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[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>
This commit is contained in:
Ingo Molnar
Linus Torvalds
parent
4327edf6b8
commit
fb1c8f93d8
69 changed files with 1617 additions and 2897 deletions
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@ -2,7 +2,48 @@
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#define __LINUX_SPINLOCK_H
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/*
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* include/linux/spinlock.h - generic locking declarations
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* include/linux/spinlock.h - generic spinlock/rwlock declarations
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*
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* here's the role of the various spinlock/rwlock related include files:
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*
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* on SMP builds:
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*
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* asm/spinlock_types.h: contains the raw_spinlock_t/raw_rwlock_t and the
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* initializers
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*
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* linux/spinlock_types.h:
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* defines the generic type and initializers
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*
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* asm/spinlock.h: contains the __raw_spin_*()/etc. lowlevel
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* implementations, mostly inline assembly code
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*
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* (also included on UP-debug builds:)
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*
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* linux/spinlock_api_smp.h:
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* contains the prototypes for the _spin_*() APIs.
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*
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* linux/spinlock.h: builds the final spin_*() APIs.
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*
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* on UP builds:
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*
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* linux/spinlock_type_up.h:
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* contains the generic, simplified UP spinlock type.
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* (which is an empty structure on non-debug builds)
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*
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* linux/spinlock_types.h:
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* defines the generic type and initializers
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*
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* linux/spinlock_up.h:
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* contains the __raw_spin_*()/etc. version of UP
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* builds. (which are NOPs on non-debug, non-preempt
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* builds)
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*
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* (included on UP-non-debug builds:)
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*
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* linux/spinlock_api_up.h:
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* builds the _spin_*() APIs.
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*
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* linux/spinlock.h: builds the final spin_*() APIs.
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*/
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#include <linux/config.h>
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@ -13,7 +54,6 @@
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#include <linux/kernel.h>
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#include <linux/stringify.h>
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#include <asm/processor.h> /* for cpu relax */
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#include <asm/system.h>
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/*
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@ -35,423 +75,84 @@
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#define __lockfunc fastcall __attribute__((section(".spinlock.text")))
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/*
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* If CONFIG_SMP is set, pull in the _raw_* definitions
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* Pull the raw_spinlock_t and raw_rwlock_t definitions:
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*/
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#ifdef CONFIG_SMP
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#include <linux/spinlock_types.h>
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#define assert_spin_locked(x) BUG_ON(!spin_is_locked(x))
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#include <asm/spinlock.h>
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int __lockfunc _spin_trylock(spinlock_t *lock);
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int __lockfunc _read_trylock(rwlock_t *lock);
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int __lockfunc _write_trylock(rwlock_t *lock);
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void __lockfunc _spin_lock(spinlock_t *lock) __acquires(spinlock_t);
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void __lockfunc _read_lock(rwlock_t *lock) __acquires(rwlock_t);
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void __lockfunc _write_lock(rwlock_t *lock) __acquires(rwlock_t);
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void __lockfunc _spin_unlock(spinlock_t *lock) __releases(spinlock_t);
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void __lockfunc _read_unlock(rwlock_t *lock) __releases(rwlock_t);
