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Subjectkprobe pre_handler change return IP
Date
I use kprobe to probe a function suppose: 
int is_winter(int num) { ... }
int replace_is_winter(int num) { ...}
I want to replace is_winter() with replace_is_winter(), so when we call is_winter, replace_is_winter will be called.

so:
int my_pre_handler(struct kprobe *p, struct pt_regs *regs)
{
regs->ip = (unsigned long)&replace_is_winter;
return 1;
}

and echo 0 > /proc/sys/debug/kprobes-optimization so that jump instruction will not be used.

I got a exception in fault_handler, and trap number is 14.

fault_handler: p->addr = 0xffffffffa08e201a, ip = ffffffff8021c59d, trap #14n

Anyone here can help me ?
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