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mconsole_kern.c

/*
 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org)
 * Copyright (C) 2001 - 2008 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include <linux/console.h>
#include <linux/ctype.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <linux/utsname.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
#include <asm/uaccess.h>

#include "init.h"
#include "irq_kern.h"
#include "irq_user.h"
#include "kern_util.h"
#include "mconsole.h"
#include "mconsole_kern.h"
#include "os.h"

static int do_unlink_socket(struct notifier_block *notifier,
                      unsigned long what, void *data)
{
      return mconsole_unlink_socket();
}


static struct notifier_block reboot_notifier = {
      .notifier_call          = do_unlink_socket,
      .priority         = 0,
};

/* Safe without explicit locking for now.  Tasklets provide their own
 * locking, and the interrupt handler is safe because it can't interrupt
 * itself and it can only happen on CPU 0.
 */

static LIST_HEAD(mc_requests);

static void mc_work_proc(struct work_struct *unused)
{
      struct mconsole_entry *req;
      unsigned long flags;

      while (!list_empty(&mc_requests)) {
            local_irq_save(flags);
            req = list_entry(mc_requests.next, struct mconsole_entry, list);
            list_del(&req->list);
            local_irq_restore(flags);
            req->request.cmd->handler(&req->request);
            kfree(req);
      }
}

static DECLARE_WORK(mconsole_work, mc_work_proc);

static irqreturn_t mconsole_interrupt(int irq, void *dev_id)
{
      /* long to avoid size mismatch warnings from gcc */
      long fd;
      struct mconsole_entry *new;
      static struct mc_request req; /* that's OK */

      fd = (long) dev_id;
      while (mconsole_get_request(fd, &req)) {
            if (req.cmd->context == MCONSOLE_INTR)
                  (*req.cmd->handler)(&req);
            else {
                  new = kmalloc(sizeof(*new), GFP_NOWAIT);
                  if (new == NULL)
                        mconsole_reply(&req, "Out of memory", 1, 0);
                  else {
                        new->request = req;
                        new->request.regs = get_irq_regs()->regs;
                        list_add(&new->list, &mc_requests);
                  }
            }
      }
      if (!list_empty(&mc_requests))
            schedule_work(&mconsole_work);
      reactivate_fd(fd, MCONSOLE_IRQ);
      return IRQ_HANDLED;
}

void mconsole_version(struct mc_request *req)
{
      char version[256];

      sprintf(version, "%s %s %s %s %s", utsname()->sysname,
            utsname()->nodename, utsname()->release, utsname()->version,
            utsname()->machine);
      mconsole_reply(req, version, 0, 0);
}

void mconsole_log(struct mc_request *req)
{
      int len;
      char *ptr = req->request.data;

      ptr += strlen("log ");

      len = req->len - (ptr - req->request.data);
      printk(KERN_WARNING "%.*s", len, ptr);
      mconsole_reply(req, "", 0, 0);
}

/* This is a more convoluted version of mconsole_proc, which has some stability
 * problems; however, we need it fixed, because it is expected that UML users
 * mount HPPFS instead of procfs on /proc. And we want mconsole_proc to still
 * show the real procfs content, not the ones from hppfs.*/
#if 0
void mconsole_proc(struct mc_request *req)
{
      struct nameidata nd;
      struct file_system_type *proc;
      struct super_block *super;
      struct file *file;
      int n, err;
      char *ptr = req->request.data, *buf;

      ptr += strlen("proc");
      while (isspace(*ptr)) ptr++;

      proc = get_fs_type("proc");
      if (proc == NULL) {
            mconsole_reply(req, "procfs not registered", 1, 0);
            goto out;
      }

      super = (*proc->get_sb)(proc, 0, NULL, NULL);
      put_filesystem(proc);
      if (super == NULL) {
            mconsole_reply(req, "Failed to get procfs superblock", 1, 0);
            goto out;
      }
      up_write(&super->s_umount);

      nd.path.dentry = super->s_root;
      nd.path.mnt = NULL;
      nd.flags = O_RDONLY + 1;
      nd.last_type = LAST_ROOT;

