lttng-statedump-impl.c

   1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
   2  *
   3  * lttng-statedump.c
   4  *
   5  * Linux Trace Toolkit Next Generation Kernel State Dump
   6  *
   7  * Copyright 2005 Jean-Hugues Deschenes <jean-hugues.deschenes@polymtl.ca>
   8  * Copyright 2006-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   9  *
  10  * Changes:
  11  *      Eric Clement:                   Add listing of network IP interface
  12  *      2006, 2007 Mathieu Desnoyers    Fix kernel threads
  13  *                                      Various updates
  14  */
  15
  16 #include <linux/init.h>
  17 #include <linux/module.h>
  18 #include <linux/netlink.h>
  19 #include <linux/inet.h>
  20 #include <linux/ip.h>
  21 #include <linux/kthread.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/file.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/irqnr.h>
  26 #include <linux/cpu.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/inetdevice.h>
  29 #include <linux/sched.h>
  30 #include <linux/mm.h>
  31 #include <linux/swap.h>
  32 #include <linux/wait.h>
  33 #include <linux/mutex.h>
  34 #include <linux/device.h>
  35
  36 #include <lttng-events.h>
  37 #include <lttng-tracer.h>
  38 #include <wrapper/irqdesc.h>
  39 #include <wrapper/fdtable.h>
  40 #include <wrapper/namespace.h>
  41 #include <wrapper/irq.h>
  42 #include <wrapper/tracepoint.h>
  43 #include <wrapper/genhd.h>
  44 #include <wrapper/file.h>
  45 #include <wrapper/fdtable.h>
  46
  47 #ifdef CONFIG_LTTNG_HAS_LIST_IRQ
  48 #include <linux/irq.h>
  49 #endif
  50
  51 /* Define the tracepoints, but do not build the probes */
  52 #define CREATE_TRACE_POINTS
  53 #define TRACE_INCLUDE_PATH instrumentation/events/lttng-module
  54 #define TRACE_INCLUDE_FILE lttng-statedump
  55 #define LTTNG_INSTRUMENTATION
  56 #include <instrumentation/events/lttng-module/lttng-statedump.h>
  57
  58 DEFINE_TRACE(lttng_statedump_block_device);
  59 DEFINE_TRACE(lttng_statedump_end);
  60 DEFINE_TRACE(lttng_statedump_interrupt);
  61 DEFINE_TRACE(lttng_statedump_file_descriptor);
  62 DEFINE_TRACE(lttng_statedump_start);
  63 DEFINE_TRACE(lttng_statedump_process_state);
  64 DEFINE_TRACE(lttng_statedump_process_pid_ns);
  65 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0))
  66 DEFINE_TRACE(lttng_statedump_process_cgroup_ns);
  67 #endif
  68 DEFINE_TRACE(lttng_statedump_process_ipc_ns);
  69 #ifndef LTTNG_MNT_NS_MISSING_HEADER
  70 DEFINE_TRACE(lttng_statedump_process_mnt_ns);
  71 #endif
  72 DEFINE_TRACE(lttng_statedump_process_net_ns);
  73 DEFINE_TRACE(lttng_statedump_process_user_ns);
  74 DEFINE_TRACE(lttng_statedump_process_uts_ns);
  75 DEFINE_TRACE(lttng_statedump_network_interface);
  76 #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY
  77 DEFINE_TRACE(lttng_statedump_cpu_topology);
  78 #endif
  79
  80 struct lttng_fd_ctx {
  81         char *page;
  82         struct lttng_session *session;
  83         struct task_struct *p;
  84         struct files_struct *files;
  85 };
  86
  87 /*
  88  * Protected by the trace lock.
