linux-kernel - Re: [PATCH v2 0/4] cpumask: add missing API and simplify cpumask_any

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Message-ID: <dccc8512-750d-4806-9c56-acbe9e3340a6@intel.com>
Date: Fri, 2 May 2025 09:17:42 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Yury Norov <yury.norov@...il.com>, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen
	<dave.hansen@...ux.intel.com>, <x86@...nel.org>
CC: James Morse <james.morse@....com>, Tony Luck <tony.luck@...el.com>,
	"Rasmus Villemoes" <linux@...musvillemoes.dk>, "H. Peter Anvin"
	<hpa@...or.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/4] cpumask: add missing API and simplify
 cpumask_any_housekeeping()

Dear x86 Maintainers,

On 5/2/25 8:32 AM, Yury Norov wrote:
> On Thu, May 01, 2025 at 03:06:18PM -0700, Reinette Chatre wrote:
>> Hi Yury,
>>
>> On 4/27/25 11:52 AM, Yury Norov wrote:
>>> From: Yury Norov [NVIDIA] <yury.norov@...il.com>
>>>
>>> cpumask library missed some flavors of cpumask_any_but(), which makes
>>> users to workaround it by using less efficient cpumask_nth() functions
>>>
>>> This series adds missing cpumask_any_andnot_but() and makes
>>> cpumask_any_but() understanding the RESCTRL_PICK_ANY_CPU hint.
>>> This simplifies cpumask_any_housekeeping() significantly.
>>>
>>> v1: https://lore.kernel.org/all/20250407153856.133093-1-yury.norov@gmail.com/
>>> v2:
>>>  - switch cpumask_any_but() functions to signed type for CPU (Reinette);
>>>  - change name for the new function to cpumask_any_andnot_but() (James);
>>>  - drop O(n*log(n)) comment. cpumask_nth() is slower, but still linear.
>>>
>>> Yury Norov [NVIDIA] (4):
>>>   cpumask: relax cpumask_any_but()
>>>   find: add find_first_andnot_bit()
>>>   cpumask: add cpumask_{first,next}_andnot() API
>>>   x86/resctrl: optimize cpumask_any_housekeeping()
>>
>> Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
>>
>> Does anything in your "bitmap-for-next" branch depend on this
>> series? If not, would you be ok if this series goes upstream
>> via tip (pending confirmation from tip maintainers) to make
>> for smoother upstream of resctrl patches that touch the same area?
>  
> Sure, please take it with the resctrl material.
> 

Could you please consider this work for inclusion into tip's
x86/cache branch? 

Thank you very much.

Reinette