[PATCH 00/17] powerpc/ftrace: refactor and add support for -fpatchable-function-entry

[Michael Ellerman]

On Mon, 19 Jun 2023 15:17:18 +0530, Naveen N Rao wrote:
> Since RFC (*):
> - Patches 1 and 17 have been included in this series due to
>   dependencies. Both had been posted out separately.
> - Patch 10 has a small change to not throw errors when checking
>   instruction sequence generated by older toolchains.
> 
> This has had more testing since and this looks good to me. Christophe
> mentioned that this results in a slowdown with ftrace [de-]activation on
> ppc32, but that isn't performance critical and we can address that
> separately.
> 
> [...]

Patch 1-16 applied to powerpc/next.

[01/17] powerpc/ftrace: Fix dropping weak symbols with older toolchains
        https://git.kernel.org/powerpc/c/f6834c8c59a8e977a6f6e4f96c5d28dfa5db8430
[02/17] powerpc/module: Remove unused .ftrace.tramp section
        https://git.kernel.org/powerpc/c/0240605931ec300ddb698020edff05a4c93edbb2
[03/17] powerpc64/ftrace: Move ELFv1 and -pg support code into a separate file
        https://git.kernel.org/powerpc/c/7f7797b372693ce17223678428490dea2b3e4389
[04/17] powerpc/ftrace: Simplify function_graph support in ftrace.c
        https://git.kernel.org/powerpc/c/96d7a13610abcf6bff9d0d0e195c6d2650310125
[05/17] powerpc/ftrace: Use FTRACE_REGS_ADDR to identify the correct ftrace trampoline
        https://git.kernel.org/powerpc/c/b5efb61c70f8ba9b1e168185530b9c7342184a4c
[06/17] powerpc/ftrace: Extend ftrace support for large kernels to ppc32
        https://git.kernel.org/powerpc/c/f3993a0330e2d11e42c095810c6c33084024df46
[07/17] powerpc/ftrace: Consolidate ftrace support into fewer files
        https://git.kernel.org/powerpc/c/bad90aa52d9a0141c41e00ccd4c40be30a29acc6
[08/17] powerpc/ftrace: Refactor ftrace_modify_code()
        https://git.kernel.org/powerpc/c/f4fcbf2e093e25a7faa8a3c2a5097524114e9547
[09/17] powerpc/ftrace: Stop re-purposing linker generated long branches for ftrace
        https://git.kernel.org/powerpc/c/33bb8a0be9c826fce545ae390ecaf91e96b5db43
[10/17] powerpc/ftrace: Add separate ftrace_init_nop() with additional validation
        https://git.kernel.org/powerpc/c/cc93b9233230312a8a905fabd590c405d60f9edd
[11/17] powerpc/ftrace: Simplify ftrace_make_nop()
        https://git.kernel.org/powerpc/c/562bde0bfc968d212d10ba6bf921a0774feebbac
[12/17] powerpc/ftrace: Simplify ftrace_make_call()
        https://git.kernel.org/powerpc/c/9365e23b15f28b7b3b333a7fc6f4c8e9464ca99f
[13/17] powerpc/ftrace: Simplify ftrace_modify_call()
        https://git.kernel.org/powerpc/c/67385738e3c248673668663ffb434ae4e0abf7f1
[14/17] powerpc/ftrace: Replace use of ftrace_call_replace() with ftrace_create_branch_inst()
        https://git.kernel.org/powerpc/c/a26ce4272eea2b20d4f39b9d7e56daf0c77151d8
[15/17] powerpc/ftrace: Implement ftrace_replace_code()
        https://git.kernel.org/powerpc/c/c91c5a828685563c24ab8879d8386de356d9085a
[16/17] powerpc/ftrace: Add support for -fpatchable-function-entry
        https://git.kernel.org/powerpc/c/0f71dcfb4aef6043da6cc509e7a7f6a3ae87c12d

cheers