Messages in this thread | | | Date | Thu, 21 Apr 2022 13:06:48 -0400 | From | Steven Rostedt <> | Subject | Re: [RFC PATCH -next v2 3/4] arm64/ftrace: support dynamically allocated trampolines |
| |
On Thu, 21 Apr 2022 17:27:40 +0100 Mark Rutland <mark.rutland@arm.com> wrote:
> We can initialize the ops pointer to a default ops that does the whole > __do_for_each_ftrace_ops() dance.
OK, I think I understand now. What you are doing is instead of creating a trampoline that has all the information in the trampoline, you add nops to all the functions where you can place the information in the nops (before the function), and then have the trampoline just read that information to find the ops pointer as well as the function to call.
I guess you could have two trampolines as well. One that always calls the list loop, and one that calls the data stored in front of the function that was just called the trampoline. As it is always safe to call the loop function, you could have the call call that trampoline first, set up the specific data before the function, then call the trampoline that will read it. And same thing for tear down.
-- Steve
| |