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rv: Merge struct rv_monitor_def into struct rv_monitor

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Each struct rv_monitor has a unique struct rv_monitor_def associated with
it. struct rv_monitor is statically allocated, while struct rv_monitor_def
is dynamically allocated.

This makes the code more complicated than it should be:

  - Lookup is required to get the associated rv_monitor_def from rv_monitor

  - Dynamic memory allocation is required for rv_monitor_def. This is
    harder to get right compared to static memory. For instance, there is
    an existing mistake: rv_unregister_monitor() does not free the memory
    allocated by rv_register_monitor(). This is fortunately not a real
    memory leak problem, as rv_unregister_monitor() is never called.

Simplify and merge rv_monitor_def into rv_monitor.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/194449c00f87945c207aab4c96920c75796a4f53.1753378331.git.namcao@linutronix.de
Reviewed-by: Gabriele Monaco <gmonaco@redhat.com>
Signed-off-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Nam Cao 2025-07-24 19:33:27 +02:00 committed by Steven Rostedt (Google)
parent b0c08dd534
commit 24cbfe18d5
4 changed files with 140 additions and 168 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
include/linux/rv.h
View File

@ -7,6 +7,9 @@
#ifndef _LINUX_RV_H
#define _LINUX_RV_H
#include <linux/types.h>
#include <linux/list.h>
#define MAX_DA_NAME_LEN 32
#ifdef CONFIG_RV
@ -98,8 +101,13 @@ struct rv_monitor {
void (*disable)(void);
void (*reset)(void);
#ifdef CONFIG_RV_REACTORS
struct rv_reactor_def *rdef;
__printf(1, 2) void (*react)(const char *msg, ...);
bool reacting;
#endif
struct list_head list;
struct rv_monitor *parent;
struct dentry *root_d;
};
bool rv_monitoring_on(void);

