[PATCH v4 RESEND] powerpc: Replace kretprobe code with rethook on powerpc

[Michael Ellerman]

Abhishek Dubey <adubey at linux.ibm.com> writes:
> This is an adaptation of commit f3a112c0c40d ("x86,rethook,kprobes:
> Replace kretprobe with rethook on x86") to powerpc.
>
> Rethook follows the existing kretprobe implementation, but separates
> it from kprobes so that it can be used by fprobe (ftrace-based
> function entry/exit probes). As such, this patch also enables fprobe
> to work on powerpc. The only other change compared to the existing
> kretprobe implementation is doing the return address fixup in
> arch_rethook_fixup_return().
>
> Reference to other archs:
> commit b57c2f124098 ("riscv: add riscv rethook implementation")
> commit 7b0a096436c2 ("LoongArch: Replace kretprobe with rethook")
>
> Note:
> =====
>
> In future, rethook will be only for kretprobe, and kretprobe
> will be replaced by fprobe.
>
> https://lore.kernel.org/all/172000134410.63468.13742222887213469474.stgit@devnote2/
>
> We will	adapt the above	implementation for powerpc once its upstream.
> Until then, we can have	this implementation of rethook to serve
> current	kretprobe usecases.
>
> Reviewed-by: Naveen Rao <naveen at kernel.org>
> Signed-off-by: Abhishek Dubey <adubey at linux.ibm.com>
> ---

Was Masami's objection to v3 resolved?

cheers