      /* START: it was experienced that the stability problems are closed
       * if commenting out these two calls + the below read cycle. To
       * make UML crash again, it was enough to readd either one.*/
      err = link_path_walk(ptr, &nd);
      if (err) {
            mconsole_reply(req, "Failed to look up file", 1, 0);
            goto out_kill;
      }

      file = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY);
      if (IS_ERR(file)) {
            mconsole_reply(req, "Failed to open file", 1, 0);
            goto out_kill;
      }
      /*END*/

      buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
      if (buf == NULL) {
            mconsole_reply(req, "Failed to allocate buffer", 1, 0);
            goto out_fput;
      }

      if ((file->f_op != NULL) && (file->f_op->read != NULL)) {
            do {
                  n = (*file->f_op->read)(file, buf, PAGE_SIZE - 1,
                                    &file->f_pos);
                  if (n >= 0) {
                        buf[n] = '\0';
                        mconsole_reply(req, buf, 0, (n > 0));
                  }
                  else {
                        mconsole_reply(req, "Read of file failed",
                                     1, 0);
                        goto out_free;
                  }
            } while (n > 0);
      }
      else mconsole_reply(req, "", 0, 0);

 out_free:
      kfree(buf);
 out_fput:
      fput(file);
 out_kill:
      deactivate_super(super);
 out: ;
}
#endif

void mconsole_proc(struct mc_request *req)
{
      char path[64];
      char *buf;
      int len;
      int fd;
      int first_chunk = 1;
      char *ptr = req->request.data;

      ptr += strlen("proc");
      while (isspace(*ptr))
            ptr++;
      snprintf(path, sizeof(path), "/proc/%s", ptr);

      fd = sys_open(path, 0, 0);
      if (fd < 0) {
            mconsole_reply(req, "Failed to open file", 1, 0);
            printk(KERN_ERR "open %s: %d\n",path,fd);
            goto out;
      }

      buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
      if (buf == NULL) {
            mconsole_reply(req, "Failed to allocate buffer", 1, 0);
            goto out_close;
      }

      for (;;) {
            len = sys_read(fd, buf, PAGE_SIZE-1);
            if (len < 0) {
                  mconsole_reply(req, "Read of file failed", 1, 0);
                  goto out_free;
            }
            /* Begin the file content on his own line. */
            if (first_chunk) {
                  mconsole_reply(req, "\n", 0, 1);
                  first_chunk = 0;
            }
            if (len == PAGE_SIZE-1) {
                  buf[len] = '\0';
                  mconsole_reply(req, buf, 0, 1);
            } else {
                  buf[len] = '\0';
                  mconsole_reply(req, buf, 0, 0);
                  break;
            }
      }

 out_free:
      kfree(buf);
 out_close:
      sys_close(fd);
 out:
      /* nothing */;
}

#define UML_MCONSOLE_HELPTEXT \
"Commands: \n\
    version - Get kernel version \n\
    help - Print this message \n\
    halt - Halt UML \n\
    reboot - Reboot UML \n\
    config <dev>=<config> - Add a new device to UML;  \n\
      same syntax as command line \n\
    config <dev> - Query the configuration of a device \n\
    remove <dev> - Remove a device from UML \n\
    sysrq <letter> - Performs the SysRq action controlled by the letter \n\
    cad - invoke the Ctrl-Alt-Del handler \n\
    stop - pause the UML; it will do nothing until it receives a 'go' \n\
    go - continue the UML after a 'stop' \n\
    log <string> - make UML enter <string> into the kernel log\n\
    proc <file> - returns the contents of the UML's /proc/<file>\n\
    stack <pid> - returns the stack of the specified pid\n\
"

void mconsole_help(struct mc_request *req)
{
      mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0);
}

void mconsole_halt(struct mc_request *req)
{
      mconsole_reply(req, "", 0, 0);
      machine_halt();
}

void mconsole_reboot(struct mc_request *req)
{
      mconsole_reply(req, "", 0, 0);
      machine_restart(NULL);
}

void mconsole_cad(struct mc_request *req)
{
      mconsole_reply(req, "", 0, 0);
      ctrl_alt_del();
}

void mconsole_go(struct mc_request *req)
{
      mconsole_reply(req, "Not stopped", 1, 0);
}