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void __lockfunc _write_unlock(rwlock_t *lock) __releases(rwlock_t);
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unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock) __acquires(spinlock_t);
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unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock) __acquires(rwlock_t);
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unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock) __acquires(rwlock_t);
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void __lockfunc _spin_lock_irq(spinlock_t *lock) __acquires(spinlock_t);
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void __lockfunc _spin_lock_bh(spinlock_t *lock) __acquires(spinlock_t);
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void __lockfunc _read_lock_irq(rwlock_t *lock) __acquires(rwlock_t);
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void __lockfunc _read_lock_bh(rwlock_t *lock) __acquires(rwlock_t);
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void __lockfunc _write_lock_irq(rwlock_t *lock) __acquires(rwlock_t);
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void __lockfunc _write_lock_bh(rwlock_t *lock) __acquires(rwlock_t);
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void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags) __releases(spinlock_t);
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void __lockfunc _spin_unlock_irq(spinlock_t *lock) __releases(spinlock_t);
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void __lockfunc _spin_unlock_bh(spinlock_t *lock) __releases(spinlock_t);
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void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags) __releases(rwlock_t);
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void __lockfunc _read_unlock_irq(rwlock_t *lock) __releases(rwlock_t);
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void __lockfunc _read_unlock_bh(rwlock_t *lock) __releases(rwlock_t);
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void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags) __releases(rwlock_t);
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void __lockfunc _write_unlock_irq(rwlock_t *lock) __releases(rwlock_t);
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void __lockfunc _write_unlock_bh(rwlock_t *lock) __releases(rwlock_t);
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int __lockfunc _spin_trylock_bh(spinlock_t *lock);
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int __lockfunc generic_raw_read_trylock(rwlock_t *lock);
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int in_lock_functions(unsigned long addr);
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extern int __lockfunc generic__raw_read_trylock(raw_rwlock_t *lock);
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/*
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* Pull the __raw*() functions/declarations (UP-nondebug doesnt need them):
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*/
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#if defined(CONFIG_SMP)
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# include <asm/spinlock.h>
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#else
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# include <linux/spinlock_up.h>
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#endif
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#define in_lock_functions(ADDR) 0
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#define spin_lock_init(lock) do { *(lock) = SPIN_LOCK_UNLOCKED; } while (0)
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#define rwlock_init(lock) do { *(lock) = RW_LOCK_UNLOCKED; } while (0)
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#if !defined(CONFIG_PREEMPT) && !defined(CONFIG_DEBUG_SPINLOCK)
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# define _atomic_dec_and_lock(atomic,lock) atomic_dec_and_test(atomic)
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# define ATOMIC_DEC_AND_LOCK
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#define spin_is_locked(lock) __raw_spin_is_locked(&(lock)->raw_lock)
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/**
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* spin_unlock_wait - wait until the spinlock gets unlocked
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* @lock: the spinlock in question.
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*/
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#define spin_unlock_wait(lock) __raw_spin_unlock_wait(&(lock)->raw_lock)
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/*
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* Pull the _spin_*()/_read_*()/_write_*() functions/declarations:
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*/
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#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
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# include <linux/spinlock_api_smp.h>
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#else
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# include <linux/spinlock_api_up.h>
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#endif
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#ifdef CONFIG_DEBUG_SPINLOCK
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#define SPINLOCK_MAGIC 0x1D244B3C
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typedef struct {
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unsigned long magic;
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volatile unsigned long lock;
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volatile unsigned int babble;
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const char *module;
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char *owner;
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int oline;
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} spinlock_t;
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#define SPIN_LOCK_UNLOCKED (spinlock_t) { SPINLOCK_MAGIC, 0, 10, __FILE__ , NULL, 0}
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extern void _raw_spin_lock(spinlock_t *lock);
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#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