  89  */
  90 static struct delayed_work cpu_work[NR_CPUS];
  91 static DECLARE_WAIT_QUEUE_HEAD(statedump_wq);
  92 static atomic_t kernel_threads_to_run;
  93
  94 enum lttng_thread_type {
  95         LTTNG_USER_THREAD = 0,
  96         LTTNG_KERNEL_THREAD = 1,
  97 };
  98
  99 enum lttng_execution_mode {
 100         LTTNG_USER_MODE = 0,
 101         LTTNG_SYSCALL = 1,
 102         LTTNG_TRAP = 2,
 103         LTTNG_IRQ = 3,
 104         LTTNG_SOFTIRQ = 4,
 105         LTTNG_MODE_UNKNOWN = 5,
 106 };
 107
 108 enum lttng_execution_submode {
 109         LTTNG_NONE = 0,
 110         LTTNG_UNKNOWN = 1,
 111 };
 112
 113 enum lttng_process_status {
 114         LTTNG_UNNAMED = 0,
 115         LTTNG_WAIT_FORK = 1,
 116         LTTNG_WAIT_CPU = 2,
 117         LTTNG_EXIT = 3,
 118         LTTNG_ZOMBIE = 4,
 119         LTTNG_WAIT = 5,
 120         LTTNG_RUN = 6,
 121         LTTNG_DEAD = 7,
 122 };
 123
 124 static
 125 int lttng_enumerate_block_devices(struct lttng_session *session)
 126 {
 127         struct class *ptr_block_class;
 128         struct device_type *ptr_disk_type;
 129         struct class_dev_iter iter;
 130         struct device *dev;
 131
 132         ptr_block_class = wrapper_get_block_class();
 133         if (!ptr_block_class)
 134                 return -ENOSYS;
 135         ptr_disk_type = wrapper_get_disk_type();
 136         if (!ptr_disk_type) {
 137                 return -ENOSYS;
 138         }
 139         class_dev_iter_init(&iter, ptr_block_class, NULL, ptr_disk_type);
 140         while ((dev = class_dev_iter_next(&iter))) {
 141                 struct disk_part_iter piter;
 142                 struct gendisk *disk = dev_to_disk(dev);
 143                 struct hd_struct *part;
 144
 145                 /*
 146                  * Don't show empty devices or things that have been
 147                  * suppressed
 148                  */
 149                 if (get_capacity(disk) == 0 ||
 150                     (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO))
 151                         continue;
 152
 153                 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
 154                 while ((part = disk_part_iter_next(&piter))) {
 155                         char name_buf[BDEVNAME_SIZE];
 156                         char *p;
 157
 158                         p = wrapper_disk_name(disk, part->partno, name_buf);
 159                         if (!p) {
 160                                 disk_part_iter_exit(&piter);
 161                                 class_dev_iter_exit(&iter);
 162                                 return -ENOSYS;
 163                         }
 164                         trace_lttng_statedump_block_device(session,
 165                                         part_devt(part), name_buf);
 166                 }
 167                 disk_part_iter_exit(&piter);
 168         }
 169         class_dev_iter_exit(&iter);
 170         return 0;
 171 }
 172
 173 #ifdef CONFIG_INET
 174
 175 static
 176 void lttng_enumerate_device(struct lttng_session *session,
 177                 struct net_device *dev)
 178 {
 179         struct in_device *in_dev;
 180         struct in_ifaddr *ifa;
 181
 182         if (dev->flags & IFF_UP) {
 183                 in_dev = in_dev_get(dev);
 184                 if (in_dev) {
 185                         for (ifa = in_dev->ifa_list; ifa != NULL;
 186                              ifa = ifa->ifa_next) {
 187                                 trace_lttng_statedump_network_interface(
 188                                         session, dev, ifa);
 189                         }
 190                         in_dev_put(in_dev);
 191                 }
 192         } else {
 193                 trace_lttng_statedump_network_interface(
 194                         session, dev, NULL);
 195         }
 196 }
 197
 198 static
 199 int lttng_enumerate_network_ip_interface(struct lttng_session *session)
 200 {
 201         struct net_device *dev;
 202
 203         read_lock(&dev_base_lock);
 204         for_each_netdev(&init_net, dev)
 205                 lttng_enumerate_device(session, dev);
 206         read_unlock(&dev_base_lock);
 207
 208         return 0;
 209 }
 210 #else /* CONFIG_INET */
 211 static inline
 212 int lttng_enumerate_network_ip_interface(struct lttng_session *session)
 213 {
 214         return 0;
 215 }
 216 #endif /* CONFIG_INET */
 217
 218 static
 219 int lttng_dump_one_fd(const void *p, struct file *file, unsigned int fd)
 220 {
 221         const struct lttng_fd_ctx *ctx = p;
 222         const char *s = d_path(&file->f_path, ctx->page, PAGE_SIZE);
 223         unsigned int flags = file->f_flags;
 224         struct fdtable *fdt;
 225
 226         /*
 227          * We don't expose kernel internal flags, only userspace-visible
 228          * flags.
