Re: [PATCH v17 02/16] function_graph: Replace fgraph_ret_regs with ftrace_regs

[Will Deacon]

On Wed, Oct 16, 2024 at 09:58:09AM +0900, Masami Hiramatsu (Google) wrote:
> From: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
> 
> Use ftrace_regs instead of fgraph_ret_regs for tracing return value
> on function_graph tracer because of simplifying the callback interface.
> 
> The CONFIG_HAVE_FUNCTION_GRAPH_RETVAL is also replaced by
> CONFIG_HAVE_FUNCTION_GRAPH_FREGS.
> 
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
> Acked-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
> Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: Huacai Chen <chenhuacai@xxxxxxxxxx>
> Cc: WANG Xuerui <kernel@xxxxxxxxxx>
> Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx>
> Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>
> Cc: Albert Ou <aou@xxxxxxxxxxxxxxxxx>
> Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
> Cc: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
> Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
> Cc: Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>
> Cc: Sven Schnelle <svens@xxxxxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: Borislav Petkov <bp@xxxxxxxxx>
> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
> Cc: x86@xxxxxxxxxx
> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
> Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
> 
> ---
>  Changes in v17:
>   - Fixes s390 return_to_handler according to Heiko's advice.
>  Changes in v16:
>   - According to the recent ftrace_regs.h change, override
>     ftrace_regs_get_frame_pointer() if needed.
>   - s390: keep stack_frame on stack, just replace fgraph_ret_regs
>     with ftrace_regs.
>  Changes in v8:
>   - Newly added.
> ---
>  arch/arm64/Kconfig                  |    1 +
>  arch/arm64/include/asm/ftrace.h     |   23 ++++++-----------------
>  arch/arm64/kernel/asm-offsets.c     |   12 ------------
>  arch/arm64/kernel/entry-ftrace.S    |   32 ++++++++++++++++++--------------

For the arm64 parts:

Acked-by: Will Deacon <will@xxxxxxxxxx>

Will