lib/test_debug_virtual.c

   1 #include <linux/kernel.h>
   2 #include <linux/module.h>
   3 #include <linux/export.h>
   4 #include <linux/mm.h>
   5 #include <linux/vmalloc.h>
   6 #include <linux/slab.h>
   7 #include <linux/sizes.h>
   8
   9 #include <asm/page.h>
  10 #ifdef CONFIG_MIPS
  11 #include <asm/bootinfo.h>
  12 #endif
  13
  14 struct foo {
  15         unsigned int bar;
  16 };
  17
  18 static struct foo *foo;
  19
  20 static int __init test_debug_virtual_init(void)
  21 {
  22         phys_addr_t pa;
  23         void *va;
  24
  25         va = (void *)VMALLOC_START;
  26         pa = virt_to_phys(va);
  27
  28         pr_info("PA: %pa for VA: 0x%lx\n", &pa, (unsigned long)va);
  29
  30         foo = kzalloc(sizeof(*foo), GFP_KERNEL);
  31         if (!foo)
  32                 return -ENOMEM;
  33
  34         pa = virt_to_phys(foo);
  35         va = foo;
  36         pr_info("PA: %pa for VA: 0x%lx\n", &pa, (unsigned long)va);
  37
  38         return 0;
  39 }
  40 module_init(test_debug_virtual_init);
  41
  42 static void __exit test_debug_virtual_exit(void)
  43 {
  44         kfree(foo);
  45 }
  46 module_exit(test_debug_virtual_exit);
  47
  48 MODULE_LICENSE("GPL");
  49 MODULE_DESCRIPTION("Test module for CONFIG_DEBUG_VIRTUAL");