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Date: Mon, 28 Oct 2024 15:27:03 +0000
From: Will Deacon <will@kernel.org>
To: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Florent Revest <revest@chromium.org>,
	linux-trace-kernel@vger.kernel.org,
	LKML <linux-kernel@vger.kernel.org>,
	Martin KaFai Lau <martin.lau@linux.dev>, bpf <bpf@vger.kernel.org>,
	Alexei Starovoitov <ast@kernel.org>, Jiri Olsa <jolsa@kernel.org>,
	Alan Maguire <alan.maguire@oracle.com>,
	Mark Rutland <mark.rutland@arm.com>, linux-arch@vger.kernel.org,
	Catalin Marinas <catalin.marinas@arm.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>
Subject: Re: [PATCH v18 06/17] tracing: Add ftrace_partial_regs() for
 converting ftrace_regs to pt_regs
Message-ID: <20241028152702.GD2484@willie-the-truck>
References: <172991731968.443985.4558065903004844780.stgit@devnote2>
 <172991739940.443985.12363344022031875406.stgit@devnote2>
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User-Agent: Mutt/1.10.1 (2018-07-13)

On Sat, Oct 26, 2024 at 01:36:39PM +0900, Masami Hiramatsu (Google) wrote:
> From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
> 
> Add ftrace_partial_regs() which converts the ftrace_regs to pt_regs.
> This is for the eBPF which needs this to keep the same pt_regs interface
> to access registers.
> Thus when replacing the pt_regs with ftrace_regs in fprobes (which is
> used by kprobe_multi eBPF event), this will be used.
> 
> If the architecture defines its own ftrace_regs, this copies partial
> registers to pt_regs and returns it. If not, ftrace_regs is the same as
> pt_regs and ftrace_partial_regs() will return ftrace_regs::regs.
> 
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
> Acked-by: Florent Revest <revest@chromium.org>
> Cc: Steven Rostedt <rostedt@goodmis.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: Paul Walmsley <paul.walmsley@sifive.com>
> Cc: Palmer Dabbelt <palmer@dabbelt.com>
> Cc: Albert Ou <aou@eecs.berkeley.edu>
> 
> ---
>  Changes in v18:
>   - Fix to use sizeof() for calculating array size.
>  Changes in v14:
>   - Add riscv change.
>  Changes in v8:
>   - Add the reason why this required in changelog.
>  Changes from previous series: NOTHING, just forward ported.
> ---
>  arch/arm64/include/asm/ftrace.h |   13 +++++++++++++

For the arm64 bits:

Acked-by: Will Deacon <will@kernel.org>

Will