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extern int _raw_spin_trylock(spinlock_t *lock);
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extern void _raw_spin_unlock(spinlock_t *lock);
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#define spin_lock_init(x) \
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do { \
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(x)->magic = SPINLOCK_MAGIC; \
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(x)->lock = 0; \
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(x)->babble = 5; \
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(x)->module = __FILE__; \
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(x)->owner = NULL; \
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(x)->oline = 0; \
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} while (0)
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#define CHECK_LOCK(x) \
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do { \
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if ((x)->magic != SPINLOCK_MAGIC) { \
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printk(KERN_ERR "%s:%d: spin_is_locked on uninitialized spinlock %p.\n", \
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__FILE__, __LINE__, (x)); \
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} \
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} while(0)
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#define _raw_spin_lock(x) \
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do { \
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CHECK_LOCK(x); \
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if ((x)->lock&&(x)->babble) { \
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(x)->babble--; \
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printk("%s:%d: spin_lock(%s:%p) already locked by %s/%d\n", \
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__FILE__,__LINE__, (x)->module, \
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(x), (x)->owner, (x)->oline); \
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} \
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(x)->lock = 1; \
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(x)->owner = __FILE__; \
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(x)->oline = __LINE__; \
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} while (0)
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/* without debugging, spin_is_locked on UP always says
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* FALSE. --> printk if already locked. */
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#define spin_is_locked(x) \
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({ \
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CHECK_LOCK(x); \
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if ((x)->lock&&(x)->babble) { \
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(x)->babble--; \
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printk("%s:%d: spin_is_locked(%s:%p) already locked by %s/%d\n", \
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__FILE__,__LINE__, (x)->module, \
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(x), (x)->owner, (x)->oline); \
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} \
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0; \
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})
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/* with debugging, assert_spin_locked() on UP does check
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* the lock value properly */
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#define assert_spin_locked(x) \
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({ \
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CHECK_LOCK(x); \
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BUG_ON(!(x)->lock); \
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})
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/* without debugging, spin_trylock on UP always says
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* TRUE. --> printk if already locked. */
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#define _raw_spin_trylock(x) \
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({ \
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CHECK_LOCK(x); \
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if ((x)->lock&&(x)->babble) { \
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(x)->babble--; \
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printk("%s:%d: spin_trylock(%s:%p) already locked by %s/%d\n", \
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__FILE__,__LINE__, (x)->module, \
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(x), (x)->owner, (x)->oline); \
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} \
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(x)->lock = 1; \
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(x)->owner = __FILE__; \
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(x)->oline = __LINE__; \
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1; \
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})
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#define spin_unlock_wait(x) \
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do { \
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CHECK_LOCK(x); \
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if ((x)->lock&&(x)->babble) { \
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(x)->babble--; \
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printk("%s:%d: spin_unlock_wait(%s:%p) owned by %s/%d\n", \
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__FILE__,__LINE__, (x)->module, (x), \
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(x)->owner, (x)->oline); \
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}\
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} while (0)
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#define _raw_spin_unlock(x) \
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do { \
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CHECK_LOCK(x); \
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if (!(x)->lock&&(x)->babble) { \