211
kernel/trace/rv/rv.c
View File

@ -210,9 +210,9 @@ void rv_put_task_monitor_slot(int slot)
* Monitors with a parent are nested,
* Monitors without a parent could be standalone or containers.
*/
bool rv_is_nested_monitor(struct rv_monitor_def *mdef)
bool rv_is_nested_monitor(struct rv_monitor *mon)
{
return mdef->parent != NULL;
return mon->parent != NULL;
}
/*
@ -223,16 +223,16 @@ bool rv_is_nested_monitor(struct rv_monitor_def *mdef)
* for enable()/disable(). Use this condition to find empty containers.
* Keep both conditions in case we have some non-compliant containers.
*/
bool rv_is_container_monitor(struct rv_monitor_def *mdef)
bool rv_is_container_monitor(struct rv_monitor *mon)
{
struct rv_monitor_def *next;
struct rv_monitor *next;
if (list_is_last(&mdef->list, &rv_monitors_list))
if (list_is_last(&mon->list, &rv_monitors_list))
return false;
next = list_next_entry(mdef, list);
next = list_next_entry(mon, list);
return next->parent == mdef->monitor || !mdef->monitor->enable;
return next->parent == mon || !mon->enable;
}
/*
@ -241,10 +241,10 @@ bool rv_is_container_monitor(struct rv_monitor_def *mdef)
static ssize_t monitor_enable_read_data(struct file *filp, char __user *user_buf, size_t count,
loff_t *ppos)
{
struct rv_monitor_def *mdef = filp->private_data;
struct rv_monitor *mon = filp->private_data;
const char *buff;
buff = mdef->monitor->enabled ? "1\n" : "0\n";
buff = mon->enabled ? "1\n" : "0\n";
return simple_read_from_buffer(user_buf, count, ppos, buff, strlen(buff)+1);
}
@ -252,14 +252,14 @@ static ssize_t monitor_enable_read_data(struct file *filp, char __user *user_buf
/*
* __rv_disable_monitor - disabled an enabled monitor
*/
static int __rv_disable_monitor(struct rv_monitor_def *mdef, bool sync)
static int __rv_disable_monitor(struct rv_monitor *mon, bool sync)
{
lockdep_assert_held(&rv_interface_lock);
if (mdef->monitor->enabled) {
mdef->monitor->enabled = 0;
if (mdef->monitor->disable)
mdef->monitor->disable();
if (mon->enabled) {
mon->enabled = 0;
if (mon->disable)
mon->disable();
/*
* Wait for the execution of all events to finish.
@ -273,90 +273,90 @@ static int __rv_disable_monitor(struct rv_monitor_def *mdef, bool sync)
return 0;
}
static void rv_disable_single(struct rv_monitor_def *mdef)
static void rv_disable_single(struct rv_monitor *mon)
{
__rv_disable_monitor(mdef, true);
__rv_disable_monitor(mon, true);
}
static int rv_enable_single(struct rv_monitor_def *mdef)
static int rv_enable_single(struct rv_monitor *mon)
{
int retval;
lockdep_assert_held(&rv_interface_lock);
if (mdef->monitor->enabled)
if (mon->enabled)
return 0;
retval = mdef->monitor->enable();
retval = mon->enable();
if (!retval)
mdef->monitor->enabled = 1;
mon->enabled = 1;
return retval;
}
static void rv_disable_container(struct rv_monitor_def *mdef)
static void rv_disable_container(struct rv_monitor *mon)
{
struct rv_monitor_def *p = mdef;
struct rv_monitor *p = mon;
int enabled = 0;
list_for_each_entry_continue(p, &rv_monitors_list, list) {
if (p->parent != mdef->monitor)
if (p->parent != mon)
break;
enabled += __rv_disable_monitor(p, false);
}
if (enabled)
tracepoint_synchronize_unregister();
mdef->monitor->enabled = 0;
mon->enabled = 0;
}
static int rv_enable_container(struct rv_monitor_def *mdef)
static int rv_enable_container(struct rv_monitor *mon)
{
struct rv_monitor_def *p = mdef;
struct rv_monitor *p = mon;
int retval = 0;
list_for_each_entry_continue(p, &rv_monitors_list, list) {
if (retval || p->parent != mdef->monitor)
if (retval || p->parent != mon)
break;
retval = rv_enable_single(p);
}
if (retval)
rv_disable_container(mdef);
rv_disable_container(mon);
else
mdef->monitor->enabled = 1;
mon->enabled = 1;
return retval;
}
/**
* rv_disable_monitor - disable a given runtime monitor
* @mdef: Pointer to the monitor definition structure.
* @mon: Pointer to the monitor definition structure.
*
* Returns 0 on success.
*/
int rv_disable_monitor(struct rv_monitor_def *mdef)
int rv_disable_monitor(struct rv_monitor *mon)
{
if (rv_is_container_monitor(mdef))
rv_disable_container(mdef);
if (rv_is_container_monitor(mon))
rv_disable_container(mon);
else
rv_disable_single(mdef);
rv_disable_single(mon);
return 0;
}
/**
* rv_enable_monitor - enable a given runtime monitor
* @mdef: Pointer to the monitor definition structure.
