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Re: [PATCH v2 06/39] xen/riscv: introduce fence.h
- To: Oleksii <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 7 Dec 2023 10:45:22 +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: Thu, 07 Dec 2023 09:45:27 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 07.12.2023 10:42, Oleksii wrote:
> On Tue, 2023-12-05 at 16:56 +0100, Jan Beulich wrote:
>> On 24.11.2023 11:30, Oleksii Kurochko wrote:
>>> --- /dev/null
>>> +++ b/xen/arch/riscv/include/asm/fence.h
>>> @@ -0,0 +1,12 @@
>>> +#ifndef _ASM_RISCV_FENCE_H
>>> +#define _ASM_RISCV_FENCE_H
>>> +
>>> +#ifdef CONFIG_SMP
>>> +#define RISCV_ACQUIRE_BARRIER "\tfence r , rw\n"
>>> +#define RISCV_RELEASE_BARRIER "\tfence rw, w\n"
>>> +#else
>>> +#define RISCV_ACQUIRE_BARRIER
>>> +#define RISCV_RELEASE_BARRIER
>>> +#endif
>>> +
>>> +#endif /* _ASM_RISCV_FENCE_H */
>>
>> Imo such a header would be better to introduce once a use for the
>> constructs appears. Otherwise at the very least it wants explaining
>> in the description what this is going to be needed for. I can't
>> find items of these names in other architectures so far, so this
>> must be something RISC-V-specific.
> It is going to be used only in RISC-V. The things that use these
> definitions are introduced in the patches of this patch series:
> * [PATCH v2 18/39] xen/riscv: introduce cmpxchg.h
> * [PATCH v2 17/39] xen/riscv: introduce asm/atomic.h
Then perhaps fold this patch into patch 17?
Jan
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