void mconsole_stop(struct mc_request *req)
{
      deactivate_fd(req->originating_fd, MCONSOLE_IRQ);
      os_set_fd_block(req->originating_fd, 1);
      mconsole_reply(req, "stopped", 0, 0);
      for (;;) {
            if (!mconsole_get_request(req->originating_fd, req))
                  continue;
            if (req->cmd->handler == mconsole_go)
                  break;
            if (req->cmd->handler == mconsole_stop) {
                  mconsole_reply(req, "Already stopped", 1, 0);
                  continue;
            }
            if (req->cmd->handler == mconsole_sysrq) {
                  struct pt_regs *old_regs;
                  old_regs = set_irq_regs((struct pt_regs *)&req->regs);
                  mconsole_sysrq(req);
                  set_irq_regs(old_regs);
                  continue;
            }
            (*req->cmd->handler)(req);
      }
      os_set_fd_block(req->originating_fd, 0);
      reactivate_fd(req->originating_fd, MCONSOLE_IRQ);
      mconsole_reply(req, "", 0, 0);
}

static DEFINE_SPINLOCK(mc_devices_lock);
static LIST_HEAD(mconsole_devices);

void mconsole_register_dev(struct mc_device *new)
{
      spin_lock(&mc_devices_lock);
      BUG_ON(!list_empty(&new->list));
      list_add(&new->list, &mconsole_devices);
      spin_unlock(&mc_devices_lock);
}

static struct mc_device *mconsole_find_dev(char *name)
{
      struct list_head *ele;
      struct mc_device *dev;

      list_for_each(ele, &mconsole_devices) {
            dev = list_entry(ele, struct mc_device, list);
            if (!strncmp(name, dev->name, strlen(dev->name)))
                  return dev;
      }
      return NULL;
}

#define UNPLUGGED_PER_PAGE \
      ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long))

struct unplugged_pages {
      struct list_head list;
      void *pages[UNPLUGGED_PER_PAGE];
};

static DEFINE_MUTEX(plug_mem_mutex);
static unsigned long long unplugged_pages_count = 0;
static LIST_HEAD(unplugged_pages);
static int unplug_index = UNPLUGGED_PER_PAGE;

static int mem_config(char *str, char **error_out)
{
      unsigned long long diff;
      int err = -EINVAL, i, add;
      char *ret;

      if (str[0] != '=') {
            *error_out = "Expected '=' after 'mem'";
            goto out;
      }

      str++;
      if (str[0] == '-')
            add = 0;
      else if (str[0] == '+') {
            add = 1;
      }
      else {
            *error_out = "Expected increment to start with '-' or '+'";
            goto out;
      }

      str++;
      diff = memparse(str, &ret);
      if (*ret != '\0') {
            *error_out = "Failed to parse memory increment";
            goto out;
      }

      diff /= PAGE_SIZE;

      mutex_lock(&plug_mem_mutex);
      for (i = 0; i < diff; i++) {
            struct unplugged_pages *unplugged;
            void *addr;

            if (add) {
                  if (list_empty(&unplugged_pages))
                        break;

                  unplugged = list_entry(unplugged_pages.next,
                                     struct unplugged_pages, list);
                  if (unplug_index > 0)
                        addr = unplugged->pages[--unplug_index];
                  else {
                        list_del(&unplugged->list);
                        addr = unplugged;
                        unplug_index = UNPLUGGED_PER_PAGE;
                  }

                  free_page((unsigned long) addr);
                  unplugged_pages_count--;
            }
            else {
                  struct page *page;

                  page = alloc_page(GFP_ATOMIC);
                  if (page == NULL)
                        break;

                  unplugged = page_address(page);
                  if (unplug_index == UNPLUGGED_PER_PAGE) {
                        list_add(&unplugged->list, &unplugged_pages);
                        unplug_index = 0;
                  }
                  else {
                        struct list_head *entry = unplugged_pages.next;
                        addr = unplugged;