* @mon: Pointer to the monitor definition structure.
*
* Returns 0 on success, error otherwise.
*/
int rv_enable_monitor(struct rv_monitor_def *mdef)
int rv_enable_monitor(struct rv_monitor *mon)
{
int retval;
if (rv_is_container_monitor(mdef))
retval = rv_enable_container(mdef);
if (rv_is_container_monitor(mon))
retval = rv_enable_container(mon);
else
retval = rv_enable_single(mdef);
retval = rv_enable_single(mon);
return retval;
}
@ -367,7 +367,7 @@ int rv_enable_monitor(struct rv_monitor_def *mdef)
static ssize_t monitor_enable_write_data(struct file *filp, const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct rv_monitor_def *mdef = filp->private_data;
struct rv_monitor *mon = filp->private_data;
int retval;
bool val;
@ -378,9 +378,9 @@ static ssize_t monitor_enable_write_data(struct file *filp, const char __user *u
mutex_lock(&rv_interface_lock);
if (val)
retval = rv_enable_monitor(mdef);
retval = rv_enable_monitor(mon);
else
retval = rv_disable_monitor(mdef);
retval = rv_disable_monitor(mon);
mutex_unlock(&rv_interface_lock);
@ -399,12 +399,12 @@ static const struct file_operations interface_enable_fops = {
static ssize_t monitor_desc_read_data(struct file *filp, char __user *user_buf, size_t count,
loff_t *ppos)
{
struct rv_monitor_def *mdef = filp->private_data;
struct rv_monitor *mon = filp->private_data;
char buff[256];
memset(buff, 0, sizeof(buff));
snprintf(buff, sizeof(buff), "%s\n", mdef->monitor->description);
snprintf(buff, sizeof(buff), "%s\n", mon->description);
return simple_read_from_buffer(user_buf, count, ppos, buff, strlen(buff) + 1);
}
@ -419,37 +419,37 @@ static const struct file_operations interface_desc_fops = {
* the monitor dir, where the specific options of the monitor
* are exposed.
*/
static int create_monitor_dir(struct rv_monitor_def *mdef, struct rv_monitor_def *parent)
static int create_monitor_dir(struct rv_monitor *mon, struct rv_monitor *parent)
{
struct dentry *root = parent ? parent->root_d : get_monitors_root();
const char *name = mdef->monitor->name;
const char *name = mon->name;
struct dentry *tmp;
int retval;
mdef->root_d = rv_create_dir(name, root);
if (!mdef->root_d)
mon->root_d = rv_create_dir(name, root);
if (!mon->root_d)
return -ENOMEM;
tmp = rv_create_file("enable", RV_MODE_WRITE, mdef->root_d, mdef, &interface_enable_fops);
tmp = rv_create_file("enable", RV_MODE_WRITE, mon->root_d, mon, &interface_enable_fops);
if (!tmp) {
retval = -ENOMEM;
goto out_remove_root;
}
tmp = rv_create_file("desc", RV_MODE_READ, mdef->root_d, mdef, &interface_desc_fops);
tmp = rv_create_file("desc", RV_MODE_READ, mon->root_d, mon, &interface_desc_fops);
if (!tmp) {
retval = -ENOMEM;
goto out_remove_root;
}
retval = reactor_populate_monitor(mdef);
retval = reactor_populate_monitor(mon);
if (retval)
goto out_remove_root;
return 0;
out_remove_root:
rv_remove(mdef->root_d);
rv_remove(mon->root_d);
return retval;
}
@ -458,13 +458,12 @@ out_remove_root:
*/
static int monitors_show(struct seq_file *m, void *p)
{
struct rv_monitor_def *mon_def = p;
struct rv_monitor *mon = p;
if (mon_def->parent)
seq_printf(m, "%s:%s\n", mon_def->parent->name,
mon_def->monitor->name);
if (mon->parent)
seq_printf(m, "%s:%s\n", mon->parent->name, mon->name);
else
seq_printf(m, "%s\n", mon_def->monitor->name);
seq_printf(m, "%s\n", mon->name);
return 0;
}
@ -496,13 +495,13 @@ static void *available_monitors_next(struct seq_file *m, void *p, loff_t *pos)
*/
static void *enabled_monitors_next(struct seq_file *m, void *p, loff_t *pos)
{
struct rv_monitor_def *m_def = p;
struct rv_monitor *mon = p;
(*pos)++;
list_for_each_entry_continue(m_def, &rv_monitors_list, list) {
if (m_def->monitor->enabled)
return m_def;
list_for_each_entry_continue(mon, &rv_monitors_list, list) {
if (mon->enabled)
return mon;
}
return NULL;
@ -510,7 +509,7 @@ static void *enabled_monitors_next(struct seq_file *m, void *p, loff_t *pos)
static void *enabled_monitors_start(struct seq_file *m, loff_t *pos)
{
struct rv_monitor_def *m_def;
struct rv_monitor *mon;
loff_t l;
mutex_lock(&rv_interface_lock);
@ -518,15 +517,15 @@ static void *enabled_monitors_start(struct seq_file *m, loff_t *pos)
if (list_empty(&rv_monitors_list))
return NULL;
m_def = list_entry(&rv_monitors_list, struct rv_monitor_def, list);
mon = list_entry(&rv_monitors_list, struct rv_monitor, list);
