linux-kernel - Re: [PATCH v1 08/31] x86/resctrl: Move resctrl types to a separate header

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Date: Mon, 15 Apr 2024 11:03:05 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Dave Martin <Dave.Martin@....com>
CC: James Morse <james.morse@....com>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>, Fenghua Yu <fenghua.yu@...el.com>, "Thomas
 Gleixner" <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "Borislav
 Petkov" <bp@...en8.de>, H Peter Anvin <hpa@...or.com>, Babu Moger
	<Babu.Moger@....com>, <shameerali.kolothum.thodi@...wei.com>, "D Scott
 Phillips OS" <scott@...amperecomputing.com>, <carl@...amperecomputing.com>,
	<lcherian@...vell.com>, <bobo.shaobowang@...wei.com>,
	<tan.shaopeng@...itsu.com>, <baolin.wang@...ux.alibaba.com>, Jamie Iles
	<quic_jiles@...cinc.com>, Xin Hao <xhao@...ux.alibaba.com>,
	<peternewman@...gle.com>, <dfustini@...libre.com>, <amitsinght@...vell.com>,
	David Hildenbrand <david@...hat.com>, Rex Nie <rex.nie@...uarmicro.com>
Subject: Re: [PATCH v1 08/31] x86/resctrl: Move resctrl types to a separate
 header

Hi Dave,

On 4/12/2024 9:17 AM, Dave Martin wrote:
> On Mon, Apr 08, 2024 at 08:18:00PM -0700, Reinette Chatre wrote:
>> On 3/21/2024 9:50 AM, James Morse wrote:
>>> To avoid sticky problems in the mpam glue code, move the resctrl
>>> enums into a separate header.
>>
>> Could you please elaborate so that "sticky problems in the mpam glue code" is
>> specific about what problems are avoided?
> 
> Maybe just delete the the sticky clause, and leave:
> 
> 	Move the resctrl enums into a separate header.
> 
> ...since the next paragraph explains the rationale?

In the x86 area changelogs start with a context paragraph to
provide reader with foundation to parse the subsequent problem and
solution statements (that are also expected to be in separate
paragraphs in that order). 

>>> This lets the arch code declare prototypes that use these enums without
>>> creating a loop via asm<->linux resctrl.h The same logic applies to the
>>> monitor-configuration defines, move these too.
>>>
>>> The maintainers entry for these headers was missed when resctrl.h
>>> was created. Add a wildcard entry to match both resctrl.h and
>>> resctrl_types.h.
>>>
>>> Signed-off-by: James Morse <james.morse@....com>
>>
>> ..
>>
>>> diff --git a/include/linux/resctrl_types.h b/include/linux/resctrl_types.h
>>> new file mode 100644
>>> index 000000000000..4788bd95dac6
>>> --- /dev/null
>>> +++ b/include/linux/resctrl_types.h
>>> @@ -0,0 +1,68 @@
>>> +/* SPDX-License-Identifier: GPL-2.0 */
>>> +/*
>>> + * Copyright (C) 2024 Arm Ltd.
>>> + * Based on arch/x86/kernel/cpu/resctrl/internal.h
>>> + */
>>
>> Could this header please explain how this file is intended to be used?
>> What is it intended to contain?
>>
>> Reinette
> 
> Maybe something like the following?
> 
>  * Resctrl types and constants needed for inline function definitions in
>  * the arch-specific <asm/resctrl.h> headers.
> 

ok.

Reinette