                        unplugged = list_entry(entry,
                                           struct unplugged_pages,
                                           list);
                        err = os_drop_memory(addr, PAGE_SIZE);
                        if (err) {
                              printk(KERN_ERR "Failed to release "
                                     "memory - errno = %d\n", err);
                              *error_out = "Failed to release memory";
                              goto out_unlock;
                        }
                        unplugged->pages[unplug_index++] = addr;
                  }

                  unplugged_pages_count++;
            }
      }

      err = 0;
out_unlock:
      mutex_unlock(&plug_mem_mutex);
out:
      return err;
}

static int mem_get_config(char *name, char *str, int size, char **error_out)
{
      char buf[sizeof("18446744073709551615")];
      int len = 0;

      sprintf(buf, "%ld", uml_physmem);
      CONFIG_CHUNK(str, size, len, buf, 1);

      return len;
}

static int mem_id(char **str, int *start_out, int *end_out)
{
      *start_out = 0;
      *end_out = 0;

      return 0;
}

static int mem_remove(int n, char **error_out)
{
      *error_out = "Memory doesn't support the remove operation";
      return -EBUSY;
}

static struct mc_device mem_mc = {
      .list       = LIST_HEAD_INIT(mem_mc.list),
      .name       = "mem",
      .config           = mem_config,
      .get_config = mem_get_config,
      .id         = mem_id,
      .remove           = mem_remove,
};

static int __init mem_mc_init(void)
{
      if (can_drop_memory())
            mconsole_register_dev(&mem_mc);
      else printk(KERN_ERR "Can't release memory to the host - memory "
                "hotplug won't be supported\n");
      return 0;
}

__initcall(mem_mc_init);

#define CONFIG_BUF_SIZE 64

static void mconsole_get_config(int (*get_config)(char *, char *, int,
                                      char **),
                        struct mc_request *req, char *name)
{
      char default_buf[CONFIG_BUF_SIZE], *error, *buf;
      int n, size;

      if (get_config == NULL) {
            mconsole_reply(req, "No get_config routine defined", 1, 0);
            return;
      }

      error = NULL;
      size = ARRAY_SIZE(default_buf);
      buf = default_buf;

      while (1) {
            n = (*get_config)(name, buf, size, &error);
            if (error != NULL) {
                  mconsole_reply(req, error, 1, 0);
                  goto out;
            }

            if (n <= size) {
                  mconsole_reply(req, buf, 0, 0);
                  goto out;
            }

            if (buf != default_buf)
                  kfree(buf);

            size = n;
            buf = kmalloc(size, GFP_KERNEL);
            if (buf == NULL) {
                  mconsole_reply(req, "Failed to allocate buffer", 1, 0);
                  return;
            }
      }
 out:
      if (buf != default_buf)
            kfree(buf);
}

void mconsole_config(struct mc_request *req)
{
      struct mc_device *dev;
      char *ptr = req->request.data, *name, *error_string = "";
      int err;

      ptr += strlen("config");
      while (isspace(*ptr))
            ptr++;
      dev = mconsole_find_dev(ptr);
      if (dev == NULL) {
            mconsole_reply(req, "Bad configuration option", 1, 0);
            return;
      }

      name = &ptr[strlen(dev->name)];
      ptr = name;
      while ((*ptr != '=') && (*ptr != '\0'))
            ptr++;

      if (*ptr == '=') {
            err = (*dev->config)(name, &error_string);
            mconsole_reply(req, error_string, err, 0);
      }
      else mconsole_get_config(dev->get_config, req, name);
}

void mconsole_remove(struct mc_request *req)
{
      struct mc_device *dev;
      char *ptr = req->request.data, *err_msg = "";
      char error[256];
      int err, start, end, n;

      ptr += strlen("remove");
      while (isspace(*ptr)) ptr++;
      dev = mconsole_find_dev(ptr);
      if (dev == NULL) {
            mconsole_reply(req, "Bad remove option", 1, 0);
            return;
      }

      ptr = &ptr[strlen(dev->name)];

      err = 1;
      n = (*dev->id)(&ptr, &start, &end);
      if (n < 0) {
            err_msg = "Couldn't parse device number";
            goto out;
      }
      else if ((n < start) || (n > end)) {
            sprintf(error, "Invalid device number - must be between "
                  "%d and %d", start, end);
            err_msg = error;
            goto out;
      }