for (l = 0; l <= *pos; ) {
m_def = enabled_monitors_next(m, m_def, &l);
if (!m_def)
mon = enabled_monitors_next(m, mon, &l);
if (!mon)
break;
}
return m_def;
return mon;
}
/*
@ -566,13 +565,13 @@ static const struct file_operations available_monitors_ops = {
*/
static void disable_all_monitors(void)
{
struct rv_monitor_def *mdef;
struct rv_monitor *mon;
int enabled = 0;
mutex_lock(&rv_interface_lock);
list_for_each_entry(mdef, &rv_monitors_list, list)
enabled += __rv_disable_monitor(mdef, false);
list_for_each_entry(mon, &rv_monitors_list, list)
enabled += __rv_disable_monitor(mon, false);
if (enabled) {
/*
@ -598,7 +597,7 @@ static ssize_t enabled_monitors_write(struct file *filp, const char __user *user
size_t count, loff_t *ppos)
{
char buff[MAX_RV_MONITOR_NAME_SIZE + 2];
struct rv_monitor_def *mdef;
struct rv_monitor *mon;
int retval = -EINVAL;
bool enable = true;
char *ptr, *tmp;
@ -633,17 +632,17 @@ static ssize_t enabled_monitors_write(struct file *filp, const char __user *user
if (tmp)
ptr = tmp+1;
list_for_each_entry(mdef, &rv_monitors_list, list) {
if (strcmp(ptr, mdef->monitor->name) != 0)
list_for_each_entry(mon, &rv_monitors_list, list) {
if (strcmp(ptr, mon->name) != 0)
continue;
/*
* Monitor found!
*/
if (enable)
retval = rv_enable_monitor(mdef);
retval = rv_enable_monitor(mon);
else
retval = rv_disable_monitor(mdef);
retval = rv_disable_monitor(mon);
if (!retval)
retval = count;
@ -702,11 +701,11 @@ static void turn_monitoring_off(void)
static void reset_all_monitors(void)
{
struct rv_monitor_def *mdef;
struct rv_monitor *mon;
list_for_each_entry(mdef, &rv_monitors_list, list) {
if (mdef->monitor->enabled && mdef->monitor->reset)
mdef->monitor->reset();
list_for_each_entry(mon, &rv_monitors_list, list) {
if (mon->enabled && mon->reset)
mon->reset();
}
}
@ -768,10 +767,10 @@ static const struct file_operations monitoring_on_fops = {
.read = monitoring_on_read_data,
};
static void destroy_monitor_dir(struct rv_monitor_def *mdef)
static void destroy_monitor_dir(struct rv_monitor *mon)
{
reactor_cleanup_monitor(mdef);
rv_remove(mdef->root_d);
reactor_cleanup_monitor(mon);
rv_remove(mon->root_d);
}
/**
@ -783,7 +782,7 @@ static void destroy_monitor_dir(struct rv_monitor_def *mdef)
*/
int rv_register_monitor(struct rv_monitor *monitor, struct rv_monitor *parent)
{
struct rv_monitor_def *r, *p = NULL;
struct rv_monitor *r;
int retval = 0;
if (strlen(monitor->name) >= MAX_RV_MONITOR_NAME_SIZE) {
@ -795,49 +794,31 @@ int rv_register_monitor(struct rv_monitor *monitor, struct rv_monitor *parent)
mutex_lock(&rv_interface_lock);
list_for_each_entry(r, &rv_monitors_list, list) {
if (strcmp(monitor->name, r->monitor->name) == 0) {
if (strcmp(monitor->name, r->name) == 0) {
pr_info("Monitor %s is already registered\n", monitor->name);
retval = -EEXIST;
goto out_unlock;
}
}
if (parent) {
list_for_each_entry(r, &rv_monitors_list, list) {
if (strcmp(parent->name, r->monitor->name) == 0) {
p = r;
break;
}
}
}
if (p && rv_is_nested_monitor(p)) {
if (parent && rv_is_nested_monitor(parent)) {
pr_info("Parent monitor %s is already nested, cannot nest further\n",
parent->name);
retval = -EINVAL;
goto out_unlock;
}
r = kzalloc(sizeof(struct rv_monitor_def), GFP_KERNEL);
if (!r) {
retval = -ENOMEM;
goto out_unlock;
}
monitor->parent = parent;
r->monitor = monitor;
r->parent = parent;
retval = create_monitor_dir(r, p);
if (retval) {
kfree(r);
goto out_unlock;
}
retval = create_monitor_dir(monitor, parent);
if (retval)
return retval;
/* keep children close to the parent for easier visualisation */
if (p)
list_add(&r->list, &p->list);
if (parent)
list_add(&monitor->list, &parent->list);
else
list_add_tail(&r->list, &rv_monitors_list);
list_add_tail(&monitor->list, &rv_monitors_list);
out_unlock:
mutex_unlock(&rv_interface_lock);
@ -852,17 +833,11 @@ out_unlock:
*/
int rv_unregister_monitor(struct rv_monitor *monitor)
{
struct rv_monitor_def *ptr, *next;
mutex_lock(&rv_interface_lock);
list_for_each_entry_safe(ptr, next, &rv_monitors_list, list) {
if (strcmp(monitor->name, ptr->monitor->name) == 0) {
rv_disable_monitor(ptr);
list_del(&ptr->list);
destroy_monitor_dir(ptr);
}
}
rv_disable_monitor(monitor);
list_del(&monitor->list);
destroy_monitor_dir(monitor);
mutex_unlock(&rv_interface_lock);
return 0;