 229          */
 230         flags &= ~FMODE_NONOTIFY;
 231         fdt = files_fdtable(ctx->files);
 232         /*
 233          * We need to check here again whether fd is within the fdt
 234          * max_fds range, because we might be seeing a different
 235          * files_fdtable() than iterate_fd(), assuming only RCU is
 236          * protecting the read. In reality, iterate_fd() holds
 237          * file_lock, which should ensure the fdt does not change while
 238          * the lock is taken, but we are not aware whether this is
 239          * guaranteed or not, so play safe.
 240          */
 241         if (fd < fdt->max_fds && lttng_close_on_exec(fd, fdt))
 242                 flags |= O_CLOEXEC;
 243         if (IS_ERR(s)) {
 244                 struct dentry *dentry = file->f_path.dentry;
 245
 246                 /* Make sure we give at least some info */
 247                 spin_lock(&dentry->d_lock);
 248                 trace_lttng_statedump_file_descriptor(ctx->session, ctx->p, fd,
 249                         dentry->d_name.name, flags, file->f_mode);
 250                 spin_unlock(&dentry->d_lock);
 251                 goto end;
 252         }
 253         trace_lttng_statedump_file_descriptor(ctx->session, ctx->p, fd, s,
 254                 flags, file->f_mode);
 255 end:
 256         return 0;
 257 }
 258
 259 static
 260 void lttng_enumerate_task_fd(struct lttng_session *session,
 261                 struct task_struct *p, char *tmp)
 262 {
 263         struct lttng_fd_ctx ctx = { .page = tmp, .session = session, .p = p };
 264         struct files_struct *files;
 265
 266         task_lock(p);
 267         files = p->files;
 268         if (!files)
 269                 goto end;
 270         ctx.files = files;
 271         lttng_iterate_fd(files, 0, lttng_dump_one_fd, &ctx);
 272 end:
 273         task_unlock(p);
 274 }
 275
 276 static
 277 int lttng_enumerate_file_descriptors(struct lttng_session *session)
 278 {
 279         struct task_struct *p;
 280         char *tmp;
 281
 282         tmp = (char *) __get_free_page(GFP_KERNEL);
 283         if (!tmp)
 284                 return -ENOMEM;
 285
 286         /* Enumerate active file descriptors */
 287         rcu_read_lock();
 288         for_each_process(p)
 289                 lttng_enumerate_task_fd(session, p, tmp);
 290         rcu_read_unlock();
 291         free_page((unsigned long) tmp);
 292         return 0;
 293 }
 294
 295 #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY
 296 static
 297 int lttng_enumerate_cpu_topology(struct lttng_session *session)
 298 {
 299         int cpu;
 300         const cpumask_t *cpumask = cpu_possible_mask;
 301
 302         for (cpu = cpumask_first(cpumask); cpu < nr_cpu_ids;
 303                         cpu = cpumask_next(cpu, cpumask)) {
 304                 trace_lttng_statedump_cpu_topology(session, &cpu_data(cpu));
 305         }
 306
 307         return 0;
 308 }
 309 #else
 310 static
 311 int lttng_enumerate_cpu_topology(struct lttng_session *session)
 312 {
 313         return 0;
 314 }
 315 #endif
 316
 317 #if 0
 318 /*
 319  * FIXME: we cannot take a mmap_sem while in a RCU read-side critical section
 320  * (scheduling in atomic). Normally, the tasklist lock protects this kind of
 321  * iteration, but it is not exported to modules.
