Re: [RFC][PATCH 0/3] ftrace: Add dynamically allocated trampolines

From: Steven Rostedt
Date: Tue Jul 08 2014 - 10:24:24 EST

On Mon, 7 Jul 2014 15:22:27 +0200 (CEST)
Jiri Kosina <jkosina@xxxxxxx> wrote:

> On Fri, 4 Jul 2014, Steven Rostedt wrote:
> > Well, I guess the answer to that is what do you consider the trampoline?
> > I'm currently considering it to be the assembly code that the
> > mcount/fentry call jumps to. We only have two trampolines (three if you
> > count the function graph code that will be called directly come 3.17).
> > Those two are the normal ftrace_caller and the ftrace_regs_caller.
> BTW, on those archs that support regs saving already, is there really a
> reson not to kill ftrace_caller and keep just ftrace_regs_caller?

Consistency. Perhaps the two can be the same trampoline, which would be
trivial to implement, but I wouldn't kill one which would make the
generic code more complex.

-- Steve
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at