root/lib/test_debug_virtual.c
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/sizes.h>
#include <linux/io.h>

#include <asm/page.h>
#ifdef CONFIG_MIPS
#include <asm/bootinfo.h>
#endif

struct foo {
        unsigned int bar;
};

static struct foo *foo;

static int __init test_debug_virtual_init(void)
{
        phys_addr_t pa;
        void *va;

        va = (void *)VMALLOC_START;
        pa = virt_to_phys(va);

        pr_info("PA: %pa for VA: 0x%lx\n", &pa, (unsigned long)va);

        foo = kzalloc_obj(*foo);
        if (!foo)
                return -ENOMEM;

        pa = virt_to_phys(foo);
        va = foo;
        pr_info("PA: %pa for VA: 0x%lx\n", &pa, (unsigned long)va);

        return 0;
}
module_init(test_debug_virtual_init);

static void __exit test_debug_virtual_exit(void)
{
        kfree(foo);
}
module_exit(test_debug_virtual_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Test module for CONFIG_DEBUG_VIRTUAL");