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Linux/lib/test_debug_virtual.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 #include <linux/kernel.h>
  3 #include <linux/module.h>
  4 #include <linux/export.h>
  5 #include <linux/mm.h>
  6 #include <linux/vmalloc.h>
  7 #include <linux/slab.h>
  8 #include <linux/sizes.h>
  9 #include <linux/io.h>
 10 
 11 #include <asm/page.h>
 12 #ifdef CONFIG_MIPS
 13 #include <asm/bootinfo.h>
 14 #endif
 15 
 16 struct foo {
 17         unsigned int bar;
 18 };
 19 
 20 static struct foo *foo;
 21 
 22 static int __init test_debug_virtual_init(void)
 23 {
 24         phys_addr_t pa;
 25         void *va;
 26 
 27         va = (void *)VMALLOC_START;
 28         pa = virt_to_phys(va);
 29 
 30         pr_info("PA: %pa for VA: 0x%lx\n", &pa, (unsigned long)va);
 31 
 32         foo = kzalloc(sizeof(*foo), GFP_KERNEL);
 33         if (!foo)
 34                 return -ENOMEM;
 35 
 36         pa = virt_to_phys(foo);
 37         va = foo;
 38         pr_info("PA: %pa for VA: 0x%lx\n", &pa, (unsigned long)va);
 39 
 40         return 0;
 41 }
 42 module_init(test_debug_virtual_init);
 43 
 44 static void __exit test_debug_virtual_exit(void)
 45 {
 46         kfree(foo);
 47 }
 48 module_exit(test_debug_virtual_exit);
 49 
 50 MODULE_LICENSE("GPL");
 51 MODULE_DESCRIPTION("Test module for CONFIG_DEBUG_VIRTUAL");
 52 

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