      err_msg = NULL;
      err = (*dev->remove)(n, &err_msg);
      switch(err) {
      case 0:
            err_msg = "";
            break;
      case -ENODEV:
            if (err_msg == NULL)
                  err_msg = "Device doesn't exist";
            break;
      case -EBUSY:
            if (err_msg == NULL)
                  err_msg = "Device is currently open";
            break;
      default:
            break;
      }
out:
      mconsole_reply(req, err_msg, err, 0);
}

struct mconsole_output {
      struct list_head list;
      struct mc_request *req;
};

static DEFINE_SPINLOCK(client_lock);
static LIST_HEAD(clients);
static char console_buf[MCONSOLE_MAX_DATA];

static void console_write(struct console *console, const char *string,
                    unsigned int len)
{
      struct list_head *ele;
      int n;

      if (list_empty(&clients))
            return;

      while (len > 0) {
            n = min((size_t) len, ARRAY_SIZE(console_buf));
            strncpy(console_buf, string, n);
            string += n;
            len -= n;

            list_for_each(ele, &clients) {
                  struct mconsole_output *entry;

                  entry = list_entry(ele, struct mconsole_output, list);
                  mconsole_reply_len(entry->req, console_buf, n, 0, 1);
            }
      }
}

static struct console mc_console = { .name      = "mc",
                             .write = console_write,
                             .flags = CON_ENABLED,
                             .index = -1 };

static int mc_add_console(void)
{
      register_console(&mc_console);
      return 0;
}

late_initcall(mc_add_console);

static void with_console(struct mc_request *req, void (*proc)(void *),
                   void *arg)
{
      struct mconsole_output entry;
      unsigned long flags;

      entry.req = req;
      spin_lock_irqsave(&client_lock, flags);
      list_add(&entry.list, &clients);
      spin_unlock_irqrestore(&client_lock, flags);

      (*proc)(arg);

      mconsole_reply_len(req, "", 0, 0, 0);

      spin_lock_irqsave(&client_lock, flags);
      list_del(&entry.list);
      spin_unlock_irqrestore(&client_lock, flags);
}

#ifdef CONFIG_MAGIC_SYSRQ

#include <linux/sysrq.h>

static void sysrq_proc(void *arg)
{
      char *op = arg;
      handle_sysrq(*op, NULL);
}

void mconsole_sysrq(struct mc_request *req)
{
      char *ptr = req->request.data;

      ptr += strlen("sysrq");
      while (isspace(*ptr)) ptr++;

      /*
       * With 'b', the system will shut down without a chance to reply,
       * so in this case, we reply first.
       */
      if (*ptr == 'b')
            mconsole_reply(req, "", 0, 0);

      with_console(req, sysrq_proc, ptr);
}
#else
void mconsole_sysrq(struct mc_request *req)
{
      mconsole_reply(req, "Sysrq not compiled in", 1, 0);
}
#endif

static void stack_proc(void *arg)
{
      struct task_struct *from = current, *to = arg;

      to->thread.saved_task = from;
      switch_to(from, to, from);
}

/*
 * Mconsole stack trace
 *  Added by Allan Graves, Jeff Dike
 *  Dumps a stacks registers to the linux console.
 *  Usage stack <pid>.
 */
void mconsole_stack(struct mc_request *req)
{
      char *ptr = req->request.data;
      int pid_requested= -1;
      struct task_struct *to = NULL;

      /*
       * Would be nice:
       * 1) Send showregs output to mconsole.
       * 2) Add a way to stack dump all pids.
       */

      ptr += strlen("stack");
      while (isspace(*ptr))
            ptr++;

      /*
       * Should really check for multiple pids or reject bad args here
       */
      /* What do the arguments in mconsole_reply mean? */
      if (sscanf(ptr, "%d", &pid_requested) == 0) {
            mconsole_reply(req, "Please specify a pid", 1, 0);
            return;
      }

      to = find_task_by_pid_ns(pid_requested, &init_pid_ns);
      if ((to == NULL) || (pid_requested == 0)) {
            mconsole_reply(req, "Couldn't find that pid", 1, 0);
            return;
      }
      with_console(req, stack_proc, to);
}