27
kernel/trace/rv/rv.h
View File

@ -32,34 +32,23 @@ struct rv_reactor_def {
};
#endif
struct rv_monitor_def {
struct list_head list;
struct rv_monitor *monitor;
struct rv_monitor *parent;
struct dentry *root_d;
#ifdef CONFIG_RV_REACTORS
struct rv_reactor_def *rdef;
bool reacting;
#endif
};
struct dentry *get_monitors_root(void);
int rv_disable_monitor(struct rv_monitor_def *mdef);
int rv_enable_monitor(struct rv_monitor_def *mdef);
bool rv_is_container_monitor(struct rv_monitor_def *mdef);
bool rv_is_nested_monitor(struct rv_monitor_def *mdef);
int rv_disable_monitor(struct rv_monitor *mon);
int rv_enable_monitor(struct rv_monitor *mon);
bool rv_is_container_monitor(struct rv_monitor *mon);
bool rv_is_nested_monitor(struct rv_monitor *mon);
#ifdef CONFIG_RV_REACTORS
int reactor_populate_monitor(struct rv_monitor_def *mdef);
void reactor_cleanup_monitor(struct rv_monitor_def *mdef);
int reactor_populate_monitor(struct rv_monitor *mon);
void reactor_cleanup_monitor(struct rv_monitor *mon);
int init_rv_reactors(struct dentry *root_dir);
#else
static inline int reactor_populate_monitor(struct rv_monitor_def *mdef)
static inline int reactor_populate_monitor(struct rv_monitor *mon)
{
return 0;
}
static inline void reactor_cleanup_monitor(struct rv_monitor_def *mdef)
static inline void reactor_cleanup_monitor(struct rv_monitor *mon)
{
return;
}

