#include <linux/debugfs.h> static struct dentry *ras_debugfs_dir; static atomic_t trace_count = ATOMIC_INIT(0); int ras_userspace_consumers(void){	return atomic_read(&trace_count);}EXPORT_SYMBOL_GPL(ras_userspace_consumers); static int trace_show(struct seq_file *m, void *v){	return atomic_read(&trace_count);} static int trace_open(struct inode *inode, struct file *file){	atomic_inc(&trace_count);	return single_open(file, trace_show, NULL);} static int trace_release(struct inode *inode, struct file *file){	atomic_dec(&trace_count);	return single_release(inode, file);} static const struct file_operations trace_fops = {	.open    = trace_open,	.read    = seq_read,	.llseek  = seq_lseek,	.release = trace_release,}; int __init ras_add_daemon_trace(void){	struct dentry *fentry; 	if (!ras_debugfs_dir)		return -ENOENT; 	fentry = debugfs_create_file("daemon_active", S_IRUSR, ras_debugfs_dir,				     NULL, &trace_fops);	if (!fentry)		return -ENODEV; 	return 0; } void __init ras_debugfs_init(void){	ras_debugfs_dir = debugfs_create_dir("ras", NULL);}