// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/module.h>
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#include <linux/sched.h> /* for wake_up_process() */
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#include <linux/ftrace.h>
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extern void my_direct_func(struct task_struct *p);
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void my_direct_func(struct task_struct *p)
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{
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trace_printk("waking up %s-%d\n", p->comm, p->pid);
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}
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extern void my_tramp(void *);
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asm (
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" .pushsection .text, \"ax\", @progbits\n"
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" .type my_tramp, @function\n"
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" .globl my_tramp\n"
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" my_tramp:"
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" pushq %rbp\n"
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" movq %rsp, %rbp\n"
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" pushq %rdi\n"
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" call my_direct_func\n"
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" popq %rdi\n"
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" leave\n"
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ASM_RET
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" .size my_tramp, .-my_tramp\n"
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" .popsection\n"
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);
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static int __init ftrace_direct_init(void)
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{
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return register_ftrace_direct((unsigned long)wake_up_process,
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(unsigned long)my_tramp);
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}
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static void __exit ftrace_direct_exit(void)
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{
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unregister_ftrace_direct((unsigned long)wake_up_process,
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(unsigned long)my_tramp);
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}
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module_init(ftrace_direct_init);
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module_exit(ftrace_direct_exit);
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MODULE_AUTHOR("Steven Rostedt");
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MODULE_DESCRIPTION("Example use case of using register_ftrace_direct()");
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MODULE_LICENSE("GPL");
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