 322  */
 323 static
 324 void lttng_enumerate_task_vm_maps(struct lttng_session *session,
 325                 struct task_struct *p)
 326 {
 327         struct mm_struct *mm;
 328         struct vm_area_struct *map;
 329         unsigned long ino;
 330
 331         /* get_task_mm does a task_lock... */
 332         mm = get_task_mm(p);
 333         if (!mm)
 334                 return;
 335
 336         map = mm->mmap;
 337         if (map) {
 338                 down_read(&mm->mmap_sem);
 339                 while (map) {
 340                         if (map->vm_file)
 341                                 ino = map->vm_file->lttng_f_dentry->d_inode->i_ino;
 342                         else
 343                                 ino = 0;
 344                         trace_lttng_statedump_vm_map(session, p, map, ino);
 345                         map = map->vm_next;
 346                 }
 347                 up_read(&mm->mmap_sem);
 348         }
 349         mmput(mm);
 350 }
 351
 352 static
 353 int lttng_enumerate_vm_maps(struct lttng_session *session)
 354 {
 355         struct task_struct *p;
 356
 357         rcu_read_lock();
 358         for_each_process(p)
 359                 lttng_enumerate_task_vm_maps(session, p);
 360         rcu_read_unlock();
 361         return 0;
 362 }
 363 #endif
 364
 365 #ifdef CONFIG_LTTNG_HAS_LIST_IRQ
 366
 367 static
 368 int lttng_list_interrupts(struct lttng_session *session)
 369 {
 370         unsigned int irq;
 371         unsigned long flags = 0;
 372         struct irq_desc *desc;
 373
 374 #define irq_to_desc     wrapper_irq_to_desc
 375         /* needs irq_desc */
 376         for_each_irq_desc(irq, desc) {
 377                 struct irqaction *action;
 378                 const char *irq_chip_name =
 379                         irq_desc_get_chip(desc)->name ? : "unnamed_irq_chip";
 380
 381                 local_irq_save(flags);
 382                 raw_spin_lock(&desc->lock);
 383                 for (action = desc->action; action; action = action->next) {
 384                         trace_lttng_statedump_interrupt(session,
 385                                 irq, irq_chip_name, action);
 386                 }
 387                 raw_spin_unlock(&desc->lock);
 388                 local_irq_restore(flags);
 389         }
 390         return 0;
 391 #undef irq_to_desc
 392 }
 393 #else
 394 static inline
 395 int lttng_list_interrupts(struct lttng_session *session)
 396 {
 397         return 0;
 398 }
 399 #endif
 400
 401 /*
 402  * Statedump the task's namespaces using the proc filesystem inode number as
 403  * the unique identifier. The user and pid ns are nested and will be dumped
 404  * recursively.
 405  *
 406  * Called with task lock held.
 407  */
 408 static
 409 void lttng_statedump_process_ns(struct lttng_session *session,
 410                 struct task_struct *p,
 411                 enum lttng_thread_type type,
 412                 enum lttng_execution_mode mode,
 413                 enum lttng_execution_submode submode,
 414                 enum lttng_process_status status)
 415 {
 416         struct nsproxy *proxy;
 417         struct pid_namespace *pid_ns;
 418         struct user_namespace *user_ns;
 419
 420         /*
 421          * The pid and user namespaces are special, they are nested and
 422          * accessed with specific functions instead of the nsproxy struct
 423          * like the other namespaces.
 424          */
 425         pid_ns = task_active_pid_ns(p);
 426         do {
 427                 trace_lttng_statedump_process_pid_ns(session, p, pid_ns);
 428                 pid_ns = pid_ns ? pid_ns->parent : NULL;
 429         } while (pid_ns);
 430
 431
 432         user_ns = task_cred_xxx(p, user_ns);
 433         do {
 434                 trace_lttng_statedump_process_user_ns(session, p, user_ns);
 435                 /*
 436                  * trace_lttng_statedump_process_user_ns() internally
 437                  * checks whether user_ns is NULL. While this does not
 438                  * appear to be a possible return value for
 439                  * task_cred_xxx(), err on the safe side and check
 440                  * for NULL here as well to be consistent with the
 441                  * paranoid behavior of
 442                  * trace_lttng_statedump_process_user_ns().
