linux-kernel - Re: [PATCH v19 05/19] fprobe: Use ftrace

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Message-ID: <20241110170412.6661-A-hca@linux.ibm.com>
Date: Sun, 10 Nov 2024 18:04:12 +0100
From: Heiko Carstens <hca@...ux.ibm.com>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Florent Revest <revest@...omium.org>,
        linux-trace-kernel@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>, bpf <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
        Alan Maguire <alan.maguire@...cle.com>,
        Mark Rutland <mark.rutland@....com>, linux-arch@...r.kernel.org,
        Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Song Liu <song@...nel.org>, KP Singh <kpsingh@...nel.org>,
        Matt Bobrowski <mattbobrowski@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Eduard Zingerman <eddyz87@...il.com>,
        Yonghong Song <yonghong.song@...ux.dev>,
        John Fastabend <john.fastabend@...il.com>,
        Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v19 05/19] fprobe: Use ftrace_regs in fprobe exit handler

On Mon, Nov 11, 2024 at 12:49:42AM +0900, Masami Hiramatsu (Google) wrote:
> From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> 
> Change the fprobe exit handler to use ftrace_regs structure instead of
> pt_regs. This also introduce HAVE_FTRACE_REGS_HAVING_PT_REGS which
> means the ftrace_regs is including the pt_regs so that ftrace_regs
> can provide pt_regs without memory allocation.
> Fprobe introduces a new dependency with that.
> 
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> ---
>   Changes in v16:
>    - Rename HAVE_PT_REGS_TO_FTRACE_REGS_CAST to
>      HAVE_FTRACE_REGS_HAVING_PT_REGS.
>   Changes in v3:
>    - Use ftrace_regs_get_return_value()
>   Changes from previous series: NOTHING, just forward ported.
> ---
>  arch/loongarch/Kconfig          |    1 +
>  arch/s390/Kconfig               |    1 +

Acked-by: Heiko Carstens <hca@...ux.ibm.com> # s390