linux-kernel - Re: [PATCH v19 13/19] fprobe: Add fprobe

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Message-ID: <20241110171638.6661-E-hca@linux.ibm.com>
Date: Sun, 10 Nov 2024 18:16:38 +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,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
        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>, Arnd Bergmann <arnd@...db.de>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [PATCH v19 13/19] fprobe: Add fprobe_header encoding feature

On Mon, Nov 11, 2024 at 12:51:25AM +0900, Masami Hiramatsu (Google) wrote:
> From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> 
> Fprobe store its data structure address and size on the fgraph return stack
> by __fprobe_header. But most 64bit architecture can combine those to
> one unsigned long value because 4 MSB in the kernel address are the same.
> With this encoding, fprobe can consume less space on ret_stack.
> 
> This introduces asm/fprobe.h to define arch dependent encode/decode
> macros. Note that since fprobe depends on CONFIG_HAVE_FUNCTION_GRAPH_FREGS,
> currently only arm64, loongarch, riscv, s390 and x86 are supported.
> 
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> ---
>  arch/arm64/include/asm/Kbuild       |    1 +
>  arch/loongarch/include/asm/fprobe.h |   12 +++++++++
>  arch/riscv/include/asm/Kbuild       |    1 +
>  arch/s390/include/asm/fprobe.h      |   10 ++++++++

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