linux-kernel - Re: [PATCH v5] riscv: entry: set a0 = -ENOSYS only when syscall != -1

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Message-ID: <8fb8d780-9e42-438d-88d5-8fe1495cf4d2@gmail.com>
Date: Thu, 27 Jun 2024 17:35:34 +0800
From: Celeste Liu <coelacanthushex@...il.com>
To: Andreas Schwab <schwab@...e.de>
Cc: "Dmitry V. Levin" <ldv@...ace.io>, Palmer Dabbelt <palmer@...osinc.com>,
 Paul Walmsley <paul.walmsley@...ive.com>, Albert Ou <aou@...s.berkeley.edu>,
 Guo Ren <guoren@...nel.org>, Björn Töpel
 <bjorn@...osinc.com>, Conor Dooley <conor.dooley@...rochip.com>,
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
 David Laight <David.Laight@...LAB.COM>, Felix Yan
 <felixonmars@...hlinux.org>, Ruizhe Pan <c141028@...il.com>,
 Shiqi Zhang <shiqi@...c.iscas.ac.cn>,
 Emil Renner Berthing <emil.renner.berthing@...onical.com>,
 "Ivan A. Melnikov" <iv@...linux.org>
Subject: Re: [PATCH v5] riscv: entry: set a0 = -ENOSYS only when syscall != -1

On 2024-06-27 16:10, Andreas Schwab wrote:

> On Jun 27 2024, Celeste Liu wrote:
> 
>> suggestion and we found cast long to ulong is implementation-defined
>> behavior in C
> 
> There is nothing implementaton-defined in a long to ulong conversion.
> 

Ok, I misremembered. long to ulong is modulo arithmetic but ulong to long
is implementation-defined behavior. There is no type cast issue.