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(x)->babble--; \
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printk("%s:%d: spin_unlock(%s:%p) not locked\n", \
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__FILE__,__LINE__, (x)->module, (x));\
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} \
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(x)->lock = 0; \
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} while (0)
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extern void _raw_read_lock(rwlock_t *lock);
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extern int _raw_read_trylock(rwlock_t *lock);
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extern void _raw_read_unlock(rwlock_t *lock);
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extern void _raw_write_lock(rwlock_t *lock);
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extern int _raw_write_trylock(rwlock_t *lock);
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extern void _raw_write_unlock(rwlock_t *lock);
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#else
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/*
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* gcc versions before ~2.95 have a nasty bug with empty initializers.
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*/
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#if (__GNUC__ > 2)
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typedef struct { } spinlock_t;
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#define SPIN_LOCK_UNLOCKED (spinlock_t) { }
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#else
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typedef struct { int gcc_is_buggy; } spinlock_t;
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#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 }
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# define _raw_spin_unlock(lock) __raw_spin_unlock(&(lock)->raw_lock)
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# define _raw_spin_trylock(lock) __raw_spin_trylock(&(lock)->raw_lock)
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# define _raw_spin_lock(lock) __raw_spin_lock(&(lock)->raw_lock)
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# define _raw_spin_lock_flags(lock, flags) \
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__raw_spin_lock_flags(&(lock)->raw_lock, *(flags))
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# define _raw_read_lock(rwlock) __raw_read_lock(&(rwlock)->raw_lock)
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# define _raw_write_lock(rwlock) __raw_write_lock(&(rwlock)->raw_lock)
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# define _raw_read_unlock(rwlock) __raw_read_unlock(&(rwlock)->raw_lock)
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# define _raw_write_unlock(rwlock) __raw_write_unlock(&(rwlock)->raw_lock)
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# define _raw_read_trylock(rwlock) __raw_read_trylock(&(rwlock)->raw_lock)
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# define _raw_write_trylock(rwlock) __raw_write_trylock(&(rwlock)->raw_lock)
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#endif
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/*
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* If CONFIG_SMP is unset, declare the _raw_* definitions as nops
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*/
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#define spin_lock_init(lock) do { (void)(lock); } while(0)
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#define _raw_spin_lock(lock) do { (void)(lock); } while(0)
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#define spin_is_locked(lock) ((void)(lock), 0)
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#define assert_spin_locked(lock) do { (void)(lock); } while(0)
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#define _raw_spin_trylock(lock) (((void)(lock), 1))
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#define spin_unlock_wait(lock) (void)(lock)
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#define _raw_spin_unlock(lock) do { (void)(lock); } while(0)
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#endif /* CONFIG_DEBUG_SPINLOCK */
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/* RW spinlocks: No debug version */
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#if (__GNUC__ > 2)
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typedef struct { } rwlock_t;
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#define RW_LOCK_UNLOCKED (rwlock_t) { }
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#else
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typedef struct { int gcc_is_buggy; } rwlock_t;
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#define RW_LOCK_UNLOCKED (rwlock_t) { 0 }
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#endif
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#define rwlock_init(lock) do { (void)(lock); } while(0)
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#define _raw_read_lock(lock) do { (void)(lock); } while(0)
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#define _raw_read_unlock(lock) do { (void)(lock); } while(0)
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#define _raw_write_lock(lock) do { (void)(lock); } while(0)
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#define _raw_write_unlock(lock) do { (void)(lock); } while(0)
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#define read_can_lock(lock) (((void)(lock), 1))
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#define write_can_lock(lock) (((void)(lock), 1))
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#define _raw_read_trylock(lock) ({ (void)(lock); (1); })
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#define _raw_write_trylock(lock) ({ (void)(lock); (1); })
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#define _spin_trylock(lock) ({preempt_disable(); _raw_spin_trylock(lock) ? \
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1 : ({preempt_enable(); 0;});})
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#define _read_trylock(lock) ({preempt_disable();_raw_read_trylock(lock) ? \
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1 : ({preempt_enable(); 0;});})
