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Re: [PATCH v2 11/39] xen/riscv: introduce asm/nospec.h
- To: Oleksii <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 8 Dec 2023 11:23:18 +0100
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- Cc: Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 08 Dec 2023 10:23:23 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 08.12.2023 10:33, Oleksii wrote:
> On Thu, 2023-12-07 at 15:28 +0100, Jan Beulich wrote:
>> On 24.11.2023 11:30, Oleksii Kurochko wrote:
>>> --- /dev/null
>>> +++ b/xen/arch/riscv/include/asm/nospec.h
>>> @@ -0,0 +1,25 @@
>>> +/* SPDX-License-Identifier: GPL-2.0 */
>>> +/* Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights
>>> Reserved. */
>>> +
>>> +#ifndef _ASM_RISCV_NOSPEC_H
>>> +#define _ASM_RISCV_NOSPEC_H
>>> +
>>> +static inline bool evaluate_nospec(bool condition)
>>> +{
>>> + return condition;
>>> +}
>>> +
>>> +static inline void block_speculation(void)
>>> +{
>>> +}
>>> +
>>> +#endif /* _ASM_RISCV_NOSPEC_H */
>>
>> This being identical between Arm, PPC, and now RISC-V, wouldn't this
>> be another
>> asm-generic/ candidate? (Whether such trivial stubs are copyrightable
>> is, as
>> per earlier remarks, at least questionable to me.)
> It is a good candidate to be moved to asm-generic. Thanks for notice
> that. I'll update move this patch to generic headers patch series.
>
> I am not sure too but the copyright was presented in Arm's file and
> RISC-V's version is just a copy so I decided to leave it.
> Does any documented rule exist in which cases copyright should be and
> not?
I'm afraid there's nothing. But see how PPC has dropped the copyright,
too. Generally I'm of the opinion that purely trivial stubs aren't
sensible to put under a copyright.
Jan
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