1#ifndef __LINUX_SPINLOCK_H 2#define __LINUX_SPINLOCK_H 3 4#include <linux/config.h> 5 6#include <asm/system.h> 7 8/* 9 * These are the generic versions of the spinlocks and read-write 10 * locks.. 11 */ 12#define spin_lock_irqsave(lock, flags) do { local_irq_save(flags); spin_lock(lock); } while (0) 13#define spin_lock_irq(lock) do { local_irq_disable(); spin_lock(lock); } while (0) 14#define spin_lock_bh(lock) do { local_bh_disable(); spin_lock(lock); } while (0) 15 16#define read_lock_irqsave(lock, flags) do { local_irq_save(flags); read_lock(lock); } while (0) 17#define read_lock_irq(lock) do { local_irq_disable(); read_lock(lock); } while (0) 18#define read_lock_bh(lock) do { local_bh_disable(); read_lock(lock); } while (0) 19 20#define write_lock_irqsave(lock, flags) do { local_irq_save(flags); write_lock(lock); } while (0) 21#define write_lock_irq(lock) do { local_irq_disable(); write_lock(lock); } while (0) 22#define write_lock_bh(lock) do { local_bh_disable(); write_lock(lock); } while (0) 23 24#define spin_unlock_irqrestore(lock, flags) do { spin_unlock(lock); local_irq_restore(flags); } while (0) 25#define spin_unlock_irq(lock) do { spin_unlock(lock); local_irq_enable(); } while (0) 26#define spin_unlock_bh(lock) do { spin_unlock(lock); local_bh_enable(); } while (0) 27 28#define read_unlock_irqrestore(lock, flags) do { read_unlock(lock); local_irq_restore(flags); } while (0) 29#define read_unlock_irq(lock) do { read_unlock(lock); local_irq_enable(); } while (0) 30#define read_unlock_bh(lock) do { read_unlock(lock); local_bh_enable(); } while (0) 31 32#define write_unlock_irqrestore(lock, flags) do { write_unlock(lock); local_irq_restore(flags); } while (0) 33#define write_unlock_irq(lock) do { write_unlock(lock); local_irq_enable(); } while (0) 34#define write_unlock_bh(lock) do { write_unlock(lock); local_bh_enable(); } while (0) 35#define spin_trylock_bh(lock) ({ int __r; local_bh_disable();\ 36 __r = spin_trylock(lock); \ 37 if (!__r) local_bh_enable(); \ 38 __r; }) 39 40/* Must define these before including other files, inline functions need them */ 41 42#include <linux/stringify.h> 43 44#define LOCK_SECTION_NAME \ 45 ".text.lock." __stringify(KBUILD_BASENAME) 46 47#define LOCK_SECTION_START(extra) \ 48 ".subsection 1\n\t" \ 49 extra \ 50 ".ifndef " LOCK_SECTION_NAME "\n\t" \ 51 LOCK_SECTION_NAME ":\n\t" \ 52 ".endif\n\t" 53 54#define LOCK_SECTION_END \ 55 ".previous\n\t" 56 57#ifdef CONFIG_SMP 58#include <asm/spinlock.h> 59 60#elif !defined(spin_lock_init) /* !SMP and spin_lock_init not previously 61 defined (e.g. by including asm/spinlock.h */ 62 63#define DEBUG_SPINLOCKS 0 /* 0 == no debugging, 1 == maintain lock state, 2 == full debug */ 64 65#if (DEBUG_SPINLOCKS < 1) 66 67#define atomic_dec_and_lock(atomic,lock) atomic_dec_and_test(atomic) 68#define ATOMIC_DEC_AND_LOCK 69 70#if (__GNUC__ > 2 || __GNUC_MINOR__ > 95) 71 typedef struct { } spinlock_t; 72 #define SPIN_LOCK_UNLOCKED (spinlock_t) { } 73#else 74 typedef struct { int gcc_is_buggy; } spinlock_t; 75 #define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 } 76#endif 77 78#define spin_lock_init(lock) do { } while(0) 