#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); }