c2f21ce2e3
Now that the raw_spin name space is freed up, we can implement raw_spinlock and the related functions which are used to annotate the locks which are not converted to sleeping spinlocks in preempt-rt. A side effect is that only such locks can be used with the low level lock fsunctions which circumvent lockdep. For !rt spin_* functions are mapped to the raw_spin* implementations. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Ingo Molnar <mingo@elte.hu>
97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
#ifndef __LINUX_SPINLOCK_TYPES_H
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#define __LINUX_SPINLOCK_TYPES_H
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/*
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* include/linux/spinlock_types.h - generic spinlock type definitions
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* and initializers
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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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#if defined(CONFIG_SMP)
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# include <asm/spinlock_types.h>
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#else
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# include <linux/spinlock_types_up.h>
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#endif
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#include <linux/lockdep.h>
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typedef struct raw_spinlock {
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arch_spinlock_t raw_lock;
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#ifdef CONFIG_GENERIC_LOCKBREAK
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unsigned int break_lock;
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#endif
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#ifdef CONFIG_DEBUG_SPINLOCK
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unsigned int magic, owner_cpu;
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void *owner;
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#endif
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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struct lockdep_map dep_map;
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#endif
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} raw_spinlock_t;
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#define SPINLOCK_MAGIC 0xdead4ead
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#define SPINLOCK_OWNER_INIT ((void *)-1L)
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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# define SPIN_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
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#else
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# define SPIN_DEP_MAP_INIT(lockname)
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#endif
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#ifdef CONFIG_DEBUG_SPINLOCK
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# define SPIN_DEBUG_INIT(lockname) \
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.magic = SPINLOCK_MAGIC, \
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.owner_cpu = -1, \
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.owner = SPINLOCK_OWNER_INIT,
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#else
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# define SPIN_DEBUG_INIT(lockname)
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#endif
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#define __RAW_SPIN_LOCK_INITIALIZER(lockname) \
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{ \
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.raw_lock = __ARCH_SPIN_LOCK_UNLOCKED, \
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SPIN_DEBUG_INIT(lockname) \
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SPIN_DEP_MAP_INIT(lockname) }
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#define __RAW_SPIN_LOCK_UNLOCKED(lockname) \
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(raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname)
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#define DEFINE_RAW_SPINLOCK(x) raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x)
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typedef struct spinlock {
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union {
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struct raw_spinlock rlock;
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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# define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map))
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struct {
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u8 __padding[LOCK_PADSIZE];
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struct lockdep_map dep_map;
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};
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#endif
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};
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} spinlock_t;
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#define __SPIN_LOCK_INITIALIZER(lockname) \
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{ { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } }
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#define __SPIN_LOCK_UNLOCKED(lockname) \
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(spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname)
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/*
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* SPIN_LOCK_UNLOCKED defeats lockdep state tracking and is hence
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* deprecated.
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* Please use DEFINE_SPINLOCK() or __SPIN_LOCK_UNLOCKED() as
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* appropriate.
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*/
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#define SPIN_LOCK_UNLOCKED __SPIN_LOCK_UNLOCKED(old_style_spin_init)
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#define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
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#include <linux/rwlock_types.h>
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#endif /* __LINUX_SPINLOCK_TYPES_H */
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