linux-kernel - Re: [PATCH v7 2/2] arch/riscv: Enable kprobes when CONFIG

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Date: Wed, 27 Mar 2024 19:00:00 +0200
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Conor Dooley" <conor@...nel.org>
Cc: <linux-riscv@...ts.infradead.org>, "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 v7 2/2] arch/riscv: Enable kprobes when CONFIG_MODULES=n

On Tue Mar 26, 2024 at 8:42 PM EET, Conor Dooley wrote:
> On Tue, Mar 26, 2024 at 03:46:16PM +0200, 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.
>
> This doesn't compile for nommu:
>   /build/tmp.3xucsBhqDV/arch/riscv/kernel/execmem.c:10:46: error: 'MODULES_VADDR' undeclared (first use in this function)
>   /build/tmp.3xucsBhqDV/arch/riscv/kernel/execmem.c:11:37: error: 'MODULES_END' undeclared (first use in this function)
>   /build/tmp.3xucsBhqDV/arch/riscv/kernel/execmem.c:14:1: error: control reaches end of non-void function [-Werror=return-type]
> Clang builds also report:
> ../arch/riscv/kernel/execmem.c:8:56: warning: omitting the parameter name in a function definition is a C2x extension [-Wc2x-extensions]
>
> > 
> > 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@profian.com/ # continuation
> > Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
> > ---
> > v5-v7:
> > - No changes.
> > v4:
> > - Include linux/execmem.h.
> > v3:
> > - Architecture independent parts have been split to separate patches.
> > - Do not change arch/riscv/kernel/module.c as it is out of scope for
> >   this patch set now.
>
> Meta comment. I dunno when v1 was sent, but versions can you please
> relax with submitting new versions of your patches? There's conversations
> ongoing on v5 at the moment, while this is a more recent version. v2
> seems to have been sent on the 23rd and there's been 5 versions in the
> last day:
> https://patchwork.kernel.org/project/linux-riscv/list/?submitter=195059&state=*
>
> Could you please also try and use a cover letter for patchsets, ideally
> with a consistent subject? Otherwise I have to manually mark stuff as
> superseded.

Point taken but the work has been taken over by Mark and relevant
changes are now sucked into that patch set.

> Thanks,
> Conor.

BR, Jarkko