linux-kernel - Re: [PATCH] riscv/entry: get correct syscall number from syscall_get

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Message-ID: <CAJ+HfNj4d8_Ow1GyA3uX+2f79V8173e9RWfcX6_KjTPfinZCiw@mail.gmail.com>
Date: Mon, 28 Oct 2024 20:33:50 +0100
From: Björn Töpel <bjorn@...nel.org>
To: Celeste Liu <coelacanthushex@...il.com>
Cc: Ron Economos <re@...z.net>, Thomas Gleixner <tglx@...utronix.de>, 
	Celeste Liu via B4 Relay <devnull+CoelacanthusHex.gmail.com@...nel.org>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Björn Töpel <bjorn@...osinc.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Palmer Dabbelt <palmer@...osinc.com>, 
	Alexandre Ghiti <alex@...ti.fr>, "Dmitry V. Levin" <ldv@...ace.io>, Andrea Bolognani <abologna@...hat.com>, 
	Felix Yan <felixonmars@...hlinux.org>, Ruizhe Pan <c141028@...il.com>, 
	Shiqi Zhang <shiqi@...c.iscas.ac.cn>, Guo Ren <guoren@...nel.org>, Yao Zi <ziyao@...root.org>, 
	Han Gao <gaohan@...as.ac.cn>, linux-riscv@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] riscv/entry: get correct syscall number from syscall_get_nr()

On Mon, 28 Oct 2024 at 17:26, Celeste Liu <coelacanthushex@...il.com> wrote:
>
>
> On 2024-10-28 08:17, Ron Economos wrote:
> > On 10/27/24 2:52 PM, Thomas Gleixner wrote:
> >> On Mon, Oct 28 2024 at 01:01, Celeste Liu wrote:
> >>> On 2024-10-27 23:56, Thomas Gleixner wrote:
> >>>> Equivalently you need to be able to modify orig_a0 for changing arg0,
> >>>> no?
> >>> Ok.
> >>>
> >>> Greg, could you accept a backport a new API parameter for
> >>> PTRACE_GETREGSET/PTRACE_SETREGSET to 4.19 LTS branch?
> >> Fix the problem properly and put a proper Fixes tag on it and worry
> >> about the backport later.
> >>
> >> Thanks,
> >>
> >>          tglx
> >>
> > I wouldn't worry about backporting to the 4.19 kernel. It's essentially prehistoric for RISC-V. There's no device tree support for any hardware. Also, 4.19 will be going EOL very soon (December 2024).
>
> Ok, I will work on preparing a new patch to add a new set in
> PTRACE_GETREGSET/PTRACE_SETREGSET.

Thanks for working/finding working on this! Looking forward to the patch!