79#define spin_lock(lock) (void)(lock) /* Not "unused variable". */ 80#define spin_is_locked(lock) (0) 81#define spin_trylock(lock) ({1; }) 82#define spin_unlock_wait(lock) do { } while(0) 83#define spin_unlock(lock) do { } while(0) 84 85#elif (DEBUG_SPINLOCKS < 2) 86 87typedef struct { 88 volatile unsigned long lock; 89} spinlock_t; 90#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 } 91 92#define spin_lock_init(x) do { (x)->lock = 0; } while (0) 93#define spin_is_locked(lock) (test_bit(0,(lock))) 94#define spin_trylock(lock) (!test_and_set_bit(0,(lock))) 95 96#define spin_lock(x) do { (x)->lock = 1; } while (0) 97#define spin_unlock_wait(x) do { } while (0) 98#define spin_unlock(x) do { (x)->lock = 0; } while (0) 99 100#else /* (DEBUG_SPINLOCKS >= 2) */ 101 102typedef struct { 103 volatile unsigned long lock; 104 volatile unsigned int babble; 105 const char *module; 106} spinlock_t; 107#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0, 25, __BASE_FILE__ } 108 109#include <linux/kernel.h> 110 111#define spin_lock_init(x) do { (x)->lock = 0; } while (0) 112#define spin_is_locked(lock) (test_bit(0,(lock))) 113#define spin_trylock(lock) (!test_and_set_bit(0,(lock))) 114 115#define spin_lock(x) do {unsigned long __spinflags; save_flags(__spinflags); cli(); if ((x)->lock&&(x)->babble) {printk("%s:%d: spin_lock(%s:%p) already locked\n", __BASE_FILE__,__LINE__, (x)->module, (x));(x)->babble--;} (x)->lock = 1; restore_flags(__spinflags);} while (0) 116#define spin_unlock_wait(x) do {unsigned long __spinflags; save_flags(__spinflags); cli(); if ((x)->lock&&(x)->babble) {printk("%s:%d: spin_unlock_wait(%s:%p) deadlock\n", __BASE_FILE__,__LINE__, (x)->module, (x));(x)->babble--;} restore_flags(__spinflags);} while (0) 117#define spin_unlock(x) do {unsigned long __spinflags; save_flags(__spinflags); cli(); if (!(x)->lock&&(x)->babble) {printk("%s:%d: spin_unlock(%s:%p) not locked\n", __BASE_FILE__,__LINE__, (x)->module, (x));(x)->babble--;} (x)->lock = 0; restore_flags(__spinflags);} while (0) 118 119#endif /* DEBUG_SPINLOCKS */ 120 121#if (__GNUC__ > 2 || __GNUC_MINOR__ > 91) 122 typedef struct { } rwlock_t; 123 #define RW_LOCK_UNLOCKED (rwlock_t) { } 124#else 125 typedef struct { int gcc_is_buggy; } rwlock_t; 126 #define RW_LOCK_UNLOCKED (rwlock_t) { 0 } 127#endif 128 129#define rwlock_init(lock) do { } while(0) 130#define read_lock(lock) (void)(lock) /* Not "unused variable". */ 131#define read_unlock(lock) do { } while(0) 132#define write_lock(lock) (void)(lock) /* Not "unused variable". */ 133#define write_unlock(lock) do { } while(0) 134 135#endif /* !SMP */ 136 137/* "lock on reference count zero" */ 138#ifndef ATOMIC_DEC_AND_LOCK 139#include <asm/atomic.h> 140extern int atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock); 141#endif 142 143#ifdef CONFIG_SMP 144#include <linux/cache.h> 145 146typedef union { 147 spinlock_t lock; 148 char fill_up[(SMP_CACHE_BYTES)]; 149} spinlock_cacheline_t __attribute__ ((aligned(SMP_CACHE_BYTES))); 150 151#else /* SMP */ 152 153typedef struct { 154 spinlock_t lock; 155} spinlock_cacheline_t; 156 157 158#endif 159#endif /* __LINUX_SPINLOCK_H */ 160