Re: [PATCH v16 04/18] function_graph: Replace fgraph_ret_regs with ftrace_regs

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Subject: Re: [PATCH v16 04/18] function_graph: Replace fgraph_ret_regs with ftrace_regs
From: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
Date: Wed, 16 Oct 2024 08:47:20 +0900
Cc: Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Florent Revest <revest@xxxxxxxxxxxx>, linux-trace-kernel@xxxxxxxxxxxxxxx, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Martin KaFai Lau <martin.lau@xxxxxxxxx>, bpf <bpf@xxxxxxxxxxxxxxx>, Alexei Starovoitov <ast@xxxxxxxxxx>, Jiri Olsa <jolsa@xxxxxxxxxx>, Alan Maguire <alan.maguire@xxxxxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, linux-arch@xxxxxxxxxxxxxxx, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Huacai Chen <chenhuacai@xxxxxxxxxx>, WANG Xuerui <kernel@xxxxxxxxxx>, Paul Walmsley <paul.walmsley@xxxxxxxxxx>, Palmer Dabbelt <palmer@xxxxxxxxxxx>, Albert Ou <aou@xxxxxxxxxxxxxxxxx>, Vasily Gorbik <gor@xxxxxxxxxxxxx>, Alexander Gordeev <agordeev@xxxxxxxxxxxxx>, Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>, Sven Schnelle <svens@xxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>, Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
In-reply-to: <20241015183906.19678-B-hca@linux.ibm.com>

On Tue, 15 Oct 2024 20:39:06 +0200
Heiko Carstens <hca@xxxxxxxxxxxxx> wrote:

> That would make things much simpler... e.g. your new patch is also
> writing r3 to fregs, why? 

BTW, according to the document [1], r3 is for "return value 1", isn't it
used usually?

[1] https://www.kernel.org/doc/Documentation/s390/Debugging390.txt

Thanks,

-- 
Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>

Follow-Ups:
- Re: [PATCH v16 04/18] function_graph: Replace fgraph_ret_regs with ftrace_regs
  - From: Heiko Carstens

References:
- [PATCH v16 00/18] tracing: fprobe: function_graph: Multi-function graph and fprobe on fgraph
  - From: Masami Hiramatsu (Google)
- [PATCH v16 04/18] function_graph: Replace fgraph_ret_regs with ftrace_regs
  - From: Masami Hiramatsu (Google)
- Re: [PATCH v16 04/18] function_graph: Replace fgraph_ret_regs with ftrace_regs
  - From: Heiko Carstens

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