 443                  */
 444                 user_ns = user_ns ? user_ns->lttng_user_ns_parent : NULL;
 445         } while (user_ns);
 446
 447         /*
 448          * Back and forth on locking strategy within Linux upstream for nsproxy.
 449          * See Linux upstream commit 728dba3a39c66b3d8ac889ddbe38b5b1c264aec3
 450          * "namespaces: Use task_lock and not rcu to protect nsproxy"
 451          * for details.
 452          */
 453 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0) || \
 454                 LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0) || \
 455                 LTTNG_UBUNTU_KERNEL_RANGE(3,16,1,11, 3,17,0,0) || \
 456                 LTTNG_RHEL_KERNEL_RANGE(3,10,0,229,13,0, 3,11,0,0,0,0))
 457         proxy = p->nsproxy;
 458 #else
 459         rcu_read_lock();
 460         proxy = task_nsproxy(p);
 461 #endif
 462         if (proxy) {
 463 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0))
 464                 trace_lttng_statedump_process_cgroup_ns(session, p, proxy->cgroup_ns);
 465 #endif
 466                 trace_lttng_statedump_process_ipc_ns(session, p, proxy->ipc_ns);
 467 #ifndef LTTNG_MNT_NS_MISSING_HEADER
 468                 trace_lttng_statedump_process_mnt_ns(session, p, proxy->mnt_ns);
 469 #endif
 470                 trace_lttng_statedump_process_net_ns(session, p, proxy->net_ns);
 471                 trace_lttng_statedump_process_uts_ns(session, p, proxy->uts_ns);
 472         }
 473 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0) || \
 474                 LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0) || \
 475                 LTTNG_UBUNTU_KERNEL_RANGE(3,16,1,11, 3,17,0,0) || \
 476                 LTTNG_RHEL_KERNEL_RANGE(3,10,0,229,13,0, 3,11,0,0,0,0))
 477         /* (nothing) */
 478 #else
 479         rcu_read_unlock();
 480 #endif
 481 }
 482
 483 static
 484 int lttng_enumerate_process_states(struct lttng_session *session)
 485 {
 486         struct task_struct *g, *p;
 487
 488         rcu_read_lock();
 489         for_each_process(g) {
 490                 p = g;
 491                 do {
 492                         enum lttng_execution_mode mode =
 493                                 LTTNG_MODE_UNKNOWN;
 494                         enum lttng_execution_submode submode =
 495                                 LTTNG_UNKNOWN;
 496                         enum lttng_process_status status;
 497                         enum lttng_thread_type type;
 498
 499                         task_lock(p);
 500                         if (p->exit_state == EXIT_ZOMBIE)
 501                                 status = LTTNG_ZOMBIE;
 502                         else if (p->exit_state == EXIT_DEAD)
 503                                 status = LTTNG_DEAD;
 504                         else if (p->state == TASK_RUNNING) {
 505                                 /* Is this a forked child that has not run yet? */
 506                                 if (list_empty(&p->rt.run_list))
 507                                         status = LTTNG_WAIT_FORK;
 508                                 else
 509                                         /*
 510                                          * All tasks are considered as wait_cpu;
 511                                          * the viewer will sort out if the task
 512                                          * was really running at this time.
 513                                          */
 514                                         status = LTTNG_WAIT_CPU;
 515                         } else if (p->state &
 516                                 (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)) {
 517                                 /* Task is waiting for something to complete */
 518                                 status = LTTNG_WAIT;
 519                         } else
 520                                 status = LTTNG_UNNAMED;
 521                         submode = LTTNG_NONE;
 522
 523                         /*
 524                          * Verification of t->mm is to filter out kernel
 525                          * threads; Viewer will further filter out if a
 526                          * user-space thread was in syscall mode or not.
