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

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Message-ID: <109afaab-05c0-4228-8ea0-1dc1aabe904f@gmail.com>
Date: Tue, 29 Oct 2024 00:25:54 +0800
From: Celeste Liu <coelacanthushex@...il.com>
To: Ron Economos <re@...z.net>, Thomas Gleixner <tglx@...utronix.de>,
 Björn Töpel <bjorn@...nel.org>,
 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>
Cc: 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 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.

> 
> Ron
>