mirror of https://gitee.com/openkylin/linux.git
locking: Reduce ifdefs in kernel/spinlock.c
With the Kconfig based inline decisions we can remove extra ifdefs in kernel/spinlock.c by creating the complex lockbreak functions as inlines which are inserted into the non inlined lock functions. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> LKML-Reference: <20091109151428.548614772@linutronix.de> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Reviewed-by: Ingo Molnar <mingo@elte.hu> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Thomas Gleixner
parent
6beb000923
commit
8e13c7b772
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@ -21,6 +21,133 @@
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#include <linux/debug_locks.h>
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#include <linux/module.h>
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/*
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* If lockdep is enabled then we use the non-preemption spin-ops
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* even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
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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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/*
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* The __lock_function inlines are taken from
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* include/linux/spinlock_api_smp.h
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*/
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#else
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/*
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* We build the __lock_function inlines here. They are too large for
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* inlining all over the place, but here is only one user per function
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* which embedds them into the calling _lock_function below.
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*
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* This could be a long-held lock. We both prepare to spin for a long
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* time (making _this_ CPU preemptable if possible), and we also signal
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* towards that other CPU that it should break the lock ASAP.
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*/
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#define BUILD_LOCK_OPS(op, locktype) \
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void __lockfunc __##op##_lock(locktype##_t *lock) \
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{ \
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for (;;) { \
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preempt_disable(); \
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if (likely(_raw_##op##_trylock(lock))) \
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break; \
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preempt_enable(); \
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\
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if (!(lock)->break_lock) \
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(lock)->break_lock = 1; \
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while (!op##_can_lock(lock) && (lock)->break_lock) \
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_raw_##op##_relax(&lock->raw_lock); \
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} \
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(lock)->break_lock = 0; \
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} \
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\
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unsigned long __lockfunc __##op##_lock_irqsave(locktype##_t *lock) \
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{ \
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unsigned long flags; \
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\
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for (;;) { \
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preempt_disable(); \
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local_irq_save(flags); \
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if (likely(_raw_##op##_trylock(lock))) \
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break; \
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local_irq_restore(flags); \
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preempt_enable(); \
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\
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if (!(lock)->break_lock) \
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(lock)->break_lock = 1; \
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while (!op##_can_lock(lock) && (lock)->break_lock) \
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_raw_##op##_relax(&lock->raw_lock); \
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} \
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(lock)->break_lock = 0; \
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return flags; \
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} \
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\
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void __lockfunc __##op##_lock_irq(locktype##_t *lock) \
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{ \
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_##op##_lock_irqsave(lock); \
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} \
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\
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void __lockfunc __##op##_lock_bh(locktype##_t *lock) \
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{ \
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unsigned long flags; \
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\
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/* */ \
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/* Careful: we must exclude softirqs too, hence the */ \
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/* irq-disabling. We use the generic preemption-aware */ \
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/* function: */ \
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/**/ \
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flags = _##op##_lock_irqsave(lock); \
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local_bh_disable(); \
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local_irq_restore(flags); \
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} \
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/*
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* Build preemption-friendly versions of the following
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* lock-spinning functions:
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*
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* __[spin|read|write]_lock()
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* __[spin|read|write]_lock_irq()
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* __[spin|read|write]_lock_irqsave()
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* __[spin|read|write]_lock_bh()
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*/
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BUILD_LOCK_OPS(spin, spinlock);
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BUILD_LOCK_OPS(read, rwlock);
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BUILD_LOCK_OPS(write, rwlock);
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#endif
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass)
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{
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preempt_disable();
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spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
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LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
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}
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EXPORT_SYMBOL(_spin_lock_nested);
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unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock,
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int subclass)
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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, subclass, 0, _RET_IP_);
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LOCK_CONTENDED_FLAGS(lock, _raw_spin_trylock, _raw_spin_lock,
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_raw_spin_lock_flags, &flags);
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return flags;
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}
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EXPORT_SYMBOL(_spin_lock_irqsave_nested);
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void __lockfunc _spin_lock_nest_lock(spinlock_t *lock,
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struct lockdep_map *nest_lock)
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{
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preempt_disable();
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spin_acquire_nest(&lock->dep_map, 0, 0, nest_lock, _RET_IP_);
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LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
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}
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EXPORT_SYMBOL(_spin_lock_nest_lock);
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#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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{
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@ -45,13 +172,6 @@ int __lockfunc _write_trylock(rwlock_t *lock)
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EXPORT_SYMBOL(_write_trylock);
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#endif
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/*
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* If lockdep is enabled then we use the non-preemption spin-ops
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* even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
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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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#ifndef CONFIG_INLINE_READ_LOCK
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void __lockfunc _read_lock(rwlock_t *lock)
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{
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@ -148,130 +268,6 @@ void __lockfunc _write_lock(rwlock_t *lock)
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EXPORT_SYMBOL(_write_lock);
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#endif
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#else /* CONFIG_PREEMPT: */
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/*
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* This could be a long-held lock. We both prepare to spin for a long
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* time (making _this_ CPU preemptable if possible), and we also signal
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* towards that other CPU that it should break the lock ASAP.
