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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - samples/ftrace/ftrace-direct-too.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/module.h>
4 #include <linux/mm.h> /* for handle_mm_fault() */
5 #include <linux/ftrace.h>
7 void my_direct_func(struct vm_area_struct
*vma
,
8 unsigned long address
, unsigned int flags
)
10 trace_printk("handle mm fault vma=%p address=%lx flags=%x\n",
14 extern void my_tramp(void *);
17 " .pushsection .text, \"ax\", @progbits\n"
18 " .type my_tramp, @function\n"
26 " call my_direct_func\n"
32 " .size my_tramp, .-my_tramp\n"
37 static int __init
ftrace_direct_init(void)
39 return register_ftrace_direct((unsigned long)handle_mm_fault
,
40 (unsigned long)my_tramp
);
43 static void __exit
ftrace_direct_exit(void)
45 unregister_ftrace_direct((unsigned long)handle_mm_fault
,
46 (unsigned long)my_tramp
);
49 module_init(ftrace_direct_init
);
50 module_exit(ftrace_direct_exit
);
52 MODULE_AUTHOR("Steven Rostedt");
53 MODULE_DESCRIPTION("Another example use case of using register_ftrace_direct()");
54 MODULE_LICENSE("GPL");