linux-imx

// SPDX-License-Identifier: GPL-2.0

#include <linux/debugfs.h>

#include <linux/mm.h>

#include <linux/slab.h>

#include <linux/uaccess.h>

#include <linux/memblock.h>

#include <linux/stacktrace.h>

#include <linux/page_owner.h>

#include <linux/jump_label.h>

#include <linux/migrate.h>

#include <linux/stackdepot.h>

#include <linux/seq_file.h>

​

#include "internal.h"

​

/*

 * TODO: teach PAGE_OWNER_STACK_DEPTH (__dump_page_owner and save_stack)

 * to use off stack temporal storage

 */

#define PAGE_OWNER_STACK_DEPTH (16)

​

struct page_owner {

    unsigned short order;

    short last_migrate_reason;

    gfp_t gfp_mask;

    depot_stack_handle_t handle;

};

​

static bool page_owner_disabled = true;

DEFINE_STATIC_KEY_FALSE(page_owner_inited);

​

static depot_stack_handle_t dummy_handle;

static depot_stack_handle_t failure_handle;

static depot_stack_handle_t early_handle;

​

static void init_early_allocated_pages(void);

​

static int __init early_page_owner_param(char *buf)

{

    if (!buf)

        return -EINVAL;

​

    if (strcmp(buf, "on") == 0)

        page_owner_disabled = false;

​

    return 0;

}

early_param("page_owner", early_page_owner_param);

​

static bool need_page_owner(void)

{

    if (page_owner_disabled)

        return false;

​

    return true;

}

​

static __always_inline depot_stack_handle_t create_dummy_stack(void)

{

    unsigned long entries[4];

    struct stack_trace dummy;

​

    dummy.nr_entries = 0;