 527                          */
 528                         if (p->mm)
 529                                 type = LTTNG_USER_THREAD;
 530                         else
 531                                 type = LTTNG_KERNEL_THREAD;
 532
 533                         trace_lttng_statedump_process_state(session,
 534                                 p, type, mode, submode, status);
 535                         lttng_statedump_process_ns(session,
 536                                 p, type, mode, submode, status);
 537                         task_unlock(p);
 538                 } while_each_thread(g, p);
 539         }
 540         rcu_read_unlock();
 541
 542         return 0;
 543 }
 544
 545 static
 546 void lttng_statedump_work_func(struct work_struct *work)
 547 {
 548         if (atomic_dec_and_test(&kernel_threads_to_run))
 549                 /* If we are the last thread, wake up do_lttng_statedump */
 550                 wake_up(&statedump_wq);
 551 }
 552
 553 static
 554 int do_lttng_statedump(struct lttng_session *session)
 555 {
 556         int cpu, ret;
 557
 558         trace_lttng_statedump_start(session);
 559         ret = lttng_enumerate_process_states(session);
 560         if (ret)
 561                 return ret;
 562         ret = lttng_enumerate_file_descriptors(session);
 563         if (ret)
 564                 return ret;
 565         /*
 566          * FIXME
 567          * ret = lttng_enumerate_vm_maps(session);
 568          * if (ret)
 569          *      return ret;
 570          */
 571         ret = lttng_list_interrupts(session);
 572         if (ret)
 573                 return ret;
 574         ret = lttng_enumerate_network_ip_interface(session);
 575         if (ret)
 576                 return ret;
 577         ret = lttng_enumerate_block_devices(session);
 578         switch (ret) {
 579         case 0:
 580                 break;
 581         case -ENOSYS:
 582                 printk(KERN_WARNING "LTTng: block device enumeration is not supported by kernel\n");
 583                 break;
 584         default:
 585                 return ret;
 586         }
 587         ret = lttng_enumerate_cpu_topology(session);
 588         if (ret)
 589                 return ret;
 590
 591         /* TODO lttng_dump_idt_table(session); */
 592         /* TODO lttng_dump_softirq_vec(session); */
 593         /* TODO lttng_list_modules(session); */
 594         /* TODO lttng_dump_swap_files(session); */
 595
 596         /*
 597          * Fire off a work queue on each CPU. Their sole purpose in life
 598          * is to guarantee that each CPU has been in a state where is was in
 599          * syscall mode (i.e. not in a trap, an IRQ or a soft IRQ).
 600          */
 601         get_online_cpus();
 602         atomic_set(&kernel_threads_to_run, num_online_cpus());
 603         for_each_online_cpu(cpu) {
 604                 INIT_DELAYED_WORK(&cpu_work[cpu], lttng_statedump_work_func);
 605                 schedule_delayed_work_on(cpu, &cpu_work[cpu], 0);
 606         }
 607         /* Wait for all threads to run */
 608         __wait_event(statedump_wq, (atomic_read(&kernel_threads_to_run) == 0));
 609         put_online_cpus();
 610         /* Our work is done */
 611         trace_lttng_statedump_end(session);
 612         return 0;
 613 }
 614
 615 /*
 616  * Called with session mutex held.
 617  */
 618 int lttng_statedump_start(struct lttng_session *session)
 619 {
 620         return do_lttng_statedump(session);
 621 }
 622 EXPORT_SYMBOL_GPL(lttng_statedump_start);
 623
 624 static
 625 int __init lttng_statedump_init(void)
 626 {
 627         /*
 628          * Allow module to load even if the fixup cannot be done. This
 629          * will allow seemless transition when the underlying issue fix
 630          * is merged into the Linux kernel, and when tracepoint.c
 631          * "tracepoint_module_notify" is turned into a static function.
 632          */
 633         (void) wrapper_lttng_fixup_sig(THIS_MODULE);
 634         return 0;
 635 }
 636
 637 module_init(lttng_statedump_init);
 638
 639 static
 640 void __exit lttng_statedump_exit(void)
 641 {
 642 }
 643
 644 module_exit(lttng_statedump_exit);
 645
 646 MODULE_LICENSE("GPL and additional rights");
 647 MODULE_AUTHOR("Jean-Hugues Deschenes");
 648 MODULE_DESCRIPTION("LTTng statedump provider");
 649 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
 650         __stringify(LTTNG_MODULES_MINOR_VERSION) "."
 651         __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
 652         LTTNG_MODULES_EXTRAVERSION);