forked from luck/tmp_suning_uos_patched
760f8bc7c8
There is a spelling mistake in a trace_printk message. As well as in the selftests that search for this string. Link: http://lkml.kernel.org/r/20191115085938.38947-1-colin.king@canonical.com Link: http://lkml.kernel.org/r/20191115090356.39572-1-colin.king@canonical.com Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
46 lines
963 B
C
46 lines
963 B
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/sched.h> /* for wake_up_process() */
|
|
#include <linux/ftrace.h>
|
|
|
|
void my_direct_func(struct task_struct *p)
|
|
{
|
|
trace_printk("waking up %s-%d\n", p->comm, p->pid);
|
|
}
|
|
|
|
extern void my_tramp(void *);
|
|
|
|
asm (
|
|
" .pushsection .text, \"ax\", @progbits\n"
|
|
" my_tramp:"
|
|
" pushq %rbp\n"
|
|
" movq %rsp, %rbp\n"
|
|
" pushq %rdi\n"
|
|
" call my_direct_func\n"
|
|
" popq %rdi\n"
|
|
" leave\n"
|
|
" ret\n"
|
|
" .popsection\n"
|
|
);
|
|
|
|
|
|
static int __init ftrace_direct_init(void)
|
|
{
|
|
return register_ftrace_direct((unsigned long)wake_up_process,
|
|
(unsigned long)my_tramp);
|
|
}
|
|
|
|
static void __exit ftrace_direct_exit(void)
|
|
{
|
|
unregister_ftrace_direct((unsigned long)wake_up_process,
|
|
(unsigned long)my_tramp);
|
|
}
|
|
|
|
module_init(ftrace_direct_init);
|
|
module_exit(ftrace_direct_exit);
|
|
|
|
MODULE_AUTHOR("Steven Rostedt");
|
|
MODULE_DESCRIPTION("Example use case of using register_ftrace_direct()");
|
|
MODULE_LICENSE("GPL");
|