}
|
2013-11-19 23:13:38 +08:00
|
|
|
__local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
|
2009-08-31 20:43:36 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2009-11-17 01:48:37 +08:00
|
|
|
#include <linux/rwlock_api_smp.h>
|
|
|
|
|
[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 15:25:56 +08:00
|
|
|
#endif /* __LINUX_SPINLOCK_API_SMP_H */
|