aboutsummaryrefslogtreecommitdiff
path: root/lib/test_debug_virtual.c
blob: b9cdeecc19dc303f0167433457f41f5325684f6a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
#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 <asm/page.h>
#ifdef CONFIG_MIPS
#include <asm/bootinfo.h>
#endif

struct foo {
	unsigned int bar;
};

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(sizeof(*foo), GFP_KERNEL);
	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");