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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2018, The Linux Foundation. All rights reserved.
*/
#include <linux/kernel.h>
#include <linux/notifier.h>
#include <linux/debugfs.h>
#include <linux/fs.h>
#include <linux/init.h>
ATOMIC_NOTIFIER_HEAD(show_mem_notifier);
int show_mem_notifier_register(struct notifier_block *nb)
{
return atomic_notifier_chain_register(&show_mem_notifier, nb);
}
int show_mem_notifier_unregister(struct notifier_block *nb)
{
return atomic_notifier_chain_unregister(&show_mem_notifier, nb);
}
void show_mem_call_notifiers(void)
{
atomic_notifier_call_chain(&show_mem_notifier, 0, NULL);
}
static int show_mem_notifier_get(void *dat, u64 *val)
{
show_mem_call_notifiers();
*val = 0;
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(show_mem_notifier_debug_ops, show_mem_notifier_get,
NULL, "%llu\n");
int show_mem_notifier_debugfs_register(void)
{
debugfs_create_file("show_mem_notifier", 0664, NULL, NULL,
&show_mem_notifier_debug_ops);
return 0;
}
late_initcall(show_mem_notifier_debugfs_register);
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