linux-kernel - Re: [PATCH v3 2/2] arch/riscv: Enable kprobes when CONFIG

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Message-Id: <D034FU5LXNT8.2QCBIDTQRB2S6@kernel.org>
Date: Mon, 25 Mar 2024 22:42:35 +0200
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Jarkko Sakkinen" <jarkko@...nel.org>, <linux-riscv@...ts.infradead.org>
Cc: "Paul Walmsley" <paul.walmsley@...ive.com>, "Palmer Dabbelt"
 <palmer@...belt.com>, "Albert Ou" <aou@...s.berkeley.edu>,
 <linux-kernel@...r.kernel.org>, "Luis Chamberlain" <mcgrof@...nel.org>,
 <linux-modules@...r.kernel.org>, "Naveen N . Rao"
 <naveen.n.rao@...ux.ibm.com>, "Anil S Keshavamurthy"
 <anil.s.keshavamurthy@...el.com>, "David S . Miller" <davem@...emloft.net>,
 "Masami Hiramatsu" <mhiramat@...nel.org>
Subject: Re: [PATCH v3 2/2] arch/riscv: Enable kprobes when CONFIG_MODULES=n

On Mon Mar 25, 2024 at 10:37 PM EET, Jarkko Sakkinen wrote:
> Tacing with kprobes while running a monolithic kernel is currently
> impossible due the kernel module allocator dependency.
>
> Address the issue by implementing textmem API for RISC-V.
>
> Link: https://www.sochub.fi # for power on testing new SoC's with a minimal stack
> Link: https://lore.kernel.org/all/20220608000014.3054333-1-jarkko@profiancom/ # continuation
> Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>

I think that for any use case it is best for overall good to realize it
like this. I.e. only create patch sets related to the topic that change
behavior for arch's that are in your heavy use. For me that mean x86
and RISC-V.

That is why I shrinked this from to focus into more narrow scope.

For microarch's more alien to one, it is just too easy to make sloppy
mistakes, which could cause unwanted harm. E.g. it is for best of
arch/sh that someone involved with that microarchitecture does later
on the shenanigans.

BR, Jarkko