62
kernel/trace/rv/rv_reactors.c
View File

@ -138,10 +138,10 @@ static const struct file_operations available_reactors_ops = {
*/
static int monitor_reactor_show(struct seq_file *m, void *p)
{
struct rv_monitor_def *mdef = m->private;
struct rv_monitor *mon = m->private;
struct rv_reactor_def *rdef = p;
if (mdef->rdef == rdef)
if (mon->rdef == rdef)
seq_printf(m, "[%s]\n", rdef->reactor->name);
else
seq_printf(m, "%s\n", rdef->reactor->name);
@ -158,41 +158,41 @@ static const struct seq_operations monitor_reactors_seq_ops = {
.show = monitor_reactor_show
};
static void monitor_swap_reactors_single(struct rv_monitor_def *mdef,
static void monitor_swap_reactors_single(struct rv_monitor *mon,
struct rv_reactor_def *rdef,
bool reacting, bool nested)
{
bool monitor_enabled;
/* nothing to do */
if (mdef->rdef == rdef)
if (mon->rdef == rdef)
return;
monitor_enabled = mdef->monitor->enabled;
monitor_enabled = mon->enabled;
if (monitor_enabled)
rv_disable_monitor(mdef);
rv_disable_monitor(mon);
/* swap reactor's usage */
mdef->rdef->counter--;
mon->rdef->counter--;
rdef->counter++;
mdef->rdef = rdef;
mdef->reacting = reacting;
mdef->monitor->react = rdef->reactor->react;
mon->rdef = rdef;
mon->reacting = reacting;
mon->react = rdef->reactor->react;
/* enable only once if iterating through a container */
if (monitor_enabled && !nested)
rv_enable_monitor(mdef);
rv_enable_monitor(mon);
}
static void monitor_swap_reactors(struct rv_monitor_def *mdef,
static void monitor_swap_reactors(struct rv_monitor *mon,
struct rv_reactor_def *rdef, bool reacting)
{
struct rv_monitor_def *p = mdef;
struct rv_monitor *p = mon;
if (rv_is_container_monitor(mdef))
if (rv_is_container_monitor(mon))
list_for_each_entry_continue(p, &rv_monitors_list, list) {
if (p->parent != mdef->monitor)
if (p->parent != mon)
break;
monitor_swap_reactors_single(p, rdef, reacting, true);
}
@ -202,7 +202,7 @@ static void monitor_swap_reactors(struct rv_monitor_def *mdef,
* All nested monitors are enabled also if they were off, we may refine
* this logic in the future.
*/
monitor_swap_reactors_single(mdef, rdef, reacting, false);
monitor_swap_reactors_single(mon, rdef, reacting, false);
}
static ssize_t
@ -210,7 +210,7 @@ monitor_reactors_write(struct file *file, const char __user *user_buf,
size_t count, loff_t *ppos)
{
char buff[MAX_RV_REACTOR_NAME_SIZE + 2];
struct rv_monitor_def *mdef;
struct rv_monitor *mon;
struct rv_reactor_def *rdef;
struct seq_file *seq_f;
int retval = -EINVAL;
@ -237,7 +237,7 @@ monitor_reactors_write(struct file *file, const char __user *user_buf,
* See monitor_reactors_open()
*/
seq_f = file->private_data;
mdef = seq_f->private;
mon = seq_f->private;
mutex_lock(&rv_interface_lock);
@ -252,7 +252,7 @@ monitor_reactors_write(struct file *file, const char __user *user_buf,
else
enable = true;
monitor_swap_reactors(mdef, rdef, enable);
monitor_swap_reactors(mon, rdef, enable);
retval = count;
break;
@ -268,7 +268,7 @@ monitor_reactors_write(struct file *file, const char __user *user_buf,
*/
static int monitor_reactors_open(struct inode *inode, struct file *file)
{
struct rv_monitor_def *mdef = inode->i_private;
struct rv_monitor *mon = inode->i_private;
struct seq_file *seq_f;
int ret;
@ -284,7 +284,7 @@ static int monitor_reactors_open(struct inode *inode, struct file *file)
/*
* Copy the create file "private" data to the seq_file private data.
*/
seq_f->private = mdef;
seq_f->private = mon;
return 0;
};
@ -454,37 +454,37 @@ static const struct file_operations reacting_on_fops = {
/**
* reactor_populate_monitor - creates per monitor reactors file
* @mdef: monitor's definition.
* @mon: The monitor.
*
* Returns 0 if successful, error otherwise.
*/
int reactor_populate_monitor(struct rv_monitor_def *mdef)
int reactor_populate_monitor(struct rv_monitor *mon)
{
struct dentry *tmp;
tmp = rv_create_file("reactors", RV_MODE_WRITE, mdef->root_d, mdef, &monitor_reactors_ops);
tmp = rv_create_file("reactors", RV_MODE_WRITE, mon->root_d, mon, &monitor_reactors_ops);
if (!tmp)
return -ENOMEM;
/*
* Configure as the rv_nop reactor.
*/
mdef->rdef = get_reactor_rdef_by_name("nop");
mdef->rdef->counter++;
mdef->reacting = false;
mon->rdef = get_reactor_rdef_by_name("nop");
mon->rdef->counter++;
mon->reacting = false;
return 0;
}
/**
* reactor_cleanup_monitor - cleanup a monitor reference
* @mdef: monitor's definition.
* @mon: the monitor.
*/
void reactor_cleanup_monitor(struct rv_monitor_def *mdef)
void reactor_cleanup_monitor(struct rv_monitor *mon)
{
lockdep_assert_held(&rv_interface_lock);
mdef->rdef->counter--;
WARN_ON_ONCE(mdef->rdef->counter < 0);
mon->rdef->counter--;
WARN_ON_ONCE(mon->rdef->counter < 0);
}
/*