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// SPDX-License-Identifier: GPL-2.0
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/once.h>
#include <linux/random.h>
#include <linux/module.h>
struct once_work {
struct work_struct work;
struct static_key_true *key;
struct module *module;
};
static void once_deferred(struct work_struct *w)
{
struct once_work *work;
work = container_of(w, struct once_work, work);
BUG_ON(!static_key_enabled(work->key));
static_branch_disable(work->key);
module_put(work->module);
kfree(work);
}
static void once_disable_jump(struct static_key_true *key, struct module *mod)
{
struct once_work *w;
w = kmalloc(sizeof(*w), GFP_ATOMIC);
if (!w)
return;
INIT_WORK(&w->work, once_deferred);
w->key = key;
w->module = mod;
__module_get(mod);
schedule_work(&w->work);
}
static DEFINE_SPINLOCK(once_lock);
bool __do_once_start(bool *done, unsigned long *flags)
__acquires(once_lock)
{
spin_lock_irqsave(&once_lock, *flags);
if (*done) {
spin_unlock_irqrestore(&once_lock, *flags);
/* Keep sparse happy by restoring an even lock count on
* this lock. In case we return here, we don't call into
* __do_once_done but return early in the DO_ONCE() macro.
*/
__acquire(once_lock);
return false;
}
return true;
}
EXPORT_SYMBOL(__do_once_start);
void __do_once_done(bool *done, struct static_key_true *once_key,
unsigned long *flags, struct module *mod)
__releases(once_lock)
{
*done = true;
spin_unlock_irqrestore(&once_lock, *flags);
once_disable_jump(once_key, mod);
}
EXPORT_SYMBOL(__do_once_done);
static DEFINE_MUTEX(once_mutex);
bool __do_once_sleepable_start(bool *done)
__acquires(once_mutex)
{
mutex_lock(&once_mutex);
if (*done) {
mutex_unlock(&once_mutex);
/* Keep sparse happy by restoring an even lock count on
* this mutex. In case we return here, we don't call into
* __do_once_done but return early in the DO_ONCE_SLEEPABLE() macro.
*/
__acquire(once_mutex);
return false;
}
return true;
}
EXPORT_SYMBOL(__do_once_sleepable_start);
void __do_once_sleepable_done(bool *done, struct static_key_true *once_key,
struct module *mod)
__releases(once_mutex)
{
*done = true;
mutex_unlock(&once_mutex);
once_disable_jump(once_key, mod);
}
EXPORT_SYMBOL(__do_once_sleepable_done);
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