/* See include/linux/lglock.h for description */#include <linux/module.h>#include <linux/lglock.h>#include <linux/cpu.h>#include <linux/string.h> /* * Note there is no uninit, so lglocks cannot be defined in * modules (but it's fine to use them from there) * Could be added though, just undo lg_lock_init */ void lg_lock_init(struct lglock *lg, char *name){	LOCKDEP_INIT_MAP(&lg->lock_dep_map, name, &lg->lock_key, 0);}EXPORT_SYMBOL(lg_lock_init); void lg_local_lock(struct lglock *lg){	arch_spinlock_t *lock; 	preempt_disable();	rwlock_acquire_read(&lg->lock_dep_map, 0, 0, _RET_IP_);	lock = this_cpu_ptr(lg->lock);	arch_spin_lock(lock);}EXPORT_SYMBOL(lg_local_lock); void lg_local_unlock(struct lglock *lg){	arch_spinlock_t *lock; 	rwlock_release(&lg->lock_dep_map, 1, _RET_IP_);	lock = this_cpu_ptr(lg->lock);	arch_spin_unlock(lock);	preempt_enable();}EXPORT_SYMBOL(lg_local_unlock); void lg_local_lock_cpu(struct lglock *lg, int cpu){	arch_spinlock_t *lock; 	preempt_disable();	rwlock_acquire_read(&lg->lock_dep_map, 0, 0, _RET_IP_);	lock = per_cpu_ptr(lg->lock, cpu);	arch_spin_lock(lock);}EXPORT_SYMBOL(lg_local_lock_cpu); void lg_local_unlock_cpu(struct lglock *lg, int cpu){	arch_spinlock_t *lock; 	rwlock_release(&lg->lock_dep_map, 1, _RET_IP_);	lock = per_cpu_ptr(lg->lock, cpu);	arch_spin_unlock(lock);	preempt_enable();}EXPORT_SYMBOL(lg_local_unlock_cpu); void lg_global_lock(struct lglock *lg){	int i; 	preempt_disable();	rwlock_acquire(&lg->lock_dep_map, 0, 0, _RET_IP_);	for_each_possible_cpu(i) {		arch_spinlock_t *lock;		lock = per_cpu_ptr(lg->lock, i);		arch_spin_lock(lock);	}}EXPORT_SYMBOL(lg_global_lock); void lg_global_unlock(struct lglock *lg){	int i; 	rwlock_release(&lg->lock_dep_map, 1, _RET_IP_);	for_each_possible_cpu(i) {		arch_spinlock_t *lock;		lock = per_cpu_ptr(lg->lock, i);		arch_spin_unlock(lock);	}	preempt_enable();}EXPORT_SYMBOL(lg_global_unlock);