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

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Message-ID: <2e033056-c2a0-4a91-8b4b-c5e53bdfb171@intel.com>
Date: Thu, 1 May 2025 15:06:18 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Yury Norov <yury.norov@...il.com>, James Morse <james.morse@....com>
CC: Tony Luck <tony.luck@...el.com>, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen
	<dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>, "Rasmus
 Villemoes" <linux@...musvillemoes.dk>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/4] cpumask: add missing API and simplify
 cpumask_any_housekeeping()

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?

Thank you very much for doing this work. 

Reinette