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#define _write_trylock(lock) ({preempt_disable(); _raw_write_trylock(lock) ? \
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1 : ({preempt_enable(); 0;});})
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#define _spin_trylock_bh(lock) ({preempt_disable(); local_bh_disable(); \
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_raw_spin_trylock(lock) ? \
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1 : ({preempt_enable_no_resched(); local_bh_enable(); 0;});})
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#define _spin_lock(lock) \
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do { \
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preempt_disable(); \
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_raw_spin_lock(lock); \
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__acquire(lock); \
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} while(0)
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#define _write_lock(lock) \
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do { \
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preempt_disable(); \
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_raw_write_lock(lock); \
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__acquire(lock); \
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} while(0)
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#define _read_lock(lock) \
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do { \
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preempt_disable(); \
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_raw_read_lock(lock); \
|
||||
__acquire(lock); \
|
||||
} while(0)
|
||||
|
||||
#define _spin_unlock(lock) \
|
||||
do { \
|
||||
_raw_spin_unlock(lock); \
|
||||
preempt_enable(); \
|
||||
__release(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _write_unlock(lock) \
|
||||
do { \
|
||||
_raw_write_unlock(lock); \
|
||||
preempt_enable(); \
|
||||
__release(lock); \
|
||||
} while(0)
|
||||
|
||||
#define _read_unlock(lock) \
|
||||
do { \
|
||||
_raw_read_unlock(lock); \
|
||||
preempt_enable(); \
|
||||
__release(lock); \
|
||||
} while(0)
|
||||
|
||||
#define _spin_lock_irqsave(lock, flags) \
|
||||
do { \
|
||||
local_irq_save(flags); \
|
||||
preempt_disable(); \
|
||||
_raw_spin_lock(lock); \
|
||||
__acquire(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _spin_lock_irq(lock) \
|
||||
do { \
|
||||
local_irq_disable(); \
|
||||
preempt_disable(); \
|
||||
_raw_spin_lock(lock); \
|
||||
__acquire(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _spin_lock_bh(lock) \
|
||||
do { \
|
||||
local_bh_disable(); \
|
||||
preempt_disable(); \
|
||||
_raw_spin_lock(lock); \
|
||||
__acquire(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _read_lock_irqsave(lock, flags) \
|
||||
do { \
|
||||
local_irq_save(flags); \
|
||||
preempt_disable(); \
|
||||
_raw_read_lock(lock); \
|
||||
__acquire(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _read_lock_irq(lock) \
|
||||
do { \
|
||||
local_irq_disable(); \
|
||||
preempt_disable(); \
|
||||
_raw_read_lock(lock); \
|
||||
__acquire(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _read_lock_bh(lock) \
|
||||
do { \
|
||||
local_bh_disable(); \
|
||||
preempt_disable(); \
|
||||
_raw_read_lock(lock); \
|
||||
__acquire(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _write_lock_irqsave(lock, flags) \
|
||||
do { \
|
||||
local_irq_save(flags); \
|
||||
preempt_disable(); \
|
||||
_raw_write_lock(lock); \
|
||||
__acquire(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _write_lock_irq(lock) \
|
||||
do { \
|
||||
local_irq_disable(); \
|
||||
preempt_disable(); \
|
||||
_raw_write_lock(lock); \
|
||||
__acquire(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _write_lock_bh(lock) \
|
||||
do { \
|
||||
local_bh_disable(); \
|
||||
preempt_disable(); \
|
||||
_raw_write_lock(lock); \
|
||||
__acquire(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _spin_unlock_irqrestore(lock, flags) \
|
||||
do { \
|
||||
_raw_spin_unlock(lock); \
|
||||
local_irq_restore(flags); \
|
||||
preempt_enable(); \
|
||||
__release(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _spin_unlock_irq(lock) \
|
||||
do { \
|
||||
_raw_spin_unlock(lock); \
|
||||
local_irq_enable(); \
|
||||
preempt_enable(); \
|
||||
__release(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _spin_unlock_bh(lock) \
|
||||
do { \
|
||||
_raw_spin_unlock(lock); \
|
||||
preempt_enable_no_resched(); \
|
||||
local_bh_enable(); \
|
||||
__release(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _write_unlock_bh(lock) \
|
||||
do { \
|
||||
_raw_write_unlock(lock); \
|
||||
preempt_enable_no_resched(); \
|
||||
local_bh_enable(); \
|
||||
__release(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _read_unlock_irqrestore(lock, flags) \
|
||||
do { \
|
||||
_raw_read_unlock(lock); \
|
||||
local_irq_restore(flags); \
|
||||
preempt_enable(); \
|
||||
__release(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _write_unlock_irqrestore(lock, flags) \
|
||||
do { \
|
||||
_raw_write_unlock(lock); \
|
||||
local_irq_restore(flags); \
|
||||
preempt_enable(); \
|
||||
__release(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _read_unlock_irq(lock) \
|
||||
do { \
|
||||
_raw_read_unlock(lock); \
|
||||
local_irq_enable(); \
|
||||
preempt_enable(); \
|
||||
__release(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _read_unlock_bh(lock) \
|
||||
do { \
|
||||
_raw_read_unlock(lock); \
|
||||
preempt_enable_no_resched(); \
|
||||
local_bh_enable(); \
|
||||
__release(lock); \
|
||||
} while (0)
|
||||
|
||||
#define _write_unlock_irq(lock) \
|
||||
do { \
|
||||
_raw_write_unlock(lock); \
|
||||
local_irq_enable(); \
|
||||
preempt_enable(); \
|
||||
__release(lock); \
|
||||
} while (0)
|
||||
|
||||
#endif /* !SMP */
|
||||
#define read_can_lock(rwlock) __raw_read_can_lock(&(rwlock)->raw_lock)
|
||||
#define write_can_lock(rwlock) __raw_write_can_lock(&(rwlock)->raw_lock)
|
||||
|
||||
/*
|
||||
* Define the various spin_lock and rw_lock methods. Note we define these
|
||||
* regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various
|
||||
* methods are defined as nops in the case they are not required.