/*
 * Changed by mconsole_setup, which is __setup, and called before SMP is
 * active.
 */
static char *notify_socket = NULL;

static int __init mconsole_init(void)
{
      /* long to avoid size mismatch warnings from gcc */
      long sock;
      int err;
      char file[256];

      if (umid_file_name("mconsole", file, sizeof(file)))
            return -1;
      snprintf(mconsole_socket_name, sizeof(file), "%s", file);

      sock = os_create_unix_socket(file, sizeof(file), 1);
      if (sock < 0) {
            printk(KERN_ERR "Failed to initialize management console\n");
            return 1;
      }
      if (os_set_fd_block(sock, 0))
            goto out;

      register_reboot_notifier(&reboot_notifier);

      err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt,
                       IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM,
                       "mconsole", (void *)sock);
      if (err) {
            printk(KERN_ERR "Failed to get IRQ for management console\n");
            goto out;
      }

      if (notify_socket != NULL) {
            notify_socket = kstrdup(notify_socket, GFP_KERNEL);
            if (notify_socket != NULL)
                  mconsole_notify(notify_socket, MCONSOLE_SOCKET,
                              mconsole_socket_name,
                              strlen(mconsole_socket_name) + 1);
            else printk(KERN_ERR "mconsole_setup failed to strdup "
                      "string\n");
      }

      printk(KERN_INFO "mconsole (version %d) initialized on %s\n",
             MCONSOLE_VERSION, mconsole_socket_name);
      return 0;

 out:
      os_close_file(sock);
      return 1;
}

__initcall(mconsole_init);

static int write_proc_mconsole(struct file *file, const char __user *buffer,
                         unsigned long count, void *data)
{
      char *buf;

      buf = kmalloc(count + 1, GFP_KERNEL);
      if (buf == NULL)
            return -ENOMEM;

      if (copy_from_user(buf, buffer, count)) {
            count = -EFAULT;
            goto out;
      }

      buf[count] = '\0';

      mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count);
 out:
      kfree(buf);
      return count;
}

static int create_proc_mconsole(void)
{
      struct proc_dir_entry *ent;

      if (notify_socket == NULL)
            return 0;

      ent = create_proc_entry("mconsole", S_IFREG | 0200, NULL);
      if (ent == NULL) {
            printk(KERN_INFO "create_proc_mconsole : create_proc_entry "
                   "failed\n");
            return 0;
      }

      ent->read_proc = NULL;
      ent->write_proc = write_proc_mconsole;
      return 0;
}

static DEFINE_SPINLOCK(notify_spinlock);

void lock_notify(void)
{
      spin_lock(&notify_spinlock);
}

void unlock_notify(void)
{
      spin_unlock(&notify_spinlock);
}

__initcall(create_proc_mconsole);

#define NOTIFY "notify:"

static int mconsole_setup(char *str)
{
      if (!strncmp(str, NOTIFY, strlen(NOTIFY))) {
            str += strlen(NOTIFY);
            notify_socket = str;
      }
      else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str);
      return 1;
}

__setup("mconsole=", mconsole_setup);

__uml_help(mconsole_setup,
"mconsole=notify:<socket>\n"
"    Requests that the mconsole driver send a message to the named Unix\n"
"    socket containing the name of the mconsole socket.  This also serves\n"
"    to notify outside processes when UML has booted far enough to respond\n"
"    to mconsole requests.\n\n"
);

static int notify_panic(struct notifier_block *self, unsigned long unused1,
                  void *ptr)
{
      char *message = ptr;

      if (notify_socket == NULL)
            return 0;

      mconsole_notify(notify_socket, MCONSOLE_PANIC, message,
                  strlen(message) + 1);
      return 0;
}

static struct notifier_block panic_exit_notifier = {
      .notifier_call          = notify_panic,
      .next                   = NULL,
      .priority         = 1
};

static int add_notifier(void)
{
      atomic_notifier_chain_register(&panic_notifier_list,
                  &panic_exit_notifier);
      return 0;
}

__initcall(add_notifier);

char *mconsole_notify_socket(void)
{
      return notify_socket;
}

EXPORT_SYMBOL(mconsole_notify_socket);

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