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*
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* (We do this in a function because inlining it would be excessive.)
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*/
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#define BUILD_LOCK_OPS(op, locktype) \
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void __lockfunc _##op##_lock(locktype##_t *lock) \
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{ \
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for (;;) { \
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preempt_disable(); \
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if (likely(_raw_##op##_trylock(lock))) \
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break; \
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preempt_enable(); \
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\
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if (!(lock)->break_lock) \
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(lock)->break_lock = 1; \
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while (!op##_can_lock(lock) && (lock)->break_lock) \
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_raw_##op##_relax(&lock->raw_lock); \
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} \
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(lock)->break_lock = 0; \
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} \
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\
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EXPORT_SYMBOL(_##op##_lock); \
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\
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unsigned long __lockfunc _##op##_lock_irqsave(locktype##_t *lock) \
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{ \
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unsigned long flags; \
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\
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for (;;) { \
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preempt_disable(); \
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local_irq_save(flags); \
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if (likely(_raw_##op##_trylock(lock))) \
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break; \
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local_irq_restore(flags); \
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preempt_enable(); \
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\
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if (!(lock)->break_lock) \
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(lock)->break_lock = 1; \
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while (!op##_can_lock(lock) && (lock)->break_lock) \
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_raw_##op##_relax(&lock->raw_lock); \
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} \
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(lock)->break_lock = 0; \
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return flags; \
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} \
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\
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EXPORT_SYMBOL(_##op##_lock_irqsave); \
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\
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void __lockfunc _##op##_lock_irq(locktype##_t *lock) \
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{ \
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_##op##_lock_irqsave(lock); \
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} \
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\
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EXPORT_SYMBOL(_##op##_lock_irq); \
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\
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void __lockfunc _##op##_lock_bh(locktype##_t *lock) \
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{ \
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unsigned long flags; \
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\
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/* */ \
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/* Careful: we must exclude softirqs too, hence the */ \
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/* irq-disabling. We use the generic preemption-aware */ \
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/* function: */ \
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/**/ \
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flags = _##op##_lock_irqsave(lock); \
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local_bh_disable(); \
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local_irq_restore(flags); \
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} \
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\
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EXPORT_SYMBOL(_##op##_lock_bh)
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/*
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* Build preemption-friendly versions of the following
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* lock-spinning functions:
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*
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* _[spin|read|write]_lock()
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* _[spin|read|write]_lock_irq()
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* _[spin|read|write]_lock_irqsave()
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* _[spin|read|write]_lock_bh()
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*/
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BUILD_LOCK_OPS(spin, spinlock);
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BUILD_LOCK_OPS(read, rwlock);
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BUILD_LOCK_OPS(write, rwlock);
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#endif /* CONFIG_PREEMPT */
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass)
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{
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preempt_disable();
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spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
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LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
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}
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EXPORT_SYMBOL(_spin_lock_nested);
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unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock, int subclass)
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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, subclass, 0, _RET_IP_);
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LOCK_CONTENDED_FLAGS(lock, _raw_spin_trylock, _raw_spin_lock,
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_raw_spin_lock_flags, &flags);
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return flags;
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}
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EXPORT_SYMBOL(_spin_lock_irqsave_nested);
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void __lockfunc _spin_lock_nest_lock(spinlock_t *lock,
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struct lockdep_map *nest_lock)
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{
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preempt_disable();
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spin_acquire_nest(&lock->dep_map, 0, 0, nest_lock, _RET_IP_);
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LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
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}
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EXPORT_SYMBOL(_spin_lock_nest_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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{
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