|
||||
*/
|
||||
#define spin_trylock(lock) __cond_lock(_spin_trylock(lock))
|
||||
#define read_trylock(lock) __cond_lock(_read_trylock(lock))
|
||||
#define write_trylock(lock) __cond_lock(_write_trylock(lock))
|
||||
#define spin_trylock(lock) __cond_lock(_spin_trylock(lock))
|
||||
#define read_trylock(lock) __cond_lock(_read_trylock(lock))
|
||||
#define write_trylock(lock) __cond_lock(_write_trylock(lock))
|
||||
|
||||
#define spin_lock(lock) _spin_lock(lock)
|
||||
#define write_lock(lock) _write_lock(lock)
|
||||
#define read_lock(lock) _read_lock(lock)
|
||||
#define spin_lock(lock) _spin_lock(lock)
|
||||
#define write_lock(lock) _write_lock(lock)
|
||||
#define read_lock(lock) _read_lock(lock)
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
|
||||
#define spin_lock_irqsave(lock, flags) flags = _spin_lock_irqsave(lock)
|
||||
#define read_lock_irqsave(lock, flags) flags = _read_lock_irqsave(lock)
|
||||
#define write_lock_irqsave(lock, flags) flags = _write_lock_irqsave(lock)
|
||||
|
|
@ -470,137 +171,59 @@ do { \
|
|||
#define write_lock_irq(lock) _write_lock_irq(lock)
|
||||
#define write_lock_bh(lock) _write_lock_bh(lock)
|
||||
|
||||
#define spin_unlock(lock) _spin_unlock(lock)
|
||||
#define write_unlock(lock) _write_unlock(lock)
|
||||
#define read_unlock(lock) _read_unlock(lock)
|
||||
#define spin_unlock(lock) _spin_unlock(lock)
|
||||
#define write_unlock(lock) _write_unlock(lock)
|
||||
#define read_unlock(lock) _read_unlock(lock)
|
||||
|
||||
#define spin_unlock_irqrestore(lock, flags) _spin_unlock_irqrestore(lock, flags)
|
||||
#define spin_unlock_irqrestore(lock, flags) \
|
||||
_spin_unlock_irqrestore(lock, flags)
|
||||
#define spin_unlock_irq(lock) _spin_unlock_irq(lock)
|
||||
#define spin_unlock_bh(lock) _spin_unlock_bh(lock)
|
||||
|
||||
#define read_unlock_irqrestore(lock, flags) _read_unlock_irqrestore(lock, flags)
|
||||
#define read_unlock_irq(lock) _read_unlock_irq(lock)
|
||||
#define read_unlock_bh(lock) _read_unlock_bh(lock)
|
||||
#define read_unlock_irqrestore(lock, flags) \
|
||||
_read_unlock_irqrestore(lock, flags)
|
||||
#define read_unlock_irq(lock) _read_unlock_irq(lock)
|
||||
#define read_unlock_bh(lock) _read_unlock_bh(lock)
|
||||
|
||||
#define write_unlock_irqrestore(lock, flags) _write_unlock_irqrestore(lock, flags)
|
||||
#define write_unlock_irq(lock) _write_unlock_irq(lock)
|
||||
#define write_unlock_bh(lock) _write_unlock_bh(lock)
|
||||
#define write_unlock_irqrestore(lock, flags) \
|
||||
_write_unlock_irqrestore(lock, flags)
|
||||
#define write_unlock_irq(lock) _write_unlock_irq(lock)
|
||||
#define write_unlock_bh(lock) _write_unlock_bh(lock)
|
||||
|
||||
#define spin_trylock_bh(lock) __cond_lock(_spin_trylock_bh(lock))
|
||||
#define spin_trylock_bh(lock) __cond_lock(_spin_trylock_bh(lock))
|
||||
|
||||
#define spin_trylock_irq(lock) \
|
||||
({ \
|
||||
local_irq_disable(); \
|
||||
_spin_trylock(lock) ? \
|
||||
1 : ({local_irq_enable(); 0; }); \
|
||||
1 : ({ local_irq_enable(); 0; }); \
|
||||
})
|
||||
|
||||
#define spin_trylock_irqsave(lock, flags) \
|
||||
({ \
|
||||
local_irq_save(flags); \
|
||||
_spin_trylock(lock) ? \
|
||||
1 : ({local_irq_restore(flags); 0;}); \
|
||||
1 : ({ local_irq_restore(flags); 0; }); \
|
||||
})
|
||||
|
||||
#ifdef CONFIG_LOCKMETER
|
||||
extern void _metered_spin_lock (spinlock_t *lock);
|
||||
extern void _metered_spin_unlock (spinlock_t *lock);
|
||||
extern int _metered_spin_trylock(spinlock_t *lock);
|
||||
extern void _metered_read_lock (rwlock_t *lock);
|
||||
extern void _metered_read_unlock (rwlock_t *lock);
|
||||
extern void _metered_write_lock (rwlock_t *lock);
|
||||
extern void _metered_write_unlock (rwlock_t *lock);
|
||||
extern int _metered_read_trylock (rwlock_t *lock);
|
||||
extern int _metered_write_trylock(rwlock_t *lock);
|
||||
#endif
|
||||
|
||||
/* "lock on reference count zero" */
|
||||
#ifndef ATOMIC_DEC_AND_LOCK
|
||||
/*
|
||||
* Pull the atomic_t declaration:
|
||||
* (asm-mips/atomic.h needs above definitions)
|
||||
*/
|
||||
#include <asm/atomic.h>
|
||||
/**
|
||||
* atomic_dec_and_lock - lock on reaching reference count zero
|
||||
* @atomic: the atomic counter
|
||||
* @lock: the spinlock in question
|
||||
*/
|
||||
extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock);
|
||||
#endif
|
||||
|
||||
#define atomic_dec_and_lock(atomic,lock) __cond_lock(_atomic_dec_and_lock(atomic,lock))
|
||||
|
||||
/*
|
||||
* bit-based spin_lock()
|
||||
*
|
||||
* Don't use this unless you really need to: spin_lock() and spin_unlock()
|
||||
* are significantly faster.
|
||||
*/
|
||||
static inline void bit_spin_lock(int bitnum, unsigned long *addr)
|
||||
{
|
||||
/*
|
||||
* Assuming the lock is uncontended, this never enters
|
||||
* the body of the outer loop. If it is contended, then
|
||||
* within the inner loop a non-atomic test is used to
|
||||
* busywait with less bus contention for a good time to
|
||||
* attempt to acquire the lock bit.
|
||||
*/
|
||||
preempt_disable();
|
||||
#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
|
||||
while (test_and_set_bit(bitnum, addr)) {
|
||||
while (test_bit(bitnum, addr)) {
|
||||
preempt_enable();
|
||||
cpu_relax();
|
||||
preempt_disable();
|
||||
}
|
||||
}
|
||||
#endif
|
||||
__acquire(bitlock);
|
||||
}
|
||||
|
||||
/*
|
||||
* Return true if it was acquired
|
||||
*/
|
||||
static inline int bit_spin_trylock(int bitnum, unsigned long *addr)
|
||||
{
|
||||
preempt_disable();
|
||||
#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
|
||||
if (test_and_set_bit(bitnum, addr)) {
|
||||
preempt_enable();
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
__acquire(bitlock);
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* bit-based spin_unlock()
|
||||
*/
|
||||
static inline void bit_spin_unlock(int bitnum, unsigned long *addr)
|
||||
{
|
||||
#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
|
||||
BUG_ON(!test_bit(bitnum, addr));
|
||||
smp_mb__before_clear_bit();
|
||||
clear_bit(bitnum, addr);
|
||||
#endif
|
||||
preempt_enable();
|
||||
__release(bitlock);
|
||||
}
|
||||
|
||||
/*
|
||||
* Return true if the lock is held.
|
||||
*/
|
||||
static inline int bit_spin_is_locked(int bitnum, unsigned long *addr)
|
||||
{
|
||||
#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
|
||||
return test_bit(bitnum, addr);
|
||||
#elif defined CONFIG_PREEMPT
|
||||
return preempt_count();
|
||||
#else
|
||||
return 1;
|
||||
#endif
|
||||
}
|
||||
|
||||
#define DEFINE_SPINLOCK(x) spinlock_t x = SPIN_LOCK_UNLOCKED
|
||||
#define DEFINE_RWLOCK(x) rwlock_t x = RW_LOCK_UNLOCKED
|
||||
#define atomic_dec_and_lock(atomic, lock) \
|
||||
__cond_lock(_atomic_dec_and_lock(atomic, lock))
|
||||
|
||||
/**
|
||||
* spin_can_lock - would spin_trylock() succeed?
|
||||
* @lock: the spinlock in question.
|
||||
*/
|
||||
#define spin_can_lock(lock) (!spin_is_locked(lock))
|
||||
#define spin_can_lock(lock) (!spin_is_locked(lock))
|
||||
|
||||
#endif /* __LINUX_SPINLOCK_H */
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue