Re: [PATCHv3] arm: ftrace: Adds support for CONFIG_DYNAMIC_FTRACE_WITH_REGS

[Russell King - ARM Linux]

On Thu, Feb 09, 2017 at 12:13:22PM -0500, Steven Rostedt wrote:
> Then came along live kernel patching, which I believe this series is
> trying to support. What is needed by pt_regs is a way to "hijack" the
> function being called to instead call the patched function. That is,
> ftrace is not being used for tracing, but in reality, being used to
> modify the running kernel. It is being used to change what function
> gets called. ftrace is just a hook for that mechanism.

So, would I be correct to assume that the only parts of pt_regs that
would be touched are those which contain arguments to the function,